ATA 71 Powerplant - Issue 6 January 2023_Compress.pdf

BOMBARDIER DHC 8-400 (PWC PW150) ATA 71 - POWERPLANT TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY B1/B2 MAINTENANCE TRAINING MANUAL Issue 6 - January 2023 Page 1 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT A non-conductive elastomer seal is bonded to the inner surface of the rear ed...

BOMBARDIER DHC 8-400 (PWC PW150) ATA 71 - POWERPLANT TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY B1/B2 MAINTENANCE TRAINING MANUAL Issue 6 - January 2023 Page 1 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT A non-conductive elastomer seal is bonded to the inner surface of the rear edge. FORWARD NACELLE COWLING The forward nacelle cowling gives aerodynamic contour to the nacelle between the propeller system and the wing. The forward nacelle cowling is part of the engine nacelle. It protects the engine, components and the Engine Mounting Structure (EMS). The cowling also gives access to components for maintenance purposes. The nacelle cowling has these subassemblies: • • • • • Forward Cowl Assembly Forward Side Door Assembly Aft Side door Assembly Lower Cowl Assembly Spine Cowl Assembly FORWARD COWL ASSEMBLY The forward cowl assembly is in two parts: • • Left cowl Right cowl The two parts are attached to each other with captive screws at the top and bottom. The full cowl is attached to the EMS and the lower cowl with captive screws. The cowl gives access to equipment in zones 4121 left nacelle and 4221 right nacelle. The accessible equipment is the: • • • Propeller back plate and brush blocks Engine front mounts Torque reaction system The cowl is made from carbon epoxy composite. A layer of copper mesh bonded to the outer surface protects against HIRF and lightning strikes. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 2 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT - FORWARD NACELLE COWLING DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 3 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT The left door has an air duct bonded to the inner skin. The duct is made from carbon epoxy. FORWARD NACELLE COWLING The right door has an inlet duct and an outlet duct which cools the DC startergenerator. FORWARD SIDE DOOR ASSEMBLY The purpose of the forward side door assembly is to provide aerodynamic smoothness, in flight and access to engine components when opened. The outlet duct is made from titanium, the inlet duct is made from carbon epoxy. The ducts are attached to the door with rivets. Bellows type seals are attached to the ducts with clips. The seals have an interface with the DC starter-generator. The left and the right forward side door assemblies give access to the equipment in zones 4123 left nacelle and 4223 right nacelle. The doors are made from carbon epoxy composite bonded around a honeycomb core. A layer of copper mesh bonded around the outer surface protects against HIRF and lightning strike. Each door incorporates: • • • Three hinges One door support strut Four door latches The hinges are attached to hinge brackets on the spine cowl with nuts, bolts and washers. The door support strut is telescopic and locks the door in the fully open position. The bottom of the strut is bolted to a fitting on the door. The top of the strut is attached to a pedestal fitting on the mid frame of the EMS by a nut and washer. The door latches are of the pin type. When the door is closed and locked, the pins engage with latch fittings on the EMS and on the lower cowl. One latch is on the forward edge, one is on the aft edge and two are on the bottom edges of the door. Each latch has an internal to the cowl cover to constrain leakage of flammable fluids. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 4 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT - LEFT FORWARD SIDE DOOR DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 5 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT FORWARD NACELLE COWLING AFT SIDE DOOR ASSEMBLIES The aft side door assemblies give access to engine components. The left and the right aft door assemblies give access to the equipment in zones 4125 left nacelle and 4225 right nacelle. When the doors are closed, they are attached to the EMS on three sides with quick release fasteners. The doors hinges are attached to the top edge of the door with rivets. The hinges are bolted to the EMS. Peripheral seals are bonded around the edges of each door. Each door has two support struts which give support to the doors when they are fully open. The struts are rigid. They are installed in fittings on the front and rear edges of each door. Each fitting is attached to the door with bolts. The bottom of the strut is bolted to a slot in the fitting. The top of the strut is attached to a pedestal fitting on the EMS. When the door is opened the struts lock the door in the fully open position. The doors are made from titanium with Z type stiffeners on the inner surface. A cover plate is attached to the bottom, front left of the door with two quick release fasteners. The cover plate is removable for compressor washing access. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 6 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT - AFT SIDE DOOR LOCATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 7 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT FORWARD NACELLE COWLING LOWER COWL ASSEMBLY The lower cowl assembly forms part of the primary structure of the nacelle. The lower cowl also directs air from the airframe intake to the engine intake and to the bypass system and to the oil cooler. The lower cowl assembly is a primary structure cowl. It gives support for the propulsion system load during flight. The cowl skin is made from carbon epoxy composite. The structure is made from titanium. The cowl contains the engine air intake, a lower intake duct and a foreign object door assembly (FOD). The FOD door assembly is also known as the intake bypass door. The duct engages with the engine upper duct through a large flanged hole in the upper surface of the cowl. The hole has an air intake seal around the inner surface of the flange. The seal is bolted to the flange. A wing inspection light is on the outboard side of each cowl. The drain mast is bolted on the left side of the cowl. An inflatable de-icer boot is bonded around the intake area. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 8 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT - LOWER COWL DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 9 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT FORWARD NACELLE COWLING LOWER COWL ASSEMBLY CONTINUED ATTACHMENT DETAILS The cowl is bolted through fittings to the bottom of the EMS. The bolts have special locking arms which can only lock when the bolts are correctly installed through the fittings. The bolts are attached to the structure with lanyards. The cowl has two hinge assemblies attached to its rear structure with bolts. When it is necessary to do maintenance, the six bolts are removed and the cowl is lowered at the front using ground support equipment. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 10 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT - LOWER COWL ATTACHMENT BOLTS DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 11 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT FORWARD NACELLE COWLING LOWER COWL ASSEMBLY CONTINUED ATTACHMENT DETAILS CONTINUED Two quick release pip pins, engaged through the hinge assemblies, give support to the rear of the cowl. To remove the cowl, disengage the pip pins. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 12 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT - LOWER COWL HINGE PINS DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 13 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT FORWARD NACELLE COWLING INTAKE BYPASS DOOR The intake bypass door opens and ejects ice which could damage the engine to atmosphere. The intake bypass FOD door assembly is located at the rear of the duct. It contains an actuator and a door. The actuator is bolted to the door and the cowl structure. The door is in the lower skin and has a hinge on the aft. The actuator opens the door and ejects ice which could damage the engine to atmosphere. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 14 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT - INTAKE BYPASS DOOR DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 15 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT FORWARD NACELLE COWLING SPINE COWL ASSEMBLY The spine cowl assembly forms part of the EMS between forward and mid frames. The spine cowl assembly is part of the engine mounting structure and is bolted to the top of the nacelle between the forward and the mid frames. The spine is titanium and has three hinges on each side. These hinges support the forward side doors. The spine also contains installation mounts for the propeller electronic controller. A heat shield assembly for the pneumatic pre-cooler is bolted to the spine. A louvre in the skin aft of the heat shield assembly is the exhaust outlet for the pneumatic system pre-cooler. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 16 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT - SPINE COWL DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 17 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT Under a counter-clockwise positive torque load, the actuators compress the hydraulic fluid into the reservoir through an orifice. ENGINE VIBRATION ISOLATION SYSTEM Fluid pressure against a piston in the reservoir is opposed by a spring. GENERAL DESCRIPTION An extension of the piston through the actuator cover indicates piston position and therefore system pressure. A high torsional stiffness is created by the trapped fluid. The Engine Vibration Isolator System (EVIS) and the Hydraulic Torque Compensation System (HTCS) work together to give a load path from the engine mount pads to the nacelle Engine Mount Structure (EMS). Each engine has three front mount pads two side and one top mounted on the Reduction Gearbox (RGB). The engine also has two aft mount pads located on the left and right sides of the Inter-compressor Case. The Hydraulic Torque Compensation System provides high torsional stiffness to react engine torque loads. It also provides low translational stiffness to minimize the transmission of vibrations. The front mount pads transmit axial, vertical and lateral loads. The front side pads transmit most of the engine torque loads. The aft mount pads transmit vertical and lateral loads and the remaining engine torque loads. The RGB also has two pads for a torsion bar type torque restraint system. These are not used in this installation. SYSTEM OPERATION The EVIS has a vibration isolator (soft isolation mount) for each engine mount pad. The HTCS incorporates: • • • • • In this condition fluid will transfer rapidly from the reservoir into the actuators through the check valve. A high transient negative torque may rotate the engine to the snubbing limit of the side isolators. At the snubbing limit the HTCS actuators will not bottom out. Under a vertical load, the HTCS acts as a hydraulic damper by transferring fluid from one actuator to the other. The magnitude of the dampening is a function of the fluid pressure drop. The system contains approximately 10 in³ (163.9 cm³) of MIL-H 5606 hydraulic fluid. The system is pre-pressurized against the reaction of the spring loaded piston in the reservoir, plus some reaction from the mounts, to 211 psig (1455 kPag). This is to avoid the possibility of cavitation during a rapid transition to negative torque. The pressure can be determined by measuring the stand-out of the indicator at the end of the reservoir. Two hydraulic actuator cylinders Hydraulic fluid reservoir Restrictor Check valve Connecting tubes The nominal pressure at take-off is 3140 psig (21650 kPag). The cylinder, reservoir and supply tubes are made of stainless steel. The HTCS is located on the forward face of the front frame. The HTCS gives the EVIS high torsional stiffness for engine torque loads. It also gives low translational stiffness to minimize the transmission of vibrations to the engine mount system. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY The system has zero torsional stiffness under a clockwise, negative, torque load. Negative torque will be reacted to by the side and rear isolators into the engine mounting structure. In the event that fire causes leakage of the hydraulic fluid, the front mounts will snub and react to the engine torque. ATA 71 - POWERPLANT Issue 6 - January 2023 Page 18 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT - HTCS SCHEMATIC TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 19 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT ENGINE VIBRATION ISOLATION SYSTEM FORWARD TOP VIBRATION ISOLATOR The forward top vibration isolator reacts to axial, lateral and vertical loads. It also gives engine restraint in the event that both aft mounts fail. The forward top vibration isolator is installed on the forward top mount pad of the engine. The isolator reacts axial, lateral and vertical loads and gives engine restraint in the event that both aft mounts fail. The isolator has a titanium bracket and two isolator plates that have elastomer pads bonded to each inner surface. The forward plate is titanium and the aft plate is aluminium. The bracket is bolted to the engine mount pad by four stainless steel bolts. A single steel bolt and core assembly, attaches the plates to the fore and aft sides of the bracket and fastens the complete assembly to the front frame. Clearance between the core and the bracket gives the snubbing envelope. In the unlikely event of fire burning out the elastomer pads and aluminium plate, the titanium bracket, front plate and stainless steel bolt and core assembly will remain in place. The mounts will snub and allow increased fore and aft motion of the engine, but the load carrying capacity will not be impaired. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 20 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT - FORWARD TOP MOUNT ASSEMBLY TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 21 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT ENGINE VIBRATION ISOLATION SYSTEM FORWARD SIDE VIBRATION ISOLATORS The forward side vibration isolators react axial, lateral and vertical loads. They are linked to the HTCS to react torque loads. The forward side vibration isolators are installed on the left and right side mount pads of the engine. They use identical hardware and can be assembled in either a left or right configuration. They react axial, lateral and vertical loads and are linked to the HTCS to react torque loads. The mounts are redundant, so that system integrity is maintained after loss of one mount. The isolator has a bracket assembly, two isolator plates and a HTCS link. The isolator plates have a single plate with two elastomer pads bonded to one side. The bracket is installed to the engine mount pad by four bolts. The HTCS link has a spherical bearing at each end, with the lower end bolted to the bracket on the engine. The upper end is bolted to the HTCS actuator on the front frame. A single bolt and core assembly attaches the isolator plates to the front and rear sides of the bracket. The bolt then passes through the front frame and is secured with a nut and cotter pin. The bracket assembly, link, core and all bolts are stainless steel. The forward isolator plate is titanium and the rear plate is aluminium. In the event of fire burning out the elastomer pads, the metallic components of the isolator will snub and still react engine loads. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 22 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT - FORWARD SIDE MOUNT ASSEMBLY TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 23 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT ENGINE VIBRATION ISOLATION SYSTEM AFT VIBRATION ISOLATORS The aft vibration isolators react vertical and lateral engine loads and a small percentage of the engine torque loads. The aft vibration isolators are installed on the left and right aft mount pads of the engine. They use identical hardware and can be assembled in right or left configuration. The isolator has an engine bracket, mid-frame bracket, two outer plates and a link. The outer plates have elastomer pads bonded to their inner faces. The engine bracket is bolted to the engine mount pad by four bolts. A single through bolt attaches spigots on the outer plates to a spherical bearing in the engine bracket. The inner surfaces of the elastomer pads, key to the faces of the midframe bracket. The mid-frame bracket attaches to the mid-frame at the top, using a spherical bearing and bolt and at the bottom, using a link, spherical bearing and a bolt. The arrangement of link and spherical bearings allows for differential expansion of the engine and structural components, without affecting load transmission. Clearance between the pad spigots and the midframe bracket gives the snubbing envelope. The engine bracket and all the bolts are made of steel. The centre bracket and isolator plates are titanium. In the event of fire burning out the elastomer pads, the metallic components of the isolator will snub, but still react engine loads. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 24 of 26 BOMBARDIER DHC 8-400 (PWC PW150) POWERPLANT - AFT SIDE MOUNT ASSEMBLY TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 25 of 26 BOMBARDIER DHC 8-400 (PWC PW150) INTENTIONALLY LEFT BLANK TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 71 - POWERPLANT Issue 6 - January 2023 Page 26 of 26