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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
6.  APU Air Inlet (Fig. 1)
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 A.  The air inlet door and the air inlet ducts supply the air to the APU. The APU air inlet supplies compressor air to the APU engine compressor and cooling air to the cooling fan. The air inlet system has the air diffuser duct, compressor air duct, cooling air duct, vortex generator, torque box liner, and air inlet door.
 B.  The air inlet door is installed on the right side of the airplane tail section. Two pushrods and an electrical actuator operate the air inlet door. The air inlet door does not fully close. This will keep the air inlet pressure more than the tailpipe pressure at all times. For a more detailed description of the APU air inlet, refer to AMM 49-15-00/001.
 7.  APU Engine (Fig. 2)
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 A.  The APU engine is a gas turbine engine that operates on a continuous cycle. The APU engine has a compressor section, turbine section and gearbox assembly. The APU engine supplies the bleed air for pneumatic power and the shaft power to turn the APU electrical generator.
 B.  The APU engine has two primary assemblies and three subsystems. The two primary assemblies are the turbine assembly and the gearbox assembly. The three subsystems are the fuel system, lubrication system, and electrical system.
 8.  APU Fuel (Fig. 2)
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 A.  The APU fuel system supplies the fuel to the APU engine from the No. 1 fuel tank of the airplane. The APU fuel system monitors the supply of fuel to the combustion chamber of the APU. This lets the APU operate at a constant speed and safe turbine temperature under different load conditions.
 B.  The components of the APU fuel system are the APU fuel valve, fuel heater, fuel control unit, and combustor unit. The APU fuel system also has the fuel solenoid valve and fuel drain. For a more detailed description of the APU fuel system, refer to AMM 49-31-00/001.
 9.  APU Ignition and Start System (Fig. 2)
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 A.  The APU ignition and start system turns the APU engine and supplies the ignition to the fuel-air mixture in the combustor unit. The ignition system has the ignition unit, igniter cable, and igniter plug. The start system has the starter motor and start relay R5. For a more detailed description of the ignition and start system, refer to AMM 49-41-00/001.
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10. APU Air (Fig. 2)
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 A.  The APU air system has two subsystems: the accessory cooling air system (AC air system) and the bleed air system. The AC air system supplies the air to decrease the temperature of the APU electrical generator, APU lubrication system, APU engine parts, and APU shroud. The bleed air system supplies the pneumatic power for the airplane pneumatic system. For a more detailed description of the cooling air system, refer to AMM 49-51-00/001. For a more detail description of the bleed air system, refer to AMM 49-52-00/001.
 11. APU Controls (Fig. 1)
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 A.  The APU controls have switches that are automatically and manually controlled. These switches start, operate, and stop the APU engine. The components for the APU controls are found on the APU engine, in the APU control unit, and on the P5 forward overhead panel.
 B.  The main components of the APU controls are the APU master switch and APU control unit.
 12. APU Indicating (Fig. 1)
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 A.  The APU indicating system has the exhaust gas temperature (EGT)
 indicating system and the APU indicating system.

 B.  The EGT indicating system monitors the exhaust gas temperature of the APU engine. The EGT indicating system has the thermocouples, EGT indicator, and EGT resistor. For a more detailed description of the EGT indicating system, refer to AMM 49-71-00/001.
 C.  The APU indicating system monitors the APU condition and the APU operation. The APU indicating system has the indicator lights and elapsed time indicator. For a more detailed description of the APU indicating system, refer to AMM 49-72-00/001.
 13. APU Exhaust (Fig. 1)
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 A.  The APU exhaust system sends the exhaust gases from the APU engine out of the airplane. The APU exhaust system also decreases the noise level of the APU engine. The exhaust duct and the aft fairing are the parts of the APU exhaust system. For a more detailed description of the APU exhaust system, refer to AMM 49-81-00/001.
　
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