(f)
Close the latches on the APU access doors.
TASK 49-21-00-206-032
3. Load Compressor Diffuser Duct Gasket Inspection_______________________________________________
A. References
(1)
AMM 12-13-02/301, Auxiliary Power Unit
(2)
AMM 49-11-00/201, Auxiliary Power Unit
B.
Consumable Materials
(1)
B00130 Alcohol, Isopropyl - TT-I-735
(2)
D00418 Oil - Aircraft Turbine Engine
(3)
A00482 Sealant - Adhesive Silicone, RTV159
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A
747-400
MAINTENANCE MANUAL
C. Access
(1)
Location Zones
317 APU Compartment - Left
318 APU Compartment - Right
310 Fuselage - Station 2360 to Station 2792
(2)
Access Panels
317AL APU Access Door - Left
318AR APU Access Door - Right
D.
Prepare for the Inspection
S 866-046
(1)
Make sure the APU control switch on the P5 overhead panel is OFF and attach a DO-NOT-OPERATE tag.
S 866-047
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P6-2 Main Power Distribution Panel
1) 6K18, APU ALTN CONT
(b)
P83 Aft APU Equipment Control and Circuit Breaker Panel 1) APU PRIME CONT
S 016-043
(3)
Open the left APU access door, 317AL, and right APU access door, 318AR:
(a)
While you hold the two APU access doors in the closed position, open the six latches on the right access door.
NOTE: The left access door will open fully and the right
____ access door will drop approximately one inch (2.5 cm) from the fuselage frame when the last latch is opened.
NOTE: A lanyard is attached to the aft end of the right access
____ door to hold the access door to the APU compartment bulkhead.
CAUTION: BE CAREFUL NOT TO MOVE THE TWO APU ACCESS DOORS TO THE
_______ OUTBOARD SIDE FROM THE FULL OPEN POSITION. THE FULL OPEN POSITION IS WHERE THE APU ACCESS DOOR IS DOWN AND THE TWO HOLD-OPEN RODS ARE CONNECTED TO THE TWO BRACKETS ON THE APU COMPARTMENT BULKHEAD. DAMAGE TO THE ELEVATOR CONTROL SURFACES CAN OCCUR.
(b)
Open the left access door to the fully open position and remove the two hold-open rods from the two clips.
(c)
Remove the two quick-release pins from the two brackets on the left APU compartment bulkhead.
(d)
Connect the two hold-open rods from the left access door to the two brackets and install the two quick-release pins.
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747-400 MAINTENANCE MANUAL
(e)
Push the right access door up and remove the lanyard from the pin on the aft APU compartment bulkhead.
(f)
Open the right access door to the fully open position and remove the two hold-open rods from the two clips.
(g)
Remove the two quick-release pins from the two brackets on the right APU compartment bulkhead.
(h)
Connect the two hold-open rods from the right access door to the two brackets and install the two quick-release pins.
E.
Inspection Procedure
S 216-045
(1)
Do a check for air leakages around the load compressor diffuser duct flange:
(a)
Tighten the 88 nuts on the duct flange of the load compressor diffuser to 25-28 inch-pounds (2.8-3.2 newton-meters) in a top-to-bottom-to-top sequence.
(b)
Close these circuit breakers and remove the DO-NOT-CLOSE tags: 1) P6-2 Main Power Distribution Panel a) 6K18, APU ALTN CONT
2) P83 Aft APU Equipment Control and Circuit Breaker Panel a) APU PRIME CONT 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 机载辅助动力 1(153)
