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49-81-31
ALL ú ú 02 Page 413 ú Jul 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
S 434-059
(9)
Install the APU power plant (AMM 49-11-00/401).
S 824-061
(10)
AIRPLANES WITH THE DUCT ALIGNMENT ASSEMBLY; Make sure there is a minimum clearance of 0.75 inch between the exhaust duct muffler and the exhaust port of the APU turbine section:
(a)
If it is necessary, adjust the bolts that attach the duct alignment assembly to the brackets until the clearance is correct.
(b)
Tighten the bolts that attach the sliding nuts in the groove of the duct alignment assembly.
S 434-063
(11) AIRPLANES WITH THE DUCT ALIGNMENT ASSEMBLY; Install the caps to the drip pan:
(a)
Apply the sealant to the mating surface of the caps.
(b)
Attach the caps to the drip pan with the bolts.
S 414-039
(12)
Close both of the access doors on the airplane tail cone.
S 414-049
(13)
Close the APU cowl door:
(a)
Disconnect the door support rods.
(b)
Put the door support rods in the clips on the APU cowl door.
(c)
Close the APU cowl door.
(d)
Close the latches for the APU cowl door.
S 864-050
(14)
Set the circuit breaker and the switch:
(a)
Remove the DO-NOT-CLOSE tag and close this circuit breaker: 1) E3-3 Electrical Shelf, APU Control Unit
(b)
Remove the DO-NOT-OPERATE tag from the APU master switch on the P5 forward overhead panel.
(15)
Do a test of the APU fire detection system (AMM 26-15-00/501).
S 734-051
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
49-81-31
ALL ú ú 02 Page 414 ú Nov 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
APU LUBRICATION SYSTEM - DESCRIPTION AND OPERATION
__________________________________________________
1. General
_______
A. The APU engine is lubricated by the APU lubrication system. The APU lubrication system keeps oil on all gears and bearings of the APU engine. Also, the oil decreases the temperature of the APU engine parts. The components of the APU lubrication system are the oil pump, oil cooler, and oil tank.
2. Oil Pump
________
A. The oil pump has two pumps: the pressure pump and the scavenge pump. The oil pump also has a pressure regulator valve, oil filter, and filter bypass valve. The oil pump is installed on the gearbox.
B. The same shaft turns the pressure pump and scavenge pump. The pressure pump has two gears that supply the oil to the bearings, gears, and shafts of the APU engine. The scavenge pump has three gears. The scavenge pump collects the oil from the oil sump of the accessory drive and from the bearing cavity between the compressor impeller and the turbine wheel. The scavenge pump sends the oil through the oil cooler to the oil tank. The oil inlet lines and oil outlet lines are connected to the body of the oil pump with threaded ports. The scavenge line from the accessory drive to the oil pump is an internal line between the gearbox and the oil pump.
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