ATA 35 Oxygen - Bombardier DHC 8-400 (PWC PW150) PDF

BOMBARDIER DHC 8-400 (PWC PW150) ATA 35 - OXYGEN TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY B1/B2 MAINTENANCE TRAINING MANUAL Issue 6 - January 2023 Page 1 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS The oxygen system provides oxygen for the crew and passengers in the event of...

BOMBARDIER DHC 8-400 (PWC PW150) ATA 35 - OXYGEN TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY B1/B2 MAINTENANCE TRAINING MANUAL Issue 6 - January 2023 Page 1 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS The oxygen system provides oxygen for the crew and passengers in the event of decompression or in the presence of smoke or noxious gases. GENERAL DESCRIPTION The system provides oxygen from oxygen tanks. The oxygen is delivered through lines, outlets and masks. System indication and servicing is provided for safety and maintenance purposes. Portable oxygen and protective breathing equipment is also provided. The portable oxygen is used if fire, smoke or fumes are present. The oxygen system has these sub-systems: • • • • Crew Oxygen System Passenger Oxygen System Portable Oxygen System Protective Breathing Equipment TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 2 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - OXYGEN SYSTEMS LOCATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 3 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS BASIC DESCRIPTION CREW OXYGEN SYSTEM The crew oxygen system has: • • • Crew Oxygen Delivery System Crew Oxygen Indication And Servicing System Portable Oxygen System The system has sufficient oxygen to maintain the crew member consciousness for a descent from 25,000 to 14,000 ft (7620 to 4267 m) in 4 minutes, followed by an additional 116 minutes at 14,000 ft (4267 m). NOTE: These calculations are done on the assumption that the crew masks are selected to the NORMAL position. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 4 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - CREW OXYGEN SYSTEM LOCATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 5 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS BASIC DESCRIPTION CONTINUED PASSENGER OXYGEN SYSTEM The passenger oxygen system provides oxygen for passengers if the aircraft decompresses. Three high pressure cylinders, with three masks on each cylinder, are located in the passenger cabin. The aircraft has an adequate supply of oxygen to allow descent from 25,000 to 14,000 ft (7620 to 4267 m) in 4 minutes and hold at 14,000 ft (4267 m) for a duration of 120 minutes, while supplying oxygen to 10 percent of the passengers. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 6 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - PASSENGER OXYGEN SYSTEM LOCATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 7 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS BASIC DESCRIPTION CONTINUED PORTABLE OXYGEN SYSTEM The Portable Oxygen System protects the crew member or passenger from the effects of smoke, carbon dioxide, harmful gases and oxygen deficiency. The crew portable oxygen system has: • • Protective Breathing Equipment (PBE) Flight Attendant Portable Oxygen Bottle (optional) The Personal Breathing Equipment (PBE) unit is a self contained breathing hood that goes over the head and seals around the neck. The flight attendant portable oxygen bottle is intended for single person use. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 8 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - PORTABLE OXYGEN SYSTEM LOCATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 9 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS CREW OXYGEN SYSTEM The crew oxygen system supplies oxygen to the flight compartment for use by three crew members. GENERAL DESCRIPTION The crew oxygen system has: • • • • Three oxygen masks for the pilot, copilot and observer An oxygen cylinder assembly capacity: 39.8 cu ft (1.126 cu m) A lighted pressure gauge located on the copilot side console A pressure gauge on the oxygen cylinder The crew oxygen system has these sub-systems: • • Crew Oxygen Delivery Crew Oxygen Indication and Servicing CREW OXYGEN INDICATION AND SERVICING The flight compartment oxygen pressure gauge and the overboard discharge indicator are used to monitor the oxygen system for both safety and maintenance. The indication system indicates the amount of oxygen that is in reserve for emergency use. The system automatically bleeds off oxygen if the pressure exceeds 2750 psig (18961 kPag). This high pressure relief exhausts oxygen through an overboard discharge indicator, located on the right side of the nose section. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 10 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - CREW OXYGEN SYSTEM TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 11 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - CREW OXYGEN MINIMUM DISPATCH PRESSURE WITH TEMPERATURE CORRECTION TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 12 of 50 BOMBARDIER DHC 8-400 (PWC PW150) INTENTIONALLY LEFT BLANK TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 13 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS The crew oxygen masks are equipped with a three position control knob: • • • CREW OXYGEN SYSTEM OXYGEN DELIVERY The crew oxygen delivery system delivers oxygen to the pilot, copilot and observer. GENERAL DESCRIPTION NORM - normal oxygen diluter demand 100% - 100% oxygen demand EMER - emergency pressure oxygen. The lines and outlets are located in the flight compartment and un-pressurized lower right nose compartment. The lines and outlets enable the pilot, copilot and the observer to receive oxygen from the cylinder assembly. The lines and outlets are comprised of the two outlet valve assemblies, a low pressure hose assembly and the capillary line assembly. The crew oxygen delivery system has: • • • • • • The Oxygen Cylinder Assembly The Crew Oxygen Mask Assemblies Outlet Assemblies Low Pressure Hose Assemblies High Pressure Hose Assemblies Capillary Line The oxygen cylinder is located in the un-pressurized lower right nose compartment. The oxygen cylinder assembly is responsible for the storage and distribution of the oxygen supply to the pilot, copilot and observer. The cylinder has a capacity of 39.8 feet³ (1.126 meters³) of oxygen when it is pressurized to the rated pressure of 1850 psig (12755 kPag) at an ambient pressure of 14.7 psi (101.35 kPa) and an ambient temperature of 70°F (21.1°C). The oxygen cylinder assembly is comprised of a ON-OFF knob, charging valve, high pressure fitting assembly, pressure gauge, low pressure port and quick-disconnect adaptor, high pressure relief port, pressure regulator and a low pressure relief valve. The three crew oxygen masks are located in the flight compartment, one aft of the pilot and two aft of the copilot. The masks are the quick donning type with automatic diluter demand regulator. The masks have an operating pressure range of 60 to 95 psig (414 to 655 kPag). Each mask is equipped with a microphone and can be worn with the smoke goggles, which are also located in the flight compartment. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 14 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - CREW OXYGEN SYSTEM DELIVERY TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 15 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS This releases any pressure in the capillary line so that the flight compartment gauge shows no oxygen is available. CREW OXYGEN SYSTEM The charging valve - fill check valve - is protected by a captive dust cap. OXYGEN DELIVERY CONTINUED The standard oxygen cylinder must be removed from the aircraft for servicing. OXYGEN CYLINDER ASSEMBLY An optional cylinder assembly has a fitting to which allows recharging without removing the cylinder. The high pressure fitting assembly is a probe operated check valve and restrictor that connects to the capillary line. The oxygen cylinder assembly stores and distributes oxygen to the pilot, copilot and observer. DESCRIPTION The oxygen cylinder is located in the un-pressurized lower right nose compartment. It is attached to the outside of the nose landing gear bay side wall by steel clamps. The bottle is an aluminium, Kevlar composite cylinder which gives 39.8 cu. feet (1.126 cu. metres) of oxygen when charged to 1850 psig (12755 kPag) at 70ºF (21.1°C). A fabric curtain isolates the cylinder assembly from: • • Hydraulic components in the bay immediately aft Hydraulic tubes below An air scoop located on the left nose bay gives a flow of air through the nose compartment and exits a louvered outlet below and aft of the oxygen bottle. This ensures that any accumulation of hydraulic fumes or leaking oxygen are cleared from the nose compartment. The oxygen cylinder assembly incorporates: • • • • • • An on-off knob; charging valve High pressure fitting assembly Pressure gauge Low pressure port and quick disconnect adaptor High pressure relief port Pressure regulator low pressure relief valve The ON-OFF knob controls the flow of oxygen to the low pressure port and quick disconnect fitting. The supply vents to atmosphere when the regulator is OFF. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 16 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - CREW OXYGEN CYLINDER TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 17 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS CREW OXYGEN SYSTEM OXYGEN DELIVERY CONTINUED OXYGEN CYLINDER ASSEMBLY CONTINUED DESCRIPTION The pressure gauge registers cylinder pressure at scale readings from 0-2000 psig (0-13790) kPag. The low pressure port and quick disconnect adaptor connects the regulated oxygen supply to the flight compartment through the low pressure hose assembly. The high pressure relief port has a frangible disc that will rupture at 2750 psig (18961 kPag). This port relieves through the high pressure hose assembly and a green overboard discharge indicator. The pressure regulator supplies a maximum of 300 L/min flow@70 ± 10 psig (483 ± 69 kPag). The pressure regulator has a low pressure relief valve that opens at 95 ± 5 psig (655 ± 34 kPag). This protects the low pressure hose assembly. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 18 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - CREW OXYGEN SYSTEM TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 19 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS CREW OXYGEN SYSTEM OXYGEN DELIVERY CONTINUED CREW MASK AND REGULATOR ASSEMBLIES The Crew Mask and Regulator Assemblies provide oxygen to the pilot, copilot and observer. DESCRIPTION The pilot and copilot oxygen mask are kept in mask stowage cups attached to the bulkhead immediately above and behind the pilot and copilot seats. The observer mask is located on the right bulkhead. Each mask has an inflatable harness for quick-donning. The crew oxygen masks are equipped with an automatic diluter demand regulator controlled by a rotary knob. Each mask has a microphone with a separate audio connector. The mask supply hose has an in-line visual indicator to show if there is sufficient oxygen pressure. The indicator shows green when the oxygen supply pressure is good and red if the oxygen supply pressure is low. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 20 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - CREW OXYGEN MASK TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 21 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS CREW OXYGEN SYSTEM OXYGEN DELIVERY CONTINUED CREW MASK AND REGULATOR ASSEMBLIES CONTINUED The mask regulator control rotary knob has three positions: • • • NORM (normal oxygen diluter demand) 100% (100% oxygen demand) EMER (emergency pressure oxygen) The mask has a rubber oral/nasal face seal. The inflatable harness is normally in a contracted state. The inflation button on the side of the regulator fully inflates the harness. Releasing the inflation button deflates the harness to fit the mask to the head. The purge valve is manually operated to purge smoke from the smoke goggles. All three masks are connected to the low pressure distribution lines by individual quick disconnects. The masks will connect with any crew mask outlet in the flight compartment. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 22 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - CREW OXYGEN MASK (CONTINUED) TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 23 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS CREW OXYGEN SYSTEM OXYGEN DELIVERY CONTINUED SMOKE GOGGLES The Smoke Goggles prevent smoke from affecting the pilots vision. The masks are used with the smoke goggles. The smoke goggles are kept in pockets in each pilot and copilot side console and at the observer station. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 24 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - SMOKE GOGGLES TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 25 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS The hose and crew mask disconnects which are flare-less fittings. The tubing is held in place by cushioned clamps. CREW OXYGEN SYSTEM HIGH PRESSURE HOSE ASSEMBLY OXYGEN DELIVERY CONTINUED The high pressure hose assembly connects the high pressure relief port of the cylinder assembly to the overboard discharge indicator. The hose has an outer braid of stainless steel and is rated to 12000 psig (82737 kPag). OUTLET ASSEMBLIES The Outlet Assemblies provide a connection for the flight crew to connect the crew oxygen masks to the crew oxygen supply. CAPILLARY LINE There are two oxygen outlet valves located in the flight compartment. The capillary line connects the oxygen cylinder to the flight compartment pressure gauge. The oxygen outlet valve located aft of the pilot is a single outlet unit. The oxygen outlet valve located aft of the copilot is a dual outlet that connects the oxygen masks for the copilot and the observer. The oxygen outlet has an operating pressure of 5 to 100 psig (34.5 to 690 kPag). The outlets have captive dust covers and connect with the supply hose of the crew oxygen masks. The line is a high pressure 0.0625 inch diameter (1.59 millimetre) tube made from seamless copper alloy tubing. The capillary line is routed through the copilot side console to the flight compartment pressure gauge. The connection to the cylinder is by a coil tube. LOW PRESSURE HOSE ASSEMBLY The Low Pressure Hose Assembly connects the cylinder assembly to the stainless steel distribution tubes. The cylinder is attached to the low pressure distribution tubing by a low pressure hose with a quick disconnect connector. The hose is PVC tubing with a nomex fire retarding braid and an operating pressure of 80 psig (552 kPag). The tubing passes through the pressure bulkhead by a fitting. It then divides and is routed left and right under the flight compartment floor and then up the aft bulkhead to the mask outlets. The tubing is thin walled stainless steel. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 26 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - LINES AND OUTLETS, DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 27 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS CREW OXYGEN SYSTEM SYSTEM TESTS PRE-FLIGHT TESTING To Test The Crew Oxygen Mask Before Flight: • • • • • • Remove the mask from the stowage cup by holding the control knob Push the red harness inflation button on the regulator -the harness should inflate smoothly Release the red harness inflation button - the harness should deflate smoothly Put on the mask and breathe normally, check the NORM, 100% and EMER positions - the mask should not vibrate the pressure line indicator should show green Speak into the mask to check the microphone and volume Take the mask off and put it back in the stowage cup To Test The Crew Oxygen Mask Before Flight, Without Removing It: • • • • • • Make sure the audio jack is correctly connected Make sure the oxygen hose is correctly attached to the oxygen outlet Make sure the minimum pressure is supplied by seeing that the pressure indicator shows green Make sure the regulator works by turning the control knob to the EMER position Keeping the control knob in the EMER position can empty the oxygen system The microphone can be checked by listening to the regulator pressurization in the headset TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 28 of 50 BOMBARDIER DHC 8-400 (PWC PW150) INTENTIONALLY LEFT BLANK TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 29 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS CREW OXYGEN SYSTEM CREW OXYGEN INDICATION AND SERVICING The Crew Oxygen Indication and Servicing system monitors the crew oxygen system. The crew oxygen indication and servicing system allows the oxygen system to be monitored for both safety and for maintenance purposes. The crew oxygen indication and servicing system includes the components that follow: • • Flight Compartment Oxygen Pressure Gauge Overboard Discharge Indicator TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 30 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - CREW OXYGEN INDICATION AND SERVICING, DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 31 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS CREW OXYGEN SYSTEM CREW OXYGEN INDICATION AND SERVICING CONTINUED The crew oxygen indication and servicing system let the pilot and copilot accurately determine the amount of oxygen that is available for emergency use. The system also releases excessive pressure through an overboard discharge indicator if pressure is more than 2750 psig (18961 kPag). FLIGHT COMPARTMENT OXYGEN PRESSURE GAUGE The Flight Compartment Oxygen Pressure Gauge gives a visual indication of the fixed oxygen pressure. The flight compartment oxygen pressure gauge is located in the copilots side console. The flight compartment oxygen pressure gauge will supply pressure readings in the range of 0 to 2000 psig (0 to 13790 kPag). The flight compartment gauge uses a burden tube actuator and is burst rated to 3000 psig (20684 kPag). The flight compartment oxygen pressure gauge has an accuracy of ±50 psig (±345 kPag) over the range at a temperature of 70°F (21.1°C). The gauge has a 5V DC light bulb for illumination. The gauge connects with an adapter to a capillary line which is routed to the cylinder assembly. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 32 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - FLIGHT COMPARTMENT OXYGEN PRESSURE GAUGE TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 33 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS CREW OXYGEN SYSTEM OVERBOARD DISCHARGE INDICATOR The Overboard Discharge Indicator gives a visual indication of over-pressurization of the fixed oxygen cylinder. The overboard discharge indicator is located on the right side of the aircraft nose. The assembly includes a green disk. The overboard discharge indicator is connected to the high pressure relief port of the oxygen cylinder by the high pressure hose assembly and quick-disconnect coupling. The green disc will blow out if the cylinder pressure exceeds 2575 to 2775 psig (17754 to 19133 kPag) at 70ºF (21.1°C). TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 34 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - OVERBOARD DISCHARGE INDICATOR DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 35 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS PASSENGER OXYGEN SYSTEM The passenger oxygen system is used to supply oxygen to 10% of the passengers in the event the aircraft depressurizes, at or above altitudes requiring the use of supplementary oxygen. The passenger oxygen system supplies oxygen for 10% of the passengers. There is an adequate supply of oxygen to allow descent from 25,000 to 14,000 ft (7620 to 4267 m) in 4 minutes and hold at 14,000 ft (4267 m) for a duration of 120 minutes. The passenger oxygen system uses three portable high pressure cylinders with three masks on each cylinder. The passenger oxygen cylinder assemblies are stowed in the passenger draft bulkheads. Two passenger oxygen cylinder assemblies are retained in the aft draft bulkhead right cabinet. The third passenger oxygen cylinder assembly is retained in the forward draft bulkhead. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 36 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - SAS INTERIOR: FORWARD PASSENGER AND FLIGHT ATTENDANT OXYGEN BOTTLES LOCATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 37 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - SAS INTERIOR: AFT PASSENGER OXYGEN BOTTLES LOCATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 38 of 50 BOMBARDIER DHC 8-400 (PWC PW150) INTENTIONALLY LEFT BLANK TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 39 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS The burst disc lets the cylinder vent if the pressure reaches 2495 to 2775 psig (17205 to 19133 kPag) at 60°F (16.5°C). PASSENGER OXYGEN SYSTEM HIGH PRESSURE CYLINDERS A carry harness is attached to each cylinder and is used to attach the cylinder to either the passenger or the aircraft seat. The mask is adjusted to fit the face of the passenger and the mask hose line is connected to the bottle outlet. Each passenger oxygen cylinder assembly has a regulator assembly, a carry harness and a mask stowage bag. Each oxygen cylinder supplies three polyvinyl masks connected by silicone tubing. These mask assemblies are retained in a mask stowage bag. The regulator assembly has a green ON/OFF control knob, fill port, three mask outlets, pressure gauge and a safety fitting with an integral burst disk. A green regulator ON/ OFF control knob is located on the top of each cylinder. The cylinders are retained in place by upper and lower retaining brackets. The green control knob is turned to the FULL ON position to start the oxygen flow, and to the FULL OFF position to stop the oxygen flow. The brackets prevent damage to the cylinder assemblies when stowed. They also prevent harm to the passengers and crew members from unsecured cylinders falling. The upper bracket has a quick -release mechanism that allows the bottle to be completely removed. The regulator reduces cylinder pressure to 70 psig (483 kPag) for delivery to the masks. Each regulator has an integral low pressure relief valve that protects the low pressure mask assemblies. The filler adapter is attached to the charging valve and the cylinder is charged to the rated pressure. The three cylinder assemblies have an 11 ft³ (0.311 m³) capacity. They are of composite construction rated for a maximum operational pressure of 1850 psig (2755 kPag) at 70°F (21.1°C). The cylinder is removed from the aircraft for refilling. Each outlet has a quick -disconnect receptacle to receive the mask Quick -disconnect plug. The outlets are calibrated to let a maximum of 2.0 L/min flow at 25,000 ft (7620 m) altitude. Each regulator has a pressure gauge calibrated 0-2000 psig (0-13790 kPag). The emergency frangible burst disc is on the safety fitting of each cylinder assembly regulator. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 40 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - PASSENGER OXYGEN CYLINDERS, DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 41 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS PORTABLE OXYGEN SYSTEM The crew portable oxygen system has Protective Breathing Equipment (PBE) units and an optional portable flight attendant oxygen cylinder assembly. The PBE units protect the crew members from the effects of smoke, carbon dioxide, harmful gases and oxygen deficiency. GENERAL DESCRIPTION The PBE units are located throughout the aircraft near the fire extinguishers. They supply the crew members with a portable oxygen supply and eye protection. The locations of the PBE units are clearly labelled and the units are easily accessible to the crew. The flight attendant oxygen system is intended for single person use. The flight attendant oxygen bottle is located in a compartment in the forward galley. PROTECTIVE BREATHING EQUIPMENT Each PBE unit has a hood which seals around the wearer neck to keep out any harmful gases and fumes and then supply oxygen. There are four PBE units, one in the flight compartment and three in the passenger compartment. FLIGHT COMPARTMENT COMPONENTS In the flight compartment, the PBE unit is located in a storage container attached to the bulkhead behind the copilots seat. It is easily accessible by both pilots. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 42 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - EMERGENCY EQUIPMENT LOCATOR/FLIGHT COMPARTMENT BULKHEAD TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 43 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS PORTABLE OXYGEN SYSTEM PROTECTIVE BREATHING EQUIPMENT CONTINUED CABIN COMPONENTS The three containers are located in the passenger compartment. The PBE are located in storage containers near the fire extinguishers. One, in the forward draft bulkhead and two in the aft draft bulkhead. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 44 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - PASSENGER COMPARTMENT EMERGENCY EQUIPMENT TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 45 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS PORTABLE OXYGEN SYSTEM PROTECTIVE BREATHING EQUIPMENT CONTINUED The PBE unit is a self-contained breathing device. It is stored in a container with an easily removed see-through door. The unit is kept in a vacuum sealed pouch for protection from moisture and contamination. The unit is ready for use as long as a pull strip on the sealed pouch is intact and there is no visual indication of loss of vacuum. Pulling the strip breaks the vacuum seal and lets the wearer use the protective breathing equipment. Each PBE unit has a hood which seals around the wearer neck to keep out any harmful gases and fumes. The hood has a clear view front panel which allows for aural communication such as using the cabin interphone or the radio. The wearer puts on the hood and pulls the straps. This action activates an oxygen generator which supplies an initial flow of oxygen to purge the hood. The PBE unit is a demand system. The exhaled air from the wearer passes through a canister of potassium dioxide. The water vapour and carbon dioxide from the exhaled air is converted to oxygen which can be used by the wearer. The rate of conversion to oxygen is based on the work rate demanded by the wearer. The canister is sized to supply a minimum of 15 minutes of oxygen at pressure altitudes of up to 8000 feet (2438 metres). TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 46 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - PROTECTIVE BREATHING EQUIPMENT DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 47 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - PROTECTIVE BREATHING EQUIPMENT DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 48 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS - PROTECTIVE BREATHING EQUIPMENT DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 49 of 50 BOMBARDIER DHC 8-400 (PWC PW150) OXYGEN SYSTEMS Another placard located inside the compartment identifies the minimum dispatch pressure and the appropriate service manual references for maximum charge pressure and inspection intervals. PORTABLE OXYGEN SYSTEM FLIGHT ATTENDANT OXYGEN In addition to the PBE units, a portable oxygen system, dedicated to the flight attendant, is available as a customer option. The flight attendant portable oxygen system has: • • • • • • • • A bottle assembly with pressure gauge A constant flow outlet A low pressure relief valve A high pressure frangible safety plug An on-off valve A charging valve A constant flow mask with a flow indicator and a 50 inch (1.27 metres) long connecting hose A mask reservoir bag and a carrying strap The flight attendant oxygen system is intended for single person use. It has a mask connected by a hose to the outlet of an oxygen bottle. When required, the oxygen bottle is turned on and the mask is placed over the user mouth and held in place by an elastic strap. More oxygen flows from the bottle than is needed to allow for leakage. The flight attendant oxygen bottle is located in a compartment in the G6 galley. The bottle is installed with an upper and lower bracket. The upper bracket has an overcentre sprung latch which secures the neck of the bottle. The lower bracket is circular and secures the bottom part of the bottle to the galley panel. A placard located on the outside of the galley compartment identifies the contents inside. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 35 - OXYGEN Issue 6 - January 2023 Page 50 of 50