(a)
Lift or lower the APU by pulling or pushing the APU gearbox assembly until the seal is lightly compressed by the cooling fan flange.
NOTE: Lowering the right aft mount on the APU will lift the cooling fan flange and compress the seal. Lifting the right aft mount will lower the cooling fan flange and make the seal not compressed.
(b)
Measure the distance from the bottom of the vibration isolator on the right aft mount to the bottom of the cap on the engine mount bracket.
NOTE: The clearance between the vibration isolator and the cap must be 0.08-0.14 inches.
(c)
Do the above adjustment steps again until the clearance between the vibration isolator and the cap is correct.
500
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I. Close mount caps and install bolts, washers, and nuts. Tighten nuts to a torque range of 30 to 40 pound-inches.
NOTE: Ensure minimum gap of 0.005-inch between cap lip and mount gusset after torquing. This will ensure positive clamp-up on vibration isolator.
J. Rotate compressor plenum to match compressor air inlet opening in plenum with air inlet duct in upper shroud.
K. Move compressor air inlet duct lock handle inboard until heel of cam falls behind spring arm. Install locking screws and nuts (2) to secure locking handle.
L. Slacken hoist cables and disconnect cables from tubes by removing pins.
M. Remove pins securing cradle base to APU power plant and remove cradle.
N. Remove pins securing hoist to brackets in APU compartment and remove hoists.
501
Feb 01/95 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-11-0 Page 406A
E32314
Right Aft mount Adjustment 501
49-11-0 Figure 402 Feb 01/95
Page 406B
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
O. Slide bleed air duct coupling inboard as far as it will go.
P. Install clamp attaching bleed air duct coupling to turbine plenum bleed air flange. Tighten clamp-coupling nut to a torque range of 45 to 55 pound-inches.
Q. Connect fuel hose to elbow on low-pressure fuel filter (View 1, Fig. 401).
R. Connect fire detection sensor element plug to receptacle on upper shroud and safety wire.
S. Connect bleed load control air line to fitting in upper shroud.
T. Connect EGT indicating system plug to receptacle in upper shroud and safety wire.
U. Connect APU generator control plug to receptacle in upper shroud and safety wire.
V. Connect APU harness, APU starter motor, and APU generator plugs to receptacles in upper shroud and safety wire connectors.
W. Connect APU to upper shroud bonding jumper (Fig. 401, Detail C).
X. Depreserve or purge the fuel system by motoring (AMM 49-11-0/201).
6. Restore Airplane to Normal Configuration
A. Position lower shroud against upper shroud and close shroud latches.
CAUTION: MAINTAIN A MINIMUM CLEARANCE OF 0.18 INCH BETWEEN ENGINE PLUMBING, FIRE DETECTOR, CLAMPS AND INSIDE SURFACE OF LOWER SHROUD.
EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
B. Disengage APU compartment access door rods and stow rods. Close and latch access door.
C. Close the following circuit breakers on circuit breaker panel P6.
(1)
FIRE PROTECTION, DETECTION APU
(2)
APU GENERATOR CONTROL
(3)
APU CONT
Aug 01/94 49-11-0 Page 407 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(4)
HOT BAT, BAT BUS CONT
(5)
HOT BAT, GEN CONT
(6)
HOT BAT BUS
D. Close the circuit breaker on M280 module - APU accessory unit on E3-3 electronics shelf.
E. Position BATTERY SWITCH to ON and remove placards.
F. Test and adjust power plant. Refer to APU Power Plant - Adjustment/Test.
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AUXILIARY POWER UNIT - ADJUSTMENT/TEST
1. General
A. The APU is tested by accomplishing the following:
CAUTION: TO AVOID DAMAGING APU, OBSERVE OPERATING LIMITS (AMM 49-11-0/201).
(1)
Operating the APU under a "loaded" condition and observing that APU operates within defined limits
(2)
A fuel control unit acceleration limiter valve cracking pressure (opening) test
(3)
A fuel control unit governor speed setting test under a NO LOAD condition
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