NOTE: The lanyard will hold the right access door on the APU
____
compartment bulkhead.
(d)
Remove the two quick-release pins, disconnect the two hold-open rods and put the two hold-open rods in the two clips on the left access door.
(e)
Install the two quick-release pins in the two brackets on the left APU compartment bulkhead.
(f)
Make sure the insulation covers are correctly attach to the APU compartment firewall.
(g)
Lift the left access door until the two APU access doors are approximately aligned.
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747-400
MAINTENANCE MANUAL
(h)
Close the two APU access doors.
(i)
Close the six latches on the right access door.
TASK 49-11-00-862-049
7. APU Dry Motoring (Fig. 203)
________________
A. General
(1)
Do this task when it is necessary to remove fuel or fuel gas that is in the APU. Air that goes through the engine removes the fuel gases from the combustion area and the exhaust system.
B.
Equipment
(1)
Container - Fuel Resistant, 5 U.S. Gallons (18.9 Liters)
C.
Consumable Materials
(1)
D00098 Fuel, Turbine Engine - P01-001
(2)
D50029 Lubricant, Fluorocarbon Release Agent (Spray) - PWC06-005
D.
Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 203 | 1 | Packing | 49-31-00 | 01 | 65 | 2.......….......…...................................…...........…......….......1
E.
Access
(1)
Location Zones
221 Control Cabin - Left
222 Control Cabin - Right
310 Fuselage - Station 2360 to Station 2792
(2)
Access Panels
317AL APU Access Door - Left
318AR APU Access Door - Right
F.
Procedure
S 862-050
(1)
Make sure the APU control switch on the P5 overhead panel is OFF and attach a DO-NOT-OPERATE tag.
S 862-051
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P6 Main Power Distribution Panel
1) 6H18, APU DC FUEL PUMP
2) 6K18, APU ALTN CONT
(b)
P83 Aft APU Equipment Control and Circuit Breaker Panel 1) APU PRIME CONT
(c)
P180 DC Power Distribution Panel 1) 180H4, FUEL BOOST PUMP CONT AFT 2 & FWD 3
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747-400 MAINTENANCE MANUAL
(d) P414 Power Distribution Center - Left Panel
1) 414R18, FUEL BOOST PUMP MAIN AFT 2
S 012-341
(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.
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