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MAINTENANCE MANUAL
D. References
(1)
AMM 12-13-04/301, Auxiliary Power Plant
(2)
AMM 24-22-00/201, Electrical Power - Control
(3)
AMM 31-41-00/501, Engine Indicating and Crew Alerting System
(4)
AMM 49-27-03/201, APU Filters
(5)
AMM 49-27-06/201, APU Generator Seal Plate
(6)
AMM 49-11-00/501, Auxiliary Power Unit
E. Access
(1)
Location Zones
315/316 APU Compartment
(2)
Access Panels
315AR/316AL APU Compartment
F. Prepare for the Installation
S 034-033
(1)
Remove the input shipping cover from the generator input face.
S 434-012
(2)
Lubricate and install a new O-ring (8) on the input spline.
Lubricate with MIL-L-23699 or MIL-L-7808.
S 434-013
(3)
Install the large nuts on the studs of the APU mount pad. Keep a minimum of 1 inch between the nuts and the seal plate.
S 644-014
(4)
AIRPLANES WITH APU P/N S351T020-1, -3, -7, -9, -11 PRE-GARRETT-SB 331-49-5493; Lightly coat the APU input spline shaft with Aeroshell Grease 16.
S 144-015
(5)
AIRPLANES WITH APU POST-GARRETT-SB 331-49-5493;
Clean the grease from the APU generator input spline before
installing the APU generator.
S 434-016
CAUTION: REMOVE THE PLUGS FROM THE OIL-IN AND THE OIL-OUT OPENINGS OF
_______ THE GENERATOR. THE PLUGS WILL PREVENT FLOW OF OIL AND CAUSE DAMAGE TO THE GENERATOR.
(6) Remove the plugs from the oil-in and the oil-out openings of the APU generator.
G. Procedure
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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MAINTENANCE MANUAL
S 424-017
CAUTION: DO NOT ALLOW THE GENERATOR TO HANG ON TO THE INPUT SHAFT DURING
_______ INSTALLATION. FAILURE TO SUPPORT THE GENERATOR PROPERLY, CAN DAMAGE THE SHAFT.
(1) Install the generator as follows:
(a)
Use the eyebolt and the fishpole hoist to hold the generator to the APU.
(b)
Align the oil-in and oil-out openings of the generator, with the mating openings of the APU.
(c)
Put the studs of the APU mount pad through the holes of the generator.
(d)
Turn the generator counterclockwise 7 degrees. The pins on the flange must align with the slots in the seal plate, and the holes in the APU gearbox.
(e)
Make sure the generator spline and the APU gearbox spline align.
(f)
If adjustment of the APU gearbox spline is necessary, continue as follows: 1) Remove the sheet metal cap from the APU starter. 2) Turn the shaft of the APU starter to align with the gearbox
spline of the APU. 3) Install the sheet metal cap on the APU starter.
(g)
Tighten the stud nuts (1) to 175-200 pound-inches (19.8 - 22.6 Newton-meters).
S 434-018
(2) Connect the electrical connection as follows:
CAUTION:_______MAKE SURE THE WIRES ARE INSTALLED CORRECTLY. INCORRECT INSTALLATION OF THE WIRES CAN CAUSE CIRCUIT MALFUNCTION AND/OR DAMAGE TO EQUIPMENT.
CAUTION: INSTALL CIRCULAR WASHERS BETWEEN THE TERMINAL NUT AND THE
_______ PHASE WIRE. DO NOT INSTALL WASHERS BELOW THE PHASE WIRES. TO DO SO CAN CAUSE HEATING WHICH CAN CAUSE THE TERMINAL BLOCK TO BURN.
(a)
Attach the four phase leads to the generator terminal studs.
(b)
Install the spiralock nuts (7), the self-locking nuts, or the washers and terminal nuts on the terminal studs.
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