(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 014-023
(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.
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A
747-400 MAINTENANCE MANUAL
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.
(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.
C.
Ignition Cable Removal
S 024-026
WARNING: DO NOT TOUCH THE IGNITION COMPONENTS UNTIL YOU DO THESE STEPS.
_______ THESE STEPS WILL RELEASE THE HIGH VOLTAGE FROM THE IGNITION EXCITER. IF YOU DO NOT OBEY THIS PROCEDURE, INJURY TO PERSONS CAN OCCUR.
(1)
Do these steps to release the high voltage from the ignition exciter
(2)
and to remove the ignition cable (1):
(a)
Make sure six minutes have gone by since the last APU start.
WARNING: MAKE SURE YOU DISCONNECT THE ELECTRICAL CONNECTOR
_______ D95006 (P6) (3) FROM THE IGNITION EXCITER (2) TO RELEASE THE HIGH VOLTAGE. YOU DISCONNECT THE ELECTRICAL CONNECTOR AS A PRECAUTION THAN A MAINTENANCE TASK. INJURY TO PERSONS CAN OCCUR.
(b) Disconnect the electrical connector D95006 (P6) (3) from the ignition exciter (2).
CAUTION: DO NOT LET THE BRAID OR FERRULE OF THE IGNITION CABLE MOVE
_______ WHEN YOU LOOSEN THE TWO COUPLING NUTS. DAMAGE TO THE IGNITION CABLE CAN OCCUR.
(c) Loosen the coupling nut on the ignition cable (1) until you can disconnect the ignition cable from the ignition exciter (2).
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A
747-400
MAINTENANCE MANUAL
FWD SEE A
APU COMPARTMENT
(2 LOCATIONS) 1. IGNITION CABLE 2. IGNITION EXCITER CONNECTOR, 3. ELECTRICAL D95006 (P6)
FWD
SEE B
A
Ignition Cable Installation
Figure 401 (Sheet 1)
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