Bombardier DHC 8-400 (PWC PW150) Oil System ATA 79 - January 2023 PDF

BOMBARDIER DHC 8-400 (PWC PW150) ATA 79 - OIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY B1/B2 MAINTENANCE TRAINING MANUAL Issue 6 - January 2023 Page 1 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM GENERAL DESCRIPTION The oil pressure and scavenge systems supply pressurized, filtere...

BOMBARDIER DHC 8-400 (PWC PW150) ATA 79 - OIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY B1/B2 MAINTENANCE TRAINING MANUAL Issue 6 - January 2023 Page 1 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM GENERAL DESCRIPTION The oil pressure and scavenge systems supply pressurized, filtered oil to the engine and its components for cooling, lubrication and control. It also removes debris from the oil. The functions of the Oil Pressure and Scavenge System is performed by the: • • • • • • • • • • • • • • • • • • Pressure regulating valve (PRV) Main oil filter RGB scavenge oil filter Oil pump assembly (pressure and scavenge stages) Oil filler cap and tube assembly No.6 and No.6.5 bearing and No.7 bearing oil pressure tube No.6 and No.6.5 bearing oil scavenge tube No.7 bearing scavenge tube AC generator oil tube assembly Accessory gearbox breather tube assembly Main oil filter bypass valve Scavenge oil filter bypass valve PMA drain tube Starter/Generator drain tube Feathering pump drain tube Hydraulic pump drain tube RGB accessories drain tube Propeller shaft oil seal drain tube The Oil Pressure supplies pressurized, filtered oil to the engine, propeller control system and the AC generator. The Scavenge System scavenges the oil from the engine, propeller control system and AC generator and filters out debris. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 2 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL PRESSURE SYSTEM TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 3 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL SCAVENGE SYSTEM TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 4 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - RGB OIL SYSTEM TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 5 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM Pressure Pumps: • LEADING PARTICULARS OIL SYSTEM Pressure oil filter housing: • • Maximum Oil Consumption: • • 1 lb/hour over 10 hrs of operation (1 US gal = 7.74 lbs) (ref. only) • • Starting (minimum) -54°C Take-off 0°C to 107°C Transient (maximum) 115°C • • • Oil Tank: • • • Capacity 5.9 US gal (22.2 litre) Useable quantity 0.8 US gal (2.9 litre) Min to max on sight glass 1.6 US qts (1.5 litre) Indicate ferrous metal contamination Self closing adapters allow inspection without having to drain oil 3 chip detectors: De-aerator, RGB and A/C generator • • Installed at ACOC return line Prevent oil from running back into the engine (useable oil reduced) RGB mounted dump valve: • • • Activated by PRV bypass pressure • • Maintain oil pressure at 65 ± 5 psid (448 kPad) Oil pressure adjusted as a function of bearing cavity (No.5) pressure to provide constant oil flow at all powers Cockpit pressure - pump pressure - cavity pressure (No.5) Minimum pressure: 44 psid (303 kPad) Field adjustable Check valve: Chip detectors: • • • 12 micron filter element Impending bypass indicator: trigger at 17-24 psid (117-165 kPad) (signal sent to FADEC and EMU, fault code to CDS) Filter bypass valve: open at 34 psid (234 kPad) Pressure regulating valve (PRV): Limits: • • • Ejector pump to supply positive pressure to the vane type pump. Traps oil in RGB (more useable oil) Quicker dropping of oil pressure at shut down Less oil leakage at No.5 bearing cavity Engine driven, vane type, positive displacement protected by a strainer Flow 480 lbs/min (PPM) at 100% NH Cold Start Valve (CSV): • • Limit pressure surge during cold starting Open at 300 to 360 psid TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 6 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM No.7 bearing cavity: LEADING PARTICULARS • • OIL SYSTEM CONTINUED • Oil manifold with multiple nozzles for bearing No.7 Restrictor to drop the pressure to compensate for lower cavity air pressure. Last chance strainer Oil dampen bearing No.1 bearing cavity: • • • 2 nozzles, one on each face of the bearing Restrictor to drop the pressure to compensate for lower cavity air pressure. Last chance strainer No.2 and No.2.5 bearing cavity: • • • • Oil manifold with multiple nozzles for bearing No.2 and No.2.5 Restrictor to drop the pressure to compensate for lower cavity air pressure. Last chance strainer Oil dampen bearings No.3 and No.4 bearing cavity: • • • Oil manifold with multiple nozzles for bearing No.3 and No.4 Last chance strainer No.4 bearing is oil dampen No.5 bearing cavity: • • • Oil manifold with multiple nozzles for bearing No.5 Last chance strainer Oil dampen bearing No.6 and No.6.5 bearing cavity: • • • • Oil manifold with multiple nozzles for bearing No.6 and No.6.5 Restrictor to drop the pressure to compensate for lower cavity air pressure. Last chance strainer No.6 bearing is oil dampen TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 7 of 98 BOMBARDIER DHC 8-400 (PWC PW150) • OIL SYSTEM LEADING PARTICULARS Relieve valve to assist the pump at high power (blow-down) to prevent pump cavitation and cavity flooding. Oil is pushed to AGB Accessory gearbox (AGB): OIL SCAVENGE SYSTEM • Scavenge by a vane type pump and returns oil to tank through the de-aerator at low power. No.1 bearing cavity: • • Scavenge by a jet pump and directs oil to RGB sump Jet pump activated by oil pump pressure No.2 and No.2.5 bearing cavity: • Scavenge by a vane type pump and returns oil to tank through the de-aerator No.3 and No.4 bearing cavity: • Scavenge by a vane type pump and returns oil to tank through the de-aerator No.5 bearing cavity: • • Scavenge by a vane type pump and returns oil to tank through the de-aerator at low power Relieve valve to assist the pump at high power (blow-down) to prevent pump cavitation and cavity flooding. Oil is pushed to AGB No.6 and No.6.5 bearing cavity: • • Scavenge by a vane type pump and returns oil to tank through the de-aerator at low power Relieve valve to assist the pump at high power (blow-down) to prevent pump cavitation and cavity flooding. Oil is pushed to AGB No.7 bearing cavity: • Scavenge by a vane type pump and returns oil to tank through the de-aerator at low power TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 8 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM RGB sump: • LEADING PARTICULARS • RGB OIL PRESSURE SYSTEM Scavenge by a vane type pump and returns oil to tank through RGB chip detector and scavenge oil filter RGB scavenge oil temperature is also used to warm up the front inlet case rear lip to prevent an ice build up (anti-icing) RGB auxiliary oil tank: • • • • • Located in RGB rear housing Pressurized tank with capacity of 5.3 US quarts (5 litres) It supplies oil to: RGB gear train for lubrication, AC generator for lubrication, PCU pump (to operate the propeller system) and auxiliary feathering pump to feather the propeller in an emergency during take-off If the engine fails during take-off power, the Auxiliary Feathering Pump is the only LRU that can be supplied with oil from the auxiliary oil tank The Auxiliary Feathering Pump is the only LRU that can take oil in the tank in static condition LEADING PARTICULARS - RGB OIL SCAVENGE SYSTEM RGB scavenge oil filter housing: • • • • 12 micron filter element Impending bypass indicator: trigger at 17 to 24 psid (117 to 165 kPad) Filter bypass valve: Maintains oil supply when filter becomes restricted. Open at 34 psid (234 kPad) A/C generator: • • Scavenge by a vane type pump and returns oil to tank through A/C chip detector and RGB scavenge oil filter In case of overflow oil is directed to RGB sump Propeller system, Overspeed Governor and Gear Train: • Oil is directed to RGB sump TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 9 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM COMPONENT LOCATION AND DESCRIPTION PRESSURE REGULATING VALVE (PRV) The pressure regulating valve controls the oil delivery pressure in a direct relationship to No.5 bearing air pressure. The PRV is a balanced single piston valve. It has: • • • • • A piston A sleeve A compression spring An adjuster A cover The valve is assembled into the left side of the low pressure compressor case. The PRV regulates system oil pressure from the oil pump against the No.5 bearing cavity pressure. When system oil pressure is more than the preset limit the valve opens and oil is bypassed back to the tank. Engine differential pressure is maintained between 61 and 72 psid (421 and 497 kPad) for all operating conditions. The PRV can be adjusted by a manually turned adjuster. This adjuster is accessed by the removal of the PRV cover. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 10 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - PRESSURE REGULATING VALVE TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 11 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM COMPONENT LOCATION AND DESCRIPTION CONTINUED MAIN OIL FILTER The main oil filter removes any debris that may be contained in the oil. The main oil filter removes any debris that may be contained in the oil before the oil is distributed to the turbomachinery, the RGB modules and the propeller control. The filter is a 12 micron filter and is located on the left side of the engine. The filter is non-cleanable and incorporates a Dirt Alert strip that is used to analyze the debris removed from the oil. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 12 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - MAIN OIL FILTER TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 13 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM COMPONENT LOCATION AND DESCRIPTION CONTINUED RGB SCAVENGE OIL FILTER The RGB oil filter separates any debris that may be contained in the oil that is scavenged from the RGB. The filter is a 12 micron filter and is located on the right side of the engine. The filter is non-cleanable and incorporates a Dirt Alert strip that is used to analyze the debris removed from the oil. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 14 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - RGB SCAVENGE OIL FILTER TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 15 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM COMPONENT LOCATION AND DESCRIPTION CONTINUED OIL PRESSURE AND SCAVENGE PUMP ASSEMBLIES The oil pressure and scavenge pump assembly pressurizes and scavenges the oil in the engine oil system. The scavenge pumps also optimize bearing cavity sealing during a sub-idle condition. The pump assembly consists of 9 vane type pump stages and a cold start valve. These vane pumps are contained in a pump pack and are located on the right side of the engine. This pump pack is serviced as one line replaceable unit. The cold-start valve is a spring loaded poppet valve. The cold start valve operates when very cold oil causes the oil pressure to be too high. The valve operates at a pressure of 300 to 360 psid (2068 to 2482 kPad) and bypasses oil back to the oil tank. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 16 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL PUMP ASSEMBLY TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 17 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM COMPONENT LOCATION AND DESCRIPTION CONTINUED OIL FILLER CAP AND TUBE ASSEMBLY The oil filler cap and tube assembly is used to replenish the oil system and seal the entrance to the oil tank on completion. The filler cap seals off the entrance to the oil tank. The cap is provided with a spring loaded lift flap to unlock and requires a half-turn to release it. The oil filler has an external scupper with a drain fitting to catch any oil overflow. Inside the filler tube is a non-return ball valve. The valve allows oil to be added and seals the filler tube to prevent oil loss in the event that the filler cap is missing. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 18 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL FILLER CAP AND TUBE ASSEMBLY TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 19 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL DISTRIBUTION SYSTEM GENERAL DESCRIPTION The purpose of the oil system is to supply clean, filtered oil to the engine for lubrication of moving parts and to remove any debris from the oil and retain it for later analysis. The oil system is a wet-sump system. The oil is cooled by an aircraft mounted aircooled oil cooler. The oil system supplies a constant flow of clean filtered oil to the turbo-machine and reduction gearbox bearings to cool and lubricate the running shafts, gears and component surfaces. This flow of oil also carries away any contamination. Air that is trapped in the oil is removed from the system by a cyclonic de-aerator, located at the top of the oil pump pack. Filters in the pressure and scavenge systems remove contaminants from the oil. The filter housings contain impending bypass switches, which sense pressure differential. When a filter is becoming blocked, the switches send a signal to the related Full Authority Digital Electronic Control (FADEC) and the Engine Monitoring System (EMS) to warn of an impending bypass. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 20 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL DISTRIBUTION SYSTEM SYSTEM DESCRIPTION The oil is contained in a tank that is integral to the LP compressor case. The tank has a sight glass, for viewing the oil quantity, and a filler neck and cap for replenishing the oil supply. A second, smaller, tank is located in the reduction gearbox. This tank is supplied with oil from the main tank. The oil pumps are assembled together as one unit and the entire assembly is installed in a bore located on the LP compressor case. The Oil system has these three sub-systems: • • • Pressure system that supplies oil to the reduction gearbox and the turbomachinery Scavenge system that returns the used oil to the tank Vent and breather system that vents the bearing cavities and removes any air trapped in the scavenged oil. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 21 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM Strainers located before the bearings collect any contaminants that may be present in the oil. OIL DISTRIBUTION SYSTEM Oil flows to the RGB auxiliary tank from the turbomachinery. The auxiliary tank is part of the RGB casting and is pressurized when the engine is running. This tank is always full of oil, even when the engine is not running. SYSTEM DESCRIPTION CONTINUED PRESSURE SYSTEM A vane type pressure pump is installed in a pack with the scavenge pumps, on the right side of the Low Pressure (LP) compressor case. Oil, from the auxiliary tank, is distributed through internal galleries to the reduction and accessory gear trains, bearings and to the AC generator, where it is used for cooling. Oil also flows, by internal passages and tubes, to these components: Integral passages connect the oil tank to the inlet side of the pump. Oil, under pressure, flows from the pump to the Pressure Regulating Valve (PRV) and to the Air Cooled Oil Cooler (ACOC). A pressure relief valve (cold start valve) returns oil to the tank to prevent a pressure surge during cold engine starting. • • • Auxiliary feathering pump Overspeed governor Pitch Control Unit (PCU) pump The PRV consists of a piston valve and spring in a ported sleeve. The PRV keeps a constant oil pressure above and in relation to the air pressure from the bearing cavities. If oil pump output pressure overcomes the air pressure plus spring pressure, the valve opens a port. Oil is bled from the main pressure line through the port and returned to the inlet side of the pump, reducing the output pressure. Air pressure plus spring pressure overcomes the reduced oil pressure, closing the bleed port at the correct pump output pressure. Airframe-supplied tubes connect the outlet to the airframe ACOC. From the oil-cooler the oil flows to the pressure oil filter. The pressure filter removes contaminants from the oil and has a bypass valve to ensure adequate flow if the filter is blocked. From the filter the oil flows to the fuel heater, where it warms the fuel to prevent the formation of ice crystals. From the fuel heater the oil goes to the bearings, air intake anti-icing passages and to the Reduction Gearbox (RGB). TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 22 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL PRESSURE SYSTEM TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 23 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL DISTRIBUTION SYSTEM SYSTEM DESCRIPTION CONTINUED SCAVENGE SYSTEM Oil from the No. 1 bearing is scavenged by gravity to the Reduction Gearbox (RGB) cavity. Bearings No.2, No.2.5, No.3, No.4, and No.5 are scavenged by dedicated scavenge pumps through internal oil passages. Bearings No.6, No. 6.5 and No.7 are scavenged by dedicated scavenge pumps through external oil tubes. Oil located in the Accessory Gearbox (AGB) gear trains and bearings is also scavenged by a dedicated pump. The scavenged oil is collected and sent to the cyclonic de-aerator located at the top of the pump pack. The oil then returns to the tank. A cyclonic de-aerator and re-timer breather, located at the top of the pump pack, remove any air that is mixed in with the oil. Oil from the de-aerator drains into the AGB and then back to the oil tank. The cyclonic de-aerator housing contains a chip detector which traps magnetic contaminants. These contaminants can be analyzed to determine engine wear. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 24 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL SCAVENGE SYSTEM TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 25 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL DISTRIBUTION SYSTEM SYSTEM DESCRIPTION CONTINUED SCAVENGE SYSTEM CONTINUED Scavenge oil from the RGB accessories, gears and bearings drains into a cavity in the bottom of the RGB rear housing. A chip detector is located in this cavity. It traps magnetic contaminants that can indicate RGB wear. From the RGB cavity, oil flows through the inlet duct lip for anti-icing of the intake and then to the RGB scavenge pump. Oil from the AC generator flows past another chip detector, through a screen and then to the AC scavenge pump. The scavenge pump is part of the pack on the turbomachinery. Oil from the AC and RGB scavenge pumps flows up through the scavenge filter to the cyclonic de-aerator and then back to the tank. The scavenge filter housing is equipped with a valve to bypass oil around the filter in the event of blockage. An indicator warns of an impending bypass. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 26 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - REDUCTION GEARBOX OIL SYSTEM TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 27 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL COOLER SYSTEM GENERAL DESCRIPTION The oil cooler system removes excess heat from the oil. The oil cooler is in the oil pressure circuit of the engines. The assembly has the oil cooler unit, the bypass valve, the air inlet duct, and the exit duct. The oil cooler system has these components: • • • • • • • Oil Cooler Oil Cooler Bypass Valve Exit Duct Oil Cooler Ejector Oil Cooler Ejector Valve Oil Cooler Air Outlet Flap Oil Cooler Air Outlet Flap Actuator TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 28 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL COOLER SYSTEM SYSTEM DESCRIPTION The oil cooler uses the air from the engine air intake to cool the oil. The air inlet duct is welded to the oil cooler. It directs airflow through the oil cooler. The exit duct is not part of the assembly. It is attached to the oil cooler with bolts and anchor nuts. The oil cooler is attached with twelve bolt and anchor nuts between two brackets at the engine firewall structure. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 29 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL COOLER SYSTEM COMPONENT LOCATION AND DESCRIPTION OIL COOLER The oil cooler keeps the oil temperature within the designed limits to make sure the oil retains its viscosity. The oil cooler unit is a brazed aluminium plate and corrugated fin assembly. The fins are 1 mm apart. This reduces possible blockage caused by contamination. The external parts of the oil cooler are aluminium alloy. A drain plug is installed at the lowest point on the oil cooler. The oil cooler is located in a cut-out in the lower cowl and is supplied with air from the inlet duct. It is enclosed in a titanium shroud with fireproof seals against the cowl to isolate it from the fire zone. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 30 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL COOLER LOCATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 31 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL COOLER SYSTEM COMPONENT LOCATION AND DESCRIPTION OIL COOLER BYPASS VALVE The oil cooler bypass valve is to bypass some, or all, of the oil to control oil temperature. The valve also provides protection for the oil cooler in the event of overpressure. The oil cooler bypass valve is installed in the left side of the oil cooler. It does these functions: • • A thermal function lets the engine oil fully bypass the oil cooler at temperatures below 170°F (77°C). Above 185°F (85°C) the engine oil continues to go through the oil cooler A pressure relief function lets the engine oil release if the oil cooler becomes blocked during cold oil operation. The pressure relief operates at 23 psid (158.6 kPad) EXIT DUCT The exit duct provides a passage for the air leaving the oil cooler. The exit duct is attached with ten bolts and anchor nuts at the rear of the oil cooler. It is also attached with eight bolts and anchor nuts at the engine firewall structure. The exit duct is a sheet metal component in a shape satisfactory for airflow. It is also a housing for the oil cooler ejector. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 32 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL COOLER DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 33 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL COOLER SYSTEM COMPONENT LOCATION AND DESCRIPTION OIL COOLER EJECTOR The oil cooler ejector prevents over-temperature of the oil system during ground operation by increasing airflow through the oil cooler. The body of the oil cooler ejector is made of stainless steel and has 22 holes along its length. It is installed in the exit duct, aft of the oil cooler. The oil cooler ejector operates when the aircraft is on the ground. It uses bleed air from downstream of the pre-cooler to eject at high pressure through the 22 holes. This causes air in the nacelle to be pulled through the oil cooler heat exchanger. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 34 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL COOLER EJECTOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 35 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL COOLER SYSTEM COMPONENT LOCATION AND DESCRIPTION OIL COOLER EJECTOR VALVE The oil cooler ejector valve controls the flow of air to the ejector. The oil cooler ejector valve is located on the forward face of the engine firewall. A spring holds it in the open position when the aircraft is on the ground. An energized solenoid causes the spring to compress and shuts the oil cooler ejector valve when the aircraft is airborne. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 36 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL COOLER EJECTOR VALVE TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 37 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL COOLER SYSTEM COMPONENT LOCATION AND DESCRIPTION OIL COOLER AIR OUTLET FLAP The oil cooler outlet flap controls the flow of air through the oil cooler. The oil cooler air outlet flap is in the bottom surface of the nacelle, aft of the engine firewall. It is hinged at its forward end and is operated by an actuator. The oil cooler air outlet flap is fully closed when the engine oil bypasses the oil cooler. When it is necessary for the engine oil to be cooled the oil cooler air outlet flap is open at one of three positions. This lets the necessary airflow exit to the atmosphere. When the oil temperature is more than the limit on the ground, the oil cooler air outlet flap is fully open at 32°. The oil cooler air outlet flap is fully closed when the oil temperature is less than the limit on the ground. When the oil temperature is more than the limit when airborne, the oil cooler air outlet flap is open at 5°. When the engine operation conditions are unusual when airborne and the oil temperature is more than the limit, the oil cooler air outlet flap is open at 10°. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 38 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL COOLER AIR OUTLET FLAP LOCATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 39 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL COOLER SYSTEM COMPONENT LOCATION AND DESCRIPTION OIL COOLER AIR OUTLET FLAP ACTUATOR The oil cooler air outlet flap actuator is to position the outlet flap to the position commanded by FADEC. The oil cooler air outlet flap actuator is attached to the nacelle structure and the oil cooler air outlet flap. It receives signals from the Full Authority Digital Engine Computer (FADEC), through the Engine Control Interface Unit (ECIU). The signals give instruction to fully open or close the oil cooler air outlet flap with two open positions between, if necessary. The time for the travel of the oil cooler air outlet flap actuator with a voltage supply of 26V DC is: • • • • • From 0° to 32° on the ground (5 to 8 sec) From 0° to 5° when airborne (1.5 to 3 sec) From 5° to 10° when airborne (1.5 to 3 sec) From 0° to 10° when airborne (3 to 6 sec) From 32° to 0° when airborne (less than 8 sec) TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 40 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL TEMPERATURE CONTROL CHART TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 41 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL COOLER SYSTEM TEST Test the operation of the oil cooler flap door and ejector solenoid using this procedure: • • • • • • PLA Flight Idle, CLA Fuel Off Maintenance Mode Discrete On Select RDC TOP Reset Simulates oil temperature of 107°C Select DEC for 2°C decrease Observe flap door and solenoid operate at correct indicated temperature TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 42 of 98 BOMBARDIER DHC 8-400 (PWC PW150) INTENTIONALLY LEFT BLANK TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 43 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM GENERAL DESCRIPTION The Oil Indicating System gives the status of the oil system to the flight compartment. The Oil Indicating System uses switches, sensors and transducers to determine and transmit the engine oil system status to the flight compartment and the engine monitoring system. The engine oil is monitored for: • • • • Oil pressure Low oil pressure Oil temperature Ferrous chips Oil temperature is also used as a reference to adjust the indicated turbine temperature. The Oil Indicating System includes these systems: • • • • • • Oil Pressure Indicating system Oil Temperature Indicating system Low Oil Pressure Warning system Chip Detection system Oil Filter Impending Bypass Warning system Oil Quantity Indicating system TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 44 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM SYSTEM DESCRIPTION The Oil Indicating System: • • • Gives oil system status to the flight compartment Sends signals to the FADEC for temperature calculation Gives a visual oil level sighting during servicing TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 45 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM SYSTEM OPERATION OIL PRESSURE INDICATING SYSTEM The oil pressure indicating system has: • • An oil pressure transducer to convert pressure to an electrical signal A wiring harness to transmit the pressure signal to the flight compartment The oil pressure transducer senses differential oil pressure at the outlet of the pressure regulating valve (PRV). This transducer converts this pressure to an electrical signal. The signal is sent to the flight compartment through the electrical wiring harness. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 46 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL PRESSURE INDICATING TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 47 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM SYSTEM OPERATION OIL TEMPERATURE INDICATING SYSTEM The oil temperature indicating system has a two channel sensor and measures the main oil temperature. Each channel provides an independent signal to the FADEC. The FADEC uses this signal as: • • • A cold junction reference for the measurement and calculation of indicated turbine temperature (ITT) An estimation of the torque shaft temperature An indication of main oil temperature to the flight compartment The sensor also provides a location to mount a resistor to trim the ITT signal to compensate for engine to engine differences in measured ITT. The FADEC continually monitors the health of the MOT sensor and will generate a signal when the MOT signal is not in the limits. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 48 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL TEMPERATURE INDICATING SYSTEM SCHEMATIC TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 49 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM SYSTEM OPERATION LOW OIL PRESSURE WARNING SYSTEM The low oil pressure warning system has a low oil pressure switch, the FADEC and a dual channel electrical switch. The pressure switch opens if the oil pressure decreases to 44 ± 3 psi (303 ± 21 kPa). The pressure switch is connected to a dual channel electrical switch normally closed. When the pressure switch is closed, the dual channel switch opens. The change of state is detected by the FADEC which sends a discrete signal to the flight compartment and Engine Monitoring Unit (EMU). The system monitors NH and the condition lever position. An OIL PRESS warning light will come on and the EMU makes a record of a low oil pressure event when the: • • • NH is more than 62% Condition lever has been in the FUEL ON position for more than 20 seconds Switch has closed due to low oil pressure TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 50 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - LOW OIL PRESSURE WARNING SYSTEM SCHEMATIC TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 51 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM SYSTEM OPERATION CHIP DETECTION SYSTEM The chip detection system uses three chip detectors to indicate the presence of ferrous chips coming from the: • • • AC generator Turbomachinery module RGB module The system signals are transmitted electrically to the FADEC channel A and digitally to FADEC channel B. Ferrous debris in the oil system is attracted to the chip detector poles. If the poles are bridged by debris, a signal is sent to the FADEC. The FADEC will then output an ARINC 429 and a RS422 message to the flight compartment and the EMU. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 52 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - CHIP DETECTION SYSTEM SCHEMATIC TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 53 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM SYSTEM OPERATION OIL FILTER IMPENDING BYPASS WARNING SYSTEM The oil filter impending bypass warning system uses a bypass switch to warn of an impending bypass of oil across the oil filter. This indicates a contaminated oil filter. When the oil filter differential pressure is more than 22 psid (152 kPad), the pressure switch opens. This change of state is detected by the FADEC which then sends a discrete signal to the EMU. The EMU makes a record of a main oil filter impending bypass event. During operation with cold oil main oil temperature less than 175°F (80°C), any impending bypass signal is ignored by the FADEC. This will prevent false event messages from being stored in the EMU. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 54 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL FILTER IMPENDING BYPASS WARNING SCHEMATIC TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 55 of 98 BOMBARDIER DHC 8-400 (PWC PW150) • • OIL SYSTEM Light off: Level low or 10 hours (or less) flight time remaining Light flashing: No valid reading or EMU is being interrogated by the CDS OIL INDICATING SYSTEM SYSTEM OPERATION OIL QUANTITY INDICATING SYSTEM The oil quantity indicating system has: • • • An oil level indicator sight glass A calibrated dipstick A low oil level indicator glass to indicate oil quantity The sight glass and the dipstick are used during normal engine servicing. The low oil level indicator is used to give a quick visual indication for oil in the tank. RMT OIL LEVEL INDICATION SYSTEM (OPTIONAL) On aircraft with the Remote Oil Level Indication system (812CH0006) a visual indication is given in the flight compartment. The system gives indication that there is approximately 10 flying hours or less of engine oil based on nominal oil consumption. The system is considered to be non-essential for operation of the aircraft. The Aircraft Maintenance manual (AMM) still requires oil level checks using the bullseye and sight glass. The oil level indication of this system is supplementary to the required AMM oil level checks. The Remote Oil Level indications are: • Light steady on: Level is good. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 56 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - REMOTE OIL INDICATION SYSTEM BLOCK DIAGRAM TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 57 of 98 BOMBARDIER DHC 8-400 (PWC PW150) • • OIL SYSTEM OIL INDICATING SYSTEM Main oil temperature is <88°C Reed switch position is stable for a minimum of 10 seconds The engine was operated between Disc and Flight Idle for at least 2 minutes prior to shutdown to allow full oil scavenging. MOT is less than 99°C. The engine has been shutdown between one and fifteen minutes to allow the oil level to stabilize. The switch position has been stable for at least ten seconds. SYSTEM OPERATION RMT OIL LEVEL INDICATION SYSTEM (OPTIONAL) CONTINUED The standard engine oil filler cap/dipstick is replaced by an oil filler cap/sensor assembly. The sensor is a reed type sensor switch set at 10 hours above the level at which the loss of oil pressure may occur if operating at the extremities of the attitude envelope. The sight gauge and low level bulls-eye remain on the engine to facilitate manual visual oil level indication. The RS422 data is valid. Operating the Flight Compartment switch will show the level switch status the last time the EMU recorded a valid reading: a lamp not illuminating indicates 10 hours or less flight time remaining. The EMU will also allow for an update of the switch status if it has changed from open to closed indicating that the tank has been replenished. For this purpose the engine running, stabilized idle and shutdown time requirements are ignored. A flashing indicator lamp means: The EMU has been unable to achieve a successful update of the switch position after more than 2.5 hours of engine running time since the last update, or the EMU is being interrogated through the CDS. FADEC software monitors the oil level reed switch and sends oil level condition to the Engine Monitoring Unit (EMU). The EMU performs the required logic, verification and monitoring of the required conditions for determining the oil level status. The EMU checks for oil level status: • • 10 seconds after electrical power up of the FADEC and EMU 60 seconds after engine shutdown At electrical power up, EMU oil level status is updated if both: • • Oil temperature <88°C Reed switch position has been stable for 10 seconds At engine shut down, the oil level status is updated if the: • • • Engine has been running for >15 minutes Engine was operated at or below FI for >2 minutes prior to shut down Engine has been shut down for between 1 and 15 minutes electrical power to FADEC on TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 58 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - REMOTE OIL INDICATION SYSTEM FILLER NECK TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 59 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM SYSTEM OPERATION RMT OIL LEVEL INDICATION SYSTEM (OPTIONAL) CONTINUED If these conditions listed above are correct, the EMU flag is updated to indicate OK or low oil level. In both situations the EMU Oil Level status is stored in the EMU so that the Oil Level Indication System can be interrogated at any time even in flight. This is because the system is simply giving the stored information. However, to avoid confusion regarding the intention of the system, the control panel is placarded For Ground Use Only. If the above conditions are not satisfied the EMU oil level status remains unchanged. However, if more than 2.5 engine running hours have elapsed since the last successful update of the oil level status in the EMU, status will be changed to No Valid Reading. Indication is given only when the system interrogation switch is selected to on. CONDITION FLIGHT COMPARTMENT DISPLAY Oil level OK Steady green light Oil level low No light No valid reading Flashing green light EMU switch failed No light FADEC channel failed No light In all cases no light indicates that maintenance action is required. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 60 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - REMOTE OIL LEVEL INDICATION DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 61 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM COMPONENT LOCATION AND DESCRIPTION OIL PRESSURE TRANSDUCER The oil pressure transducer sends an oil pressure differential signal to the Integrated Flight Cabinet (IFC) for display in the flight compartment. The oil pressure transducer is located at the bottom of the low pressure compressor case on the left side of the engine. It is installed in an oil wetted cavity and is held in place with two bolts and sealed with preformed packings. Wiring harness connector (P55) is connected to the transducer. The transducer signal is transmitted to the flight compartment through the wiring harness. A ground strap connects the housing of the transducer to the low pressure compressor case. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 62 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - MOP AND LOP SENSOR LOCATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 63 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM COMPONENT LOCATION AND DESCRIPTION OIL PRESSURE TRANSDUCER CONTINUED The oil pressure transducer has: • • • • • • A housing An inlet port A reference port Two pressure sensing elements An electrical circuit board A connector The elements have two channels to provide for a backup if one channel fails. The interior of the transducer is filled with foam to prevent moisture ingress. The transducer is a welded assembly and cannot be disassembled in the field. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 64 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL PRESSURE TRANSDUCER CROSS SECTION TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 65 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM COMPONENT LOCATION AND DESCRIPTION OIL PRESSURE TRANSDUCER CONTINUED During engine operation, oil enters the inlet port and pushes on the pressure sensing element. The element converts the oil pressure to an electrical signal. Air from the No. 5 bearing cavity enters the reference port and pushes on the second pressure sensing element. This element converts the air pressure to an electrical signal. The two electrical signals are processed by the electrical circuitry and a signal is output and transmitted through the electrical wiring harness to the IFC for display in the flight compartment. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 66 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - MOP and LOP SENSOR DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 67 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM COMPONENT LOCATION AND DESCRIPTION OIL TEMPERATURE SENSOR The oil temperature sensor sends an oil temperature signal to Channels A and B of FADEC. The oil temperature sensor is located on the top of the air inlet case. It is installed in an oil wetted cavity and is held in place with two bolts and sealed with a preformed packing. Wiring harness connector (P16) is connected to a receptacle mounted on the sensor. The sensor signals are transmitted to the FADEC through the wiring harness. A ground strap connects the housing of the sensor to the air inlet case. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 68 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL TEMPERATURE SENSOR LOCATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 69 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM COMPONENT LOCATION AND DESCRIPTION OIL TEMPERATURE SENSOR CONTINUED The sensor has a housing, and four conductors of different material (two Chromel and two Alumel). The conductors are joined at one end bimetal junction. This gives the sensor two channels to provide for a backup if one channel fails. The other ends of the four Chromel and Alumel conductors are connected to the receptacle and a flexible cable that goes out of the sensor. The other end of the cable connects to the ITT thermocouple wiring harness with four terminals. On the outside of the sensor are two mounting studs. These studs hold the ITT Trim Resistor. The FADEC uses the resistor to trim the ITT signal to compensate for system tolerances. The sensor is a welded assembly and cannot be disassembled in the field. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 70 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL TEMPERATURE SENSOR DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 71 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM COMPONENT LOCATION AND DESCRIPTION LOW OIL PRESSURE SWITCH The low oil pressure switch detects low oil pressure and sends a signal to the FADEC and the flight compartment Caution and Warning Panel. The Low Oil Pressure Switch is located at the bottom of the low pressure compressor case on the left side of the engine. It is installed in an oil wetted cavity and is held in place with two bolts and sealed with preformed packings. Wiring harness connector (P46) is connected to the switch. This connector transmits the switch signal to the FADEC through the wiring harness. A ground strap connects the housing of the switch to the low pressure compressor case. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 72 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - LOW OIL PRESSURE SENSOR LOCATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 73 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM COMPONENT LOCATION AND DESCRIPTION LOW OIL PRESSURE SWITCH CONTINUED The Low Oil Pressure Switch has: • • • • • A housing An inlet port A reference port A mechanical switch A connector The switch has two channels to provide for a backup if one channel fails. The switch is a welded assembly and cannot be disassembled in the field. During engine operation, oil enters the inlet port and holds the dual channel pressure switch open. If the oil pressure decreases to 44 ± 3 psi (303 ± 21 kPa) the switch closes and a signal is sent to the FADEC. The FADEC then sends a signal to the flight compartment and the EMS. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 74 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - LOW OIL PRESSURE SENSOR DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 75 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM COMPONENT LOCATION AND DESCRIPTION CHIP DETECTORS The chip detectors attract and detect ferrous particles (debris) in the oil system and send signals to FADEC. The chip detection system has three chip detectors to indicate the presence of ferrous chips coming from the: • • • AC generator Turbomachinery module Reduction Gearbox (RGB) module The chip detector signals are transmitted electrically (analogue) to the FADEC channel A and digitally to FADEC channel B. The chip detectors are located in the scavenge oil stream of the oil system. All the oil that goes back to the main tank passes across the poles of the chip detectors. The chip detectors have: • • • A housing A magnet Two electrical poles One pole is connected to the FADEC and the other to ground. The chip detectors fit into adapters that have spring-actuated self-closing valves. These valves keep the oil in the engine when the chip detectors are removed during an inspection. During engine operation, ferrous material is attracted to the poles. If the debris is large enough or there is sufficient quantity, the material will bridge the poles and allow electrical current to flow to the FADEC. The FADEC will then output a signal to the EMU. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 76 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - TYPICAL CHIP DETECTOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 77 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM COMPONENT LOCATION AND DESCRIPTION OIL FILTER IMPENDING BYPASS SWITCH The oil filter impending bypass switch detects the pressure drop across a partially blocked engine oil filter and sends a signal to FADEC. There are two impending bypass switches in the system. One is located on the main oil filter housing and the other on the scavenge oil filter housing. They are installed in oil wetted cavities and are attached with bolts and sealed with preformed packings. Wiring harness connectors (P47 and P49) connect to the switches. The connectors transmit the switch signals to the FADEC. Ground straps connect the switch housings of the transducer to the engine cases. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 78 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - MAIN OIL FILTER IMPENDING BYPASS SWITCH TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 79 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM COMPONENT LOCATION AND DESCRIPTION OIL FILTER IMPENDING BYPASS SWITCH CONTINUED The switch is an assembly and has: • • • • A housing A switch A filter screen A spring and piston assembly The housing has two ports that let oil into the switch. These ports are located upstream and downstream of the oil filter. A receptacle is mounted on the end of the housing and is used to connect to the engine electrical wiring harness. The filter screen prevents any debris from going into the switch. The EMU makes a record of a main oil filter impending bypass event. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 80 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - MAIN OIL FILTER IMPENDING BYPASS SWITCH LOCATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 81 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM COMPONENT LOCATION AND DESCRIPTION OIL FILTER IMPENDING BYPASS SWITCH CONTINUED During engine operation, oil goes into the low and high pressure ports. This oil pushes on both sides of the piston. When the oil filter upstream and downstream pressure - differential pressure - is more than 22 psid (152 kPad), the pressure switch will open. This change of state is detected by the FADEC. The FADEC then sends a discrete signal to the EMU. The EMU makes a record of a scavenge oil filter impending bypass event. If the oil is cold main oil temperature less than 175°F (79°C) any impending bypass signal is ignored by the FADEC. This will prevent false event messages from being stored in the EMU. The switch is a welded unit and cannot be disassembled in the field. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 82 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - REDUCTION GEARBOX SCAVENGE OIL FILTER IMPENDING BYPASS SWITCH DETAIL TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 83 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM COMPONENT LOCATION AND DESCRIPTION CALIBRATED DIPSTICK The calibrated dipstick gives a visual indication of the oil level in the tank when checked after 10 minutes of engine shutdown. The calibrated dipstick is used during normal engine servicing. It is located on the oil tank on the port side of the engine. The dipstick is attached to the oil filler cap and has markings to indicate the quantity of oil that must be added during servicing. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 84 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - CALIBRATED DIPSTICK TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 85 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM COMPONENT LOCATION AND DESCRIPTION OIL LEVEL INDICATOR SIGHT GLASS The oil level indicator sight glass gives a further method to visually check the oil level in the tank. The oil level indicator sight glass is located on the oil tank on the left side of the engine. The sight glass is used during normal engine servicing. It gives a visual indication of the oil level in the tank and has markings that indicate the quantity of oil to add if required. The sight glass is attached to the oil tank with eight bolts and is sealed with preformed packings. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 86 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL LEVEL INDICATOR SIGHT GLASS TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 87 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM COMPONENT LOCATION AND DESCRIPTION LOW OIL LEVEL INDICATOR GLASS (BULLS EYE) The low oil level indicator glass bulls eye gives a visual indication of oil level in the tank. This method is used to make sure enough oil is present to start an engine that has been static for a long period. The low oil level indicator is located below the sight glass, on the left side of the engine. The indicator gives a quick visual indication for oil in the tank. The indicator is threaded into the oil tank and is sealed with a preformed packing. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 88 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - LOW OIL LEVEL BULLSEYE INDICATOR TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 89 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM SYSTEM OPERATION OIL PRESSURE INDICATING Oil pressure is indicated on the Engine Display (ED) in the flight compartment. Pressure is indicated in psi in both digital and analogue formats. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 90 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL PRESSURE INDICATING TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 91 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM SYSTEM OPERATION OIL TEMPERATURE INDICATION Oil temperature is indicated on the Engine Display (ED) in the flight compartment. Temperature is indicated in °C in both digital and analogue formats. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 92 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - OIL TEMPERATURE INDICATION TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 93 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM SYSTEM OPERATION REMOTE OIL LEVEL INDICATION A remote oil level indication system is available as an option. The system gives notification when the oil level is adequate for approximately 10 flying hours or less, based on nominal oil consumption. Indication is available only with the engines shutdown. The oil level indication system flight compartment display has: • • • Two green lights, one for each engine Test lamp switch System status interrogation switch The control panel is located on the pilot forward side console. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 94 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - REMOTE OIL LEVEL INDICATION LOCATION TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 95 of 98 BOMBARDIER DHC 8-400 (PWC PW150) OIL SYSTEM OIL INDICATING SYSTEM SYSTEM OPERATION LOW OIL PRESSURE WARNING If the oil pressure decreases to 44 ± 3 psi (303 ± 21 kPa) the switch will close and a signal is sent to the FADEC. The FADEC then sends a signal to the flight compartment Caution and Warning lights and the EMS. TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 96 of 98 BOMBARDIER DHC 8-400 (PWC PW150) ENGINE OIL - ENGINE OIL PRESSURE WARNING LIGHTS TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 97 of 98 BOMBARDIER DHC 8-400 (PWC PW150) INTENTIONALLY LEFT BLANK TO BE USED FOR MAINTENANCE TRAINING PURPOSES ONLY ATA 79 - OIL Issue 6 - January 2023 Page 98 of 98