(2)
Access Panels
317AL APU Access Door - Left
318AR APU Access Door - Right
D.
Procedure
S 424-007
CAUTION: MAKE SURE YOU DO NOT HIT THE AIR INLET PLENUM WITH YOUR HANDS
_______ OR YOUR TOOLS. DAMAGE TO THE AIR INLET PLENUM CAN OCCUR.
CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY.
_______ IF YOU DO NOT REMOVE THE PROTECTION COVERS, DAMAGE TO THE APU CAN OCCUR.
(1)
Do these steps to install the thermocouple trim box (1):
(a)
If the thermocouple trim box (1) is a new or a different serviceable part, do these tasks: Thermocouple Trim Box Calibration and Thermocouple Trim Box Resistance Check (AMM 49-61-04/501).
(b)
Put the thermocouple trim box (1) on the air inlet plenum with the washer (2) and bolt (3).
(c)
Install the two ground straps (5) on the thermocouple trim box
(1)
with the washer (2) and bolt (3).
(d)
Tighten the two bolts (3) to 36-40 inch-pounds (4.1-4.5 newton-meters).
(e)
Do these steps to connect the electrical connector D95011 (P11)
(4)
to the thermocouple trim box (1):
1) Connect the electrical connector D95011 (P11) (4) to the thermocouple trim box (1).
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49-61-04
ALL ú ú 02 Page 404 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
2) Tighten the coupling ring on the electrical connector D95011 (P11) (4) until the electrical connector is at the bottom of the receptacle and the connection is tight.
3) Make sure the electrical connection is not loose when you move the APU harness.
E. Put the Airplane Back to Its Usual Condition
S 864-009
(1)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(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 864-010
(2)
Remove the DO-NOT-OPERATE tag from the APU control switch on the P5 overhead panel.
S 414-023
(3)
Close the left APU access door, 317AL, and right APU access door, 318AR:
(a)
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 right access door.
(b)
Install the two quick-release pins in the two brackets on the right APU compartment bulkhead.
(c)
Lift the right access door until you can install the lanyard on the pin at the aft APU compartment bulkhead.
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.
(h)
Close the two APU access doors.
(i)
Close the six latches on the right access door.
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