ATA 52 Doors Maintenance Training Manual (Bombardier DHC 8-400) PDF

BOMBARDIER DHC 8-400 (PWC PW150) ATA 52 - DOORS TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY B1/B2 MAINTENANCE TRAINING MANUAL Issue 6 - January 2023 Page 1 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS GENERAL DESCRIPTION The doors give access to the aircraft for the crew, passengers and...

BOMBARDIER DHC 8-400 (PWC PW150) ATA 52 - DOORS TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY B1/B2 MAINTENANCE TRAINING MANUAL Issue 6 - January 2023 Page 1 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS GENERAL DESCRIPTION The doors give access to the aircraft for the crew, passengers and maintenance/ service personnel. Emergency exits are also supplied for emergency evacuation. An internal door separates the flight and passenger compartments. The aircraft has these doors: • • • • Forward passenger door located on the front left side of the passenger compartment Aft passenger door located on the aft left side of the passenger compartment Aft baggage door located on the left aft fuselage An AC ground power door located on the inboard side of the right nacelle TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 2 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - FUSELAGE DOORS LOCATOR PAGE 1 TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 3 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS GENERAL DESCRIPTION CONTINUED The aircraft has these doors: • • • • • • • • • • Forward baggage door located on the front right side Nose compartment doors four, located on the left and right nose section Lavatory service door located on the front right side Type II/III emergency door located on the front right passenger compartment Hydraulic ground power doors one located on each nacelle Refuel/defuel service door located on the aft section of the right nacelle Aft service door located on the aft right passenger compartment Ground air conditioning door located on the lower right aft fuselage Aft fuselage access door located on the lower aft fuselage APU access door located on the lower aft fuselage TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 4 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - FUSELAGE DOORS LOCATOR PAGE 2 TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 5 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS GENERAL DESCRIPTION CONTINUED The door warning system uses the Proximity Sensor Electronic Unit (PSEU) to monitor all pressurized fuselage doors. Door status is shown on the: • • Electronic Flight Information System (EFIS) Caution and Warning Control Panel The Doors System has: • • • • • • Passenger Doors Emergency Exits Baggage Doors Service Doors Interior Doors Door Warning System TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 6 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS door to secure it against cabin pressure loads. GENERAL DESCRIPTION CONTINUED The lower emergency exit door is installed on a piano hinge at the lower edge. It is kept in the closed position by four stops on the upper edge of the door that engage with their related stop brackets on the lower edge of the upper door. The lower door opens automatically when the upper door is removed, and the lower door handle is in the GROUND position. The lower door stays closed when the lower door handle is in the WATER position. FORWARD PASSENGER DOOR The forward passenger door is hinged at the bottom and has five steps built into the inboard side of the door structure. The steps also strengthen the door. This door has an external aluminium alloy skin braced by cross beams and intercostals. Door pressurization loads are carried by ten adjustable pressure stop bolts, five on each side. The stop bolts engage with stop brackets on the door surround structure. AFT PASSENGER DOOR There is no internal handle for the aft baggage door. The door pressure seal inflates to prevent air leakage. The aft baggage door has an external, aluminium alloy skin braced by cross beams. The door warning system monitors the door status and supplies a visual indication and warning in the flight compartment. This door rotates outwards about the two hinges main and secondary. A stabilizer rod prevents the yawing movement of the door during opening and closing. Door pressurization loads are carried by 12 stops that engage with their related stop brackets on the door surround structure. In un-pressurized flight, the door is prevented from sliding upward by the cam rollers on each side of the lift/latch shaft. If one cam roller assembly fails, the remaining cam rollers prevent the door from sliding. The lift/latch shaft is secured in the closed position by both the handle lock mechanism and over-centre springs. FLIGHT COMPARTMENT ESCAPE HATCH The flight compartment escape hatch is opened by turning the handle Counterclockwise to the open position. The hatch is opened to permit depressurization or to increase airflow in the flight compartment when the aircraft is on the ground. TYPE II/III EXIT DOORS The upper emergency exit door is secured by a lock pin and three adjustable stops on each vertical edge that engage with three stop brackets installed on the sides of the TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY AFT BAGGAGE DOOR FORWARD BAGGAGE DOOR The door opens and closes with the door face parallel with the fuselage skin. This is done by two hinges (main and secondary) and a stabilizer. Proximity sensors monitor the position of the upper fixed rollers and the door handle. A red warning light comes on in the flight compartment when the door is open or unlocked. AFT SERVICE DOOR The aft service door is located on the right side of the aircraft at the rear of the passenger compartment. The aft service door is classified as a Type I emergency exit. It is a translating type secured against pressurization loads by five stops on each vertical edge that engage with five related stop brackets installed on the door surround. ATA 52 - DOORS Issue 6 - January 2023 Page 7 of 140 BOMBARDIER DHC 8-400 (PWC PW150) • • • • DOORS GENERAL DESCRIPTION CONTINUED DOOR SEAL PRESSURIZATION SYSTEM PAX for each of the passenger doors BAGGAGE for each of the baggage doors SERVICE for the aft service door EMERG EXIT for the type II emergency exit door If a fuselage door is not fully closed and locked, the DOORS system page identifies the door and shows it as a red filled rectangle. Pressurized air is supplied from the airframe de-icing system, and from the system reservoir tank when the engines or APU are not operating. When the door is fully closed and locked, it is shown only as a green empty rectangle. DOOR WARNING SYSTEM If the data from the PSEU is invalid, the DOORS system page shows a global white INVALID DATA message. The door warning system monitors the position of these fuselage doors: • • • • • • Forward Passenger Door Aft Passenger Door Type II Emergency Exit Door Forward Baggage Door Aft Baggage Door Aft Service Door The door warning system does not monitor the flight compartment emergency hatch or the flight compartment door. When any of the fuselage doors are unlocked, both the FUSELAGE DOORS WARNING light and the MASTER WARNING light flash. If a fuselage door is not fully closed and locked, the FUSELAGE DOORS warning light and the MASTER WARNING switch-light flash. Three tones also sound over the flight compartment speakers. When the MASTER WARNING switch-light is pushed, the light goes off. The FUSELAGE DOORS warning light stays on until the door is fully closed and locked. The DOORS system page on the Multi-Function Display (MFD) shows all the fuselage doors and identifies them as: TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 8 of 140 BOMBARDIER DHC 8-400 (PWC PW150) INTENTIONALLY LEFT BLANK TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 9 of 140 BOMBARDIER DHC 8-400 (PWC PW150) • • • DOORS FORWARD PASSENGER DOOR Struts Seals, Door Valve, Control-Door Seal The Forward passenger door interfaces with: GENERAL DESCRIPTION • • • The forward passenger door gives access to the passenger compartment. Door Seal Pressurization System Door Warning System Proximity Sensors The forward passenger door is located on the left side of the fuselage at the front of the passenger compartment. To open, the initial movement is inward and then upward, the second motion is rotation outward about the doors lower edge. This door has five steps on the inboard side of the door structure. Internal and external door handles permit manual opening and closing from either the inside or outside of the aircraft. There are two automatically folding handrails, one on each side of the door. The door has four tread lights controlled by a switch on the flight attendant’s control panel. Main landing gear lock pins are stored on the forward side of the door structure. An inflatable pressure seal prevents cabin air leakage past the door. The door warning system monitors door status and supplies visual indication and warning in the flight compartment. The Forward Passenger Door System has these components: • • • • • Airstair Shell, Door Mechanism, Door Lift Mechanism, Door Balance Handrail, Door TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 10 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - FORWARD PASSENGER DOOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 11 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS Operation of the internal handle to the closed position rotates the door hinge shaft, placing the door mechanism including both the actuating rod and the mechanical spring in an over centre position and locating the stop bolts behind their related stop brackets. FORWARD PASSENGER DOOR GENERAL DESCRIPTION CONTINUED Final movement of the door mechanism opens the pressurization valve and inflates the seal, and the door is fully closed and locked. The forward passenger door opens and closes manually from either the inside or outside. An internal handle is located in a recess above the forward flight attendant seat. Opening the door from the inside is accomplished by pushing the inside handle up, to lift the door from its locked position, then pushing the door outward to open it. Once the door is partly open it will fall slowly, controlled by the balance system and should be lowered under control by direct contact outside or by grasping the handrails inside. The handle force builds up and then decreases when it passes the over centre position. At the same time, the seal pressurization valve closes and releases seal pressure. The deflated seal vents any residual passenger compartment air pressure. The locked proximity switch also disconnects. Further handle travel, through the actuating rod and crank, moves the door upward and inward to clear the ten stop bolts from their stop brackets. The “closed” proximity switch disconnects as the door opens. The door is kept at the lifted position by the counterbalance system. Pushing on the handrails or pulling on the external handhold then opens the door. The rate of opening is controlled by the gas springs of the counterbalance system. If a gas spring fails, rubber bumpers on each handrail lower strut gives free fall damage protection. Closing the door from the inside is done by pulling up on the handrail handles, the motion being assisted by the counter balance system. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 12 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - FORWARD PASSENGER DOOR INTERNAL HANDLE TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 13 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS FORWARD PASSENGER DOOR GENERAL DESCRIPTION CONTINUED An external handle is located forward of the door, in a recess in the fuselage. Opening the door from the outside is accomplished by pulling the outside handle from its flush position and pulling downwards to lift the door. A flush handhold is provided in the door outer skin to enable the operator to pull the door open against the balance cable which tends to keep the door closed. The handle force builds up and then decreases when it passes the over centre position. At the same time, the seal pressurization valve closes and releases seal pressure. The deflated seal vents any residual passenger compartment air pressure. The locked proximity sensor goes to far. Further handle travel, through the actuating rod and crank, moves the door upward and inward to clear the ten stop bolts from their stop brackets. The “closed” proximity sensor goes far as the door opens. The door is kept at the lifted position by the counterbalance system. Pushing on the handrails, or pulling on the external handhold then opens the door. The rate of opening is controlled by the gas springs of the counterbalance system. If a gas spring fails, rubber bumpers on each handrail lower strut gives free fall damage protection. Closing the door from the outside is done by first lifting the handrails inboard to break the over centre lock, then manually raising and closing the door. Moving the external handle flush with the fuselage locks the door in the same way as the internal handle. During the opening and closing sequences, the gas springs dampen any tendency for high impact at both ends of the door travel. Two proximity sensors monitor the forward passenger door. One sensor is located at the top aft side of the door, to make sure that the door is closed and fully down. The other sensor, located on the fuselage structure adjacent to the pressurization valve, monitors the lift link position to make sure that the door mechanism is fully over centre and in safety. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 14 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - FORWARD PASSENGER DOOR EXTERNAL HANDLE TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 15 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS FORWARD PASSENGER DOOR GENERAL DESCRIPTION CONTINUED The internal and external handles are interconnected by a cable and chain system. A flush handhold is used to pull the door open from the outside. Handrails on each side of the stairs automatically fold during door closing and unfold during opening. On opening, the initial movement is upward and inward. The door then rotates about a hinge at the bottom of the door. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 16 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - FORWARD PASSENGER DOOR CLOSED AND LIFTED POSITIONS TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 17 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS FORWARD PASSENGER DOOR GENERAL DESCRIPTION CONTINUED Two hinge arms attach the door to a door hinge shaft installed in the fuselage below the door surround bottom sill. The door hinge shaft is connected through a crank and actuating rod to a door lift mechanism. The lift mechanism has an upper crank and a pinion assembly, and is operated by the interconnected internal and external handles. Operation of either handle rotates a gear segment to drive a pinion, rotating the door hinge shaft through a pushrod, raising or lowering the door hinges. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 18 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - FORWARD PASSENGER DOOR LIFT MECHANISM TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 19 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS FORWARD PASSENGER DOOR GENERAL DESCRIPTION CONTINUED The upper crank and pinion assembly is attached to a gas spring assembly attached to the fuselage. A spring controlled over centring trip lever and locking bar are operated by a roller on the forward side of the door. The trip lever and spring, in conjunction with the gas spring, gives a positive over centre lock of the lift mechanism when the door is either in the opened or closed position. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 20 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - FORWARD PASSENGER DOOR TRIP LEVER AND LOCKING BAR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 21 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS FORWARD PASSENGER DOOR GENERAL DESCRIPTION CONTINUED When the door is in the closed position, door pressurization loads are carried by ten adjustable stop bolts, five on each side of the door. These stop bolts engage with related stop brackets on the door surround structure. Each door stop is inclined downward, so that pressure on the door loads the door downwards towards the closed position. The geometry of the door transporting system is such that, if the door moves away from the fully closed position, cabin pressurization loading applies a downward force on the door, preventing any further movement towards the disengaged position. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 22 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - FORWARD PASSENGER DOOR STOP BOLTS TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 23 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS FORWARD PASSENGER DOOR GENERAL DESCRIPTION CONTINUED A door counterbalance system controls the rate at which the door opens and helps to close the door. The system is controlled by two balance gas springs, attached at the top to a slide block and pulley assembly and at the bottom to a fixed bracket. The fixed bracket is bolted to the counterbalance system mounting. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 24 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - FORWARD PASSENGER DOOR BALANCE SYSTEM TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 25 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - DOOR COUNTERBALANCE SYSTEM TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 26 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - DOOR COUNTERBALANCE SYSTEM TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 27 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS FORWARD PASSENGER DOOR GENERAL DESCRIPTION CONTINUED A cable assembly attached to the fixed bracket runs up and over the slide block pulley and down to wind around a balance pulley attached to the shaft assembly. The shaft assembly is bolted to the counterbalance system mounting. The slide block and pulley assembly moves up and down in a fixed guide rail, under the action of the balance gas springs when the door is opened and closed. A support pulley system on the shaft assembly is connected by a cable to a cable support attached to the forward face of the door structure. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 28 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - FORWARD PASSENGER DOOR BALANCE SYSTEM DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 29 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS FORWARD PASSENGER DOOR GENERAL DESCRIPTION CONTINUED The door is supported on each side in the open position by the upper and the lower struts which fold automatically when the door is closed. Installed in each of the lower struts is a rubber bumper to protect the structure from impact damage if one of the balance gas springs is defective. Installed in each of the upper struts is an over-travel positive stop to prevent the structure from excessive bending when people are standing on the stairs. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 30 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - FORWARD PASSENGER DOOR STRUTS TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 31 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS FORWARD PASSENGER DOOR GENERAL DESCRIPTION CONTINUED The door has an inflatable rubber seal installed on the fuselage structure around the edge of the door opening. Pressurized air to and from the seal is controlled by a pressurization valve operated by a rod assembly in the door lift mechanism. An auxiliary weather seal installed on the upper part of door cut-out seals the door when air pressure is not available. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 32 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - FORWARD PASSENGER DOOR SEAL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 33 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS AFT PASSENGER DOOR GENERAL DESCRIPTION The aft passenger door gives access to the passenger compartment, and also functions as a Type I emergency exit. The aft passenger door is located at the rear of the passenger compartment on the left side of the aircraft. It is a translating type secured against pressurization loads by six stops located on each vertical edge, that engage with twelve related stop brackets installed on the door structure. The door is unlocked by operation of a spring loaded internal or external handle. The door opens or closes with the door face parallel with the fuselage skin. Proximity sensors monitor the position of the upper fixed rollers and the door handle. The door warning system monitors door status and supplies visual indication and warning in the flight compartment. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 34 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - AFT PASSENGER DOOR LOCATION TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 35 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS AFT PASSENGER DOOR GENERAL DESCRIPTION The Aft Passenger Door System has these components: • • • • • Handle Mechanism Vent Mechanism Lift and Latch Mechanism Hinge Mechanism Door Seal The Aft passenger door interfaces with: • • Door Warning System Proximity Sensors TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 36 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - AFT PASSENGER DOOR LOCATION TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 37 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS AFT PASSENGER DOOR SYSTEM DESCRIPTION The external handle is kept in a recess in the outer skin and is connected to the same handle shaft as the internal handle. The handle can be accessed when the flap covers are pushed in. The handle is then pulled out and turned counter clockwise to open the door. The window in the door gives a wide-angle view of the area outside the aircraft. This before the door is opened. To close the door, the lock lever adjacent to the lock hook is pulled to release the open lock, and the door is brought to the closed position. At this position, the interlock mechanism is ready for disengagement. The internal handle is turned counter-clockwise to disconnect the door hold-up hook from the hold-up hook pin. The door is moved down to the closed position, and the stops align with their related stop brackets. The handle is moved outward to lock the door and operate the proximity sensor. Cabin pressurization is prevented when the vent door is not fully closed and locked. The door can also be closed by using the external handle. The main door and vent door are sealed around their periphery. The seal is inflated by cabin pressure through holes in the seal, to keep the gap around the door closed. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 38 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - AFT PASSENGER DOOR EXTERIOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 39 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS The bias spring assembly for the latch causes an over centre against the lift/latch shaft, and locks it at the closed or open position. AFT PASSENGER DOOR The over centre position and linkage from the handle mechanism gives dual locking of the lift/latch shaft. COMPONENT LOCATION AND DESCRIPTION The lift/latch shaft is installed to a cam roller assembly at both ends. HANDLE MECHANISM The internal handle operates the lift/latch shaft, and the vent door operating rod. The lower end of the internal handle is connected to the shaft of the handle mechanism. When the internal handle or external handle is pulled full travel, the handle shaft can be turned to operate the lift/latch through cranks, rods and an idler link. The external handle is kept flush with the door skin and locked in the closed position. Pulling and turning the handle turns the handle and lift/latch shafts. VENT DOOR MECHANISM When the door is opened, the lift/latch shaft turns and lets the rollers push down the guide tracks, lifting the door for outward movement. The door operation sequence is reversed when the door is closed. When the door is in the closed position, the roller centre is offset inward against the door lift-up plane, resulting in the rollers being kept in the door closing direction, against the upward movement of the door. HINGE MECHANISM The linkage from the handle transmits the handle input to the vent door mechanism. When the door handle is pulled, the vent door opens to release pressure from the cabin. The main and secondary hinge arms keep the door face parallel with the fuselage skin during door opening or closing. The stabilizer rod helps stabilize the door during opening and closing. When the door is in the closed position, the final movement to lock the internal handle or external handle closes the vent door. The vent door is spring loaded in the direction of the open position, so that it is kept open in case of fracture or disconnection of the vent door operating mechanism. The primary function of the vent door is as follows: • • To release residual cabin pressure before the door is opened To prevent pressurization loads on the door before the door is fully closed and locked LIFT AND LATCH MECHANISM The linkage from the handle to the lift/latch shaft transmits handle input to the shaft. It locks the lift/latch shaft assembly when the handles are in their locked position. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 40 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - AFT PASSENGER DOOR INTERNAL DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 41 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS The inflatable seals are located on the door surround of the passenger door and on the aft baggage door itself. The seals for the two doors have the same crosssection. When the seals are pressurized, they extend up to 1 inch and form a seal by contacting the facing structure. DOOR SEAL PRESSURIZATION SYSTEM GENERAL DESCRIPTION The door seal pressurization system seals the forward passenger and aft baggage doors to prevent loss of cabin pressure. The door seal pressurization system uses airframe de-icing air to inflate seals on the forward passenger door and the aft baggage door. The seals inflate when the door is closed and the door handle is in the closed position. The seals deflate when the door handle is moved to the open position. If the aircraft engines are not operating, the air is supplied from a pressurized reservoir tank. The tank can be serviced through a charging valve located in the wardrobe. Each seal has a fabric core wrapped in silicon material. The passenger door seal has a polyester core. The aft baggage door seal has a NOMEX core for increased fire protection. A drain valve is fitted to the system to allow depressurization and water draining of the system, for maintenance action. The reservoir can be serviced on the ground, through the charging valve located in the wardrobe. The door seal pressurization system has these components: • • • • • • Tank, Reservoir Valve, Drain Check Valve, Heated Valve, Charging Lines Valves, Control SYSTEM OPERATION The door seal pressurization system is connected to the airframe de-icing system. When the de-icing system is pressurized, air is routed through the heated check valve to pressurize the reservoir tank and the door seals. When the engines are not operating, the reservoir tank supplies the door seals with pressurized air through one outlet. A pipe connected to this outlet divides into two lines, one for each door seal. Each door seal inflates when the door handle is moved to the locked position. Air is distributed to the seal through the control valve. When the handle is moved to the unlocked position, the seal is depressurized through the control valve. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 42 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - DOOR SEAL PRESSURIZATION SYSTEM TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 43 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS Failure of the heater or failure to activate the heater is detected by the TMU and logged as a fault. DOOR SEAL PRESSURIZATION SYSTEM COMPONENT LOCATION AND DESCRIPTION RESERVOIR TANK The Reservoir Tank allows storage of air so that the door seals connected to it can be inflated without the engines running. The reservoir tank holds enough air for five door opening and closing sequences. It has a volume of 652 cubic inches (10.7 litres) when not pressurized by the de-ice system. It is located in the pressurized part of the centre fuselage under the cabin floor. DRAIN VALVE The manually operated drain valve is used to depressurize the system before maintenance on the door seal system. It is also used to drain any water that may be in the reservoir. The valve is operated from the outside of the aircraft under the fuselage. HEATED CHECK VALVE The valve allows airframe de-icing pressure to flow to the door seal system and prevents reverse flow of air, back to the de-icing system. The valve is electrically heated to prevent moisture, which may be in the de-icing air supply, from freezing inside the valve. The Timer Monitor Unit (TMU) of the de-icing system controls the heater, with inputs from Static Air Temperature sensors 1 and 2. If both SAT sensors indicate that the temperature is greater than 9°C, the heater is deactivated. The heater is activated when one SAT sensor indicates that the temperature is less than 5°C. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 44 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - DOOR SEAL PRESSURIZATION RESERVOIR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 45 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS DOOR SEAL PRESSURIZATION SYSTEM COMPONENT LOCATION AND DESCRIPTION CHARGING VALVE The manually operated charging valve allows the system to be pressurized from an external source. This allows opening and closing of the two doors without operating an engine. LINES All the components in the system are connected by the aluminium plumbing lines. CONTROL VALVES The control valves allow inflation or deflation of the passenger and aft baggage door seals. Each control valve is installed on the appropriate door frame, within the door mechanism. The control valve is a three way mechanical valve. One port is connected to the pressure line, while the second port is connected to the seal. The third port is connected to the ambient air and acts as a relief port to deflate the seal. The door handle mechanisms on the passenger and aft baggage doors operate their related control valves. When the handle is in the locked position, the seal port is connected to the pressure port and the seal is inflated. When the handle is turned to open the door, the seal port is connected to the relief port and the seal deflates. The passenger door has a push-button which activates its control valve. The aft baggage door has a roller which activates its control valve. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 46 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - DOOR SEAL PRESSURIZATION CHARGING VALVE TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 47 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS EMERGENCY EXITS GENERAL DESCRIPTION The emergency exits gives access to and from the passenger and flight compartments for emergency evacuation. There are four emergency exits located in the passenger compartment, three Type I and one Type II/III. The door warning system monitors emergency exit door status and supplies visual indication and warning in the flight compartment. There is an emergency exit located in the flight compartment roof. The three Type I exits are: • • • Forward Passenger door Aft Passenger door Aft Service door The emergency exits also include the components that follow: • • • Flight Compartment Escape Hatch Upper Forward Emergency Type II Exit Door Lower Forward Emergency Type III Exit Door TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 48 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - EMERGENCY EXITS LOCATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 49 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS EMERGENCY EXITS FORWARD AND AFT PASSENGER DOORS The forward and aft passenger doors are located on the left side of the fuselage and are also used as emergency exits. The forward passenger door opens outwards and down. The aft passenger door opens outward and forward. TYPE II/III AND AFT SERVICE DOORS The aft service door and type II/III emergency doors are located on the right side of the aircraft. The aft service door opens outward and forward. The type II/III emergency door has an upper and lower door. The upper door is a plug type door which is removed completely for opening. The lower door is hinged at the bottom, and opens outward and downward from the floor level. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 50 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - AFT SERVICE AND TYPE II/III DOOR LOCATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 51 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS EMERGENCY EXITS TYPE II/III EXIT DOORS The upper emergency exit door is secured by a lock pin and three adjustable stops on each vertical edge that engage with three stop brackets installed on the sides of the door to secure it against cabin pressure loads. The lower emergency exit door is installed on a piano hinge at the lower edge. It is kept in the closed position by four stops on the upper edge of the door that engage with their related stop brackets on the lower edge of the upper door. The lower door opens automatically when the upper door is removed, and the lower door handle is in the GROUND position. The lower door stays closed when the lower door handle is in the WATER position. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 52 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - TYPE II/III DOORS OPERATION TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 53 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS EMERGENCY EXITS COMPONENT LOCATION AND DESCRIPTION LATCH MECHANISM (UPPER DOOR) The lower end of the internal handle is connected to the handle shaft which is spring loaded to the locking direction of the lock pin. When the internal handle is pulled, the vent dish is opened and the lock pin is retracted, the upper door can now be removed. The lock pin is kept at the locked position by two independent bias springs. The internal handle has a cover to prevent the door from being accidentally opened. LATCH MECHANISM (LOWER DOOR) The lower door handle is installed with an over centre spring, to hold the handle at the engaged or disengaged position. Two shoot bolts engage to fittings on the door structure to keep the door closed. DOOR SEAL (UPPER AND LOWER DOOR) The upper and lower door seals are a passive type. Several holes in the seals let them be inflated by cabin pressure. VENT DISH SEAL (UPPER DOOR) This seal is a compression seal made of neoprene sponge and fits around the periphery of the vent dish. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 54 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - TYPE II EMERGENCY DOOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 55 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - TYPE II EMERGENCY EXIT DOORS OPEN TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 56 of 140 BOMBARDIER DHC 8-400 (PWC PW150) INTENTIONALLY LEFT BLANK TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 57 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS LATCH MECHANISM FLIGHT COMPARTMENT ESCAPE HATCH The latch mechanism controls opening and closing of the hatch. When the handle is moved to the open position, the mechanical linkage connected to the handle turns the torque tubes. The rollers then engage in detents on the structure to let the hatch door partially open. GENERAL DESCRIPTION The flight compartment escape hatch gives emergency access and ventilation to the flight compartment. DOOR SEAL The flight compartment escape hatch is located in the flight compartment roof, aft of the pilot seats. It is completely detachable, or can be partially opened to increase the airflow in the flight compartment when the aircraft is on the ground. The door seal helps to prevent pressurization leakage when the hatch is closed. The seal is installed around the edge of the hatch. The hatch is installed in the flight compartment roof by two support fittings at the rear, and is secured at the front by two locking and release arms. An operating handle, located in the centre of the hatch, is kept in an open or closed position by an over centre spring. A seal installed around the edge of the hatch prevents pressurization leakage. The flight compartment escape hatch includes the components that follow: • • Latch Mechanism Door Seal SYSTEM OPERATION The handle is turned counter-clockwise to open the hatch. The hatch is opened to permit depressurization or to increase airflow in the flight compartment when the aircraft is on the ground. The door movement is controlled by the geometry of the torque tube and rollers. The hatch pivots about the rear fittings and opens approximately 1 in (25.4 mm) at the front. A pull force on the handle of approximately 40 lbs (18.1 kgs) releases the rollers against the action of the locking and release springs, and the hatch can be removed from the flight compartment roof. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 58 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - EMERGENCY EXITS, FLIGHT COMPARTMENT ESCAPE HATCH TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 59 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS The door pressure seal inflates to prevent air leakage. BAGGAGE DOORS The aft baggage door has an external, aluminium alloy skin braced by cross beams. The door warning system monitors the door status and supplies a visual indication and warning in the flight compartment. GENERAL DESCRIPTION The baggage doors give access to the forward and aft baggage compartments. The aft baggage/cargo compartment is accessible externally, through an outward and upward opening baggage door in the left side rear fuselage. The forward baggage compartment is accessible externally through a door in the right front fuselage. The door opens inward and upward, and then translates outward and forward. The doors can be opened or closed manually by an external handle. Internal access to the forward baggage compartment is through a hinged door installed in the passenger compartment divider. The door has a key operated lock. There is no internal access to the aft baggage compartment. The aft baggage door incorporates an inflatable door seal, and the forward baggage door a passive type seal. SYSTEM OPERATION The baggage doors include the components that follow: • • Aft Baggage Door Forward Baggage Door AFT BAGGAGE DOOR The aft baggage door is located on the left side of the fuselage at the rear baggage compartment. The door opens outward and upward about an upper hinge, and is held open by a telescopic strut. An external tee handle is used to lock and unlock the door from the outside. There is no internal handle for the baggage door. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 60 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - AFT BAGGAGE DOOR OPEN TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 61 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS The latch mechanism has latch shaft and roller assemblies located at the forward and aft sides of the door. The tee handle is turned to cause the latch rollers to move along the roller guides. In the fully closed position, the latch roller is offset inward from the door movement direction. BAGGAGE DOORS AFT BAGGAGE DOOR The over centre geometry keeps the roller at that position, and against downward movement of the door. The latch shafts are kept in the closed position by both the handle mechanism and over centre springs SYSTEM OPERATION The telescopic strut keeps the door in the open position, and is used to close the door. One end of the strut is attached to a bracket on the aft baggage door, and the other end clamps to door when it is closed. The Aft Baggage Door System has the components that follow: • • • • • • • Mechanism, Handle Mechanism, Hinge Mechanism, Latch Strut Mechanism, Door Balance Seal, Door Valve, Control-Door Seal The door balance mechanism has four gas springs, triangular levers and rods, and helps to balance the door weight as the door turns about the hinge shaft. This reduces the force necessary to raise the door, and overbalances the door weight in the fully raised position. To close the aft baggage door, the telescopic strut is disengaged and pulled down. The door movement is helped by the counter balance system. When the door reaches the lowered position, the latch rollers move into the roller guides, and the handle lock mechanism is released. A door seal is installed on the door surround structure to prevent air leakage through the aft baggage door. The seal inflates with pressurized air from a reservoir tank or the de-icing system. The external handle is turned clockwise to the horizontal position to push the latch rollers down, and the door is lifted outward and upward. This disconnects the lockout hook and puts the stop bolts behind their related pressure stops, and connects the closed proximity switch. The tee handle is pushed in to connect the locked proximity switch and the pressurization valve inflates the door seal. The external handle mechanism is turned to operate both the latch shaft and roller assemblies. The mechanism also operates the movement of the linkages to the lockout hooks. The hinge mechanism is located above the aft baggage door and is attached to the fuselage by two hinge support fittings. The balance system rod assemblies are attached to the hinge. The two hinge arms are attached to the door by upper and lower links. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 62 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - AFT BAGGAGE DOOR DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 63 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS BAGGAGE DOORS AFT BAGGAGE DOOR SYSTEM OPERATION CONTINUED The external tee handle, located in a recess in the lower part of the door, locks and unlocks the door. A push button in the handle releases it from its flush stowage position. The initial movement of the door is downward and inward, with roller guides guiding the latch rollers on each end of the latch shafts. The door then turns outwards about an upper hinge at the top of the door. Two upper hinge arms attach to an upper hinge shaft installed in the fuselage above the door. Roller guides on the door surround structure guide the latch rollers as the door moves to the fully lowered position. When the door reaches the fully lowered position, lockout hooks engage in the upper hinge arms to keep the door at a constant distance from the fuselage. A handle lock prevents operation of the tee handle, and keeps the lockout hook engaged. A telescopic strut helps hold the door in the open position. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 64 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - AFT BAGGAGE DOOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 65 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS BAGGAGE DOORS AFT BAGGAGE DOOR SYSTEM OPERATION CONTINUED When the door is in the closed position, door pressurization loads are held by ten pressure stops, five on each side of the door. These stops engage with ten stop brackets on the door surround structure. The latch rollers also hold the aft baggage door and prevent vertical movement. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 66 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - AFT BAGGAGE DOOR STOPS TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 67 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS BAGGAGE DOORS AFT BAGGAGE DOOR SYSTEM OPERATION CONTINUED A balance system helps to balance the weight of the door as the door is opened. The system is controlled by four gas springs, which apply a balance force to the upper hinge shaft through levers and rod assemblies. These springs also dampen and control the rate of door movement as the door is opened or closed. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 68 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - AFT BAGGAGE DOOR BALANCE SYSTEM TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 69 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS BAGGAGE DOORS AFT BAGGAGE DOOR SYSTEM OPERATION CONTINUED The door has an inflatable rubber seal installed around the edge of it. Pressurized air is supplied to the seal and is controlled by a pressurization valve. The pressurization valve operates when the tee handle is extended or retracted. When the handle is extended, the seal deflates. When the handle is retracted, the seal inflates. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 70 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - AFT BAGGAGE DOOR SEAL AND PRESSURIZING VALVE TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 71 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS BAGGAGE DOORS AFT BAGGAGE DOOR SYSTEM OPERATION CONTINUED Two proximity sensors monitor the status of the aft baggage door. One sensor is located at the forward fixed-roller guide to monitor the open and closed positions. The other sensor, located in the door handle housing, monitors the handle retracted and extended position. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 72 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - AFT BAGGAGE DOOR ROLLER GUIDE LOCATION TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 73 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS BAGGAGE DOORS FORWARD BAGGAGE DOOR SYSTEM OPERATION The forward baggage door is located on the forward right side of the aircraft. The door is unlocked by the operation of an external tee handle. The door opens or closes with the door face parallel with the fuselage skin. This is done by two hinges main and secondary and a stabilizer. Proximity sensors monitor the position of the upper fixed rollers and the door handle. The door warning system monitors door status and causes a warning light (red) to come on in the flight compartment when the door is open or unlocked. The indications are shown in: • Door Warning System The forward baggage door system has these components: • • • • • Handle mechanism Vent mechanism Lift and latch mechanism Hinge mechanism Door seal The forward baggage door is of a translating type secured against pressurization loads by five stops located on each vertical edge that engages with five related stop brackets installed on the door structure. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 74 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - FORWARD BAGGAGE DOOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 75 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS The linkage from the handle transmits the handle input to the vent door mechanism. When the door handle is pulled, the vent door opens to release pressure from the cabin. When the door is in the closed position, the final movement to lock the handle closes the vent door. The vent door is spring-loaded in the direction of the open position, so that it is kept open in case of fracture or disconnection of the vent door operating mechanism. BAGGAGE DOORS FORWARD BAGGAGE DOOR SYSTEM OPERATION CONTINUED The door opening and retention system is operated by the external handle. The external handle is kept in a recess in the outer skin and is connected to the handle shaft. The handle can be accessed when the flap covers are pushed in. The handle is then pulled out and turned clockwise. The first pulling operation opens the vent door to release pressure in the cabin and the proximity switch opens. Further operation makes the lift/latch turn pushing the lift/latch roller down, and the door moves inwards and upwards to clear the door stops. At the uppermost lift position, the hold-up hook is connected to the hold-up hook pin of the door hinge and the door is moved outward. As the door moves outward, the interlock cam connects to a latch crank on the lift/latch shaft, to prevent accidental handle operation. When the door reaches the fully open position, the door open lock hook on the hinge arm is connected to the door open lock pin to keep the door in the open position. To close the door, the release handle adjacent to the lock hook is pulled to release the interlock mechanism. The door handle is turned counter-clockwise to disconnect the door hold-up hook from the hold-up hook pin. The door is lowered to the closed position aligning the stops behind their related stop bracket. Final inward movement of the handle locks the door and closes the proximity switch. Automatic cabin pressurization is prevented when the door is not fully closed and locked. The baggage door and vent door have seals around their periphery. The seals are inflated by cabin pressure through holes in the seals. The external handle is connected to the shaft of the handle mechanism. When the handle is pulled full travel, the handle shaft turns the lift/latch shaft through cranks, rods, and an idler link. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 76 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - FORWARD BAGGAGE DOOR DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 77 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS The door has two fixed rollers located on each side around the upper and lower parts that move in guides on the fuselage, giving the door tangential movement. BAGGAGE DOORS In pressurized flight, the door is held by the stops against pressurization and vertical loads. In un-pressurized flight, the door is kept from upward movement by the cam rollers on each side of the lift/latch shaft. If one cam roller assembly fails, the second cam roller assembly prevents the door from opening in flight. FORWARD BAGGAGE DOOR SYSTEM OPERATION CONTINUED The lift/latch shaft is secured at the closed position by means of both the handle lock mechanism and the over centre springs. The primary function of the vent door is as follows: • • To release residual cabin pressure to the atmosphere before the door is opened To prevent pressurization loads on the door before the door is fully closed and locked The linkage from the handle to the lift/latch shaft transmits handle input to the shaft, and locks the lift/latch shaft assembly when the handle is in the locked position. The bias spring assembly for the latch causes an over centre against the lift/latch shaft, and locks it at the closed or open position. The over centre position and linkage from the handle mechanism, gives dual locking of the lift/latch shaft. A cam roller assembly is installed at both ends of the lift/latch shaft. When the door is opened, the lift/latch shaft turns to let the rollers push down the guide tracks, lifting the door for outward movement. The door operation sequence is reversed at door closing. In the door closed position, the roller centre is offset inward against the door lift-up plane, resulting in the rollers being kept in the door closing direction, against the upward movement of the door. The main and secondary hinge arms keep the door face parallel with the fuselage skin when the door is opened or closed. During the travel of the door around the furthest position from the fuselage, the yawing movement of the door is suppressed by the stabilizer rod. The door seal is of the passive type. Several holes in the seal let it be inflated by cabin pressure. This type of seal is also installed on the vent door. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 78 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - FORWARD BAGGAGE DOOR DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 79 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS handle. When the door handle is pulled inwards the vent door opens to release pressure in the cabin and the proximity switch opens. When the handle is turned counter-clockwise, the lift/latch shaft pushes the lift/latch rollers down, and the door moves inwards and upwards to clear the door stops. AFT SERVICE DOOR GENERAL DESCRIPTION The aft service door gives access to the rear passenger compartment, and also functions as a Type I emergency exit. The aft service door is located on the right side of the aircraft at the rear of the passenger compartment. The aft service door is classified as a Type I emergency exit. It is a translating type secured against pressurization loads by five stops on each vertical edge that engage with five related stop brackets installed on the door surround. The proximity sensors monitors the position of the upper fixed rollers and the door handle. A red warning light comes on in the flight compartment when the door is open and unlocked. The aft service door system has the components that follow: • • • • • At the uppermost lifted position, the hold-up hook is connected to the hold-up hook pin of the door hinge, and the door is moved outward. As the door moves outward, the interlock cam connects to a latch crank on the lift/latch shaft, to prevent accidental handle operation. The door has two fixed rollers located on each side around the upper and lower parts, running in guides on the fuselage which gives tangential movement of the door. In pressurized flight, the door is held by the stops against pressurization and vertical loads. In un-pressurized flight, the door is kept from upward movement by cam rollers on each side of the lift/latch shaft. If one cam roller assembly fails, the second cam roller assembly prevents the door from opening in flight. The lift/latch shaft is secured at the closed position by means of both the handle lock mechanism and the over centre springs. Handle mechanism Vent door mechanism Lift and latch mechanism Hinge mechanism Door seal The Aft service door interfaces with: • • Door Warning System Proximity Sensors SYSTEM OPERATION The aft service door gives access to the rear passenger compartment and also function as a Type I emergency exit. The door operating and retention system is operated by the internal or external handle. The internal handle is pulled inwards and turned counter-clockwise to unlock the TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 80 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - AFT SERVICE DOOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 81 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS AFT SERVICE DOOR SYSTEM OPERATION CONTINUED The door is unlocked by operation of the spring loaded internal or external handle. The door opens or closes with the door face in parallel with the fuselage skin. This is done by two hinges main and secondary and a stabilizer. When the door reaches the fully opened position, the door open lock hook on the hinge arm is connected to the door open lock pin on the door to keep the door at its position. An interlock assembly prevents handle operation when the door is opened, preventing the hold-up hook from being unlatched. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 82 of 140 BOMBARDIER DHC 8-400 (PWC PW150) STRUCTURES - DOORS - AFT SERVICE DOOR INTERNAL VIEW TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 52 - DOORS Issue 6 - January 2023 Page 83 of 140 BOMBARDIER DHC 8-400 (PWC PW150) DOORS AFT SERVICE DOOR SYSTEM OPERATION CONTINUED The external handle is kept in a recess in the outer skin and is connected to the same handle shaft as that of the internal handle. The handle can be accessed when the flap covers are pushed in. The handle is then pulled out and turned clockwise to open the door. For safety, a window in the door gives a view of the outside before the door is opened. To close the door, the release lever adjacent to the lock hook is pulled to release the open lock, and the door is brought to the closed p