(a)
Make sure there is no damage to the two EGT bus bars.
(b)
Make sure the two EGT bus bars do not touch each other.
(c)
Make sure there are no unwanted metal parts on the two EGT bus bars.
(d)
If you find damage, the two EGT bus bars touch each other or there are unwanted metal parts on the two EGT bus bars, repair or replace the positive (KP) and/or negative (KN) bus bar(s).
E.
Put the Airplane Back to Its Usual Condition
S 864-027
(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 864-028
(2)
Remove the DO-NOT-OPERATE tag from the APU control switch on the P5 overhead panel.
S 414-029
(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.
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747-400
MAINTENANCE MANUAL
(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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747-400 MAINTENANCE MANUAL
THERMOCOUPLE TRIM BOX - REMOVAL/INSTALLATION
____________________________________________
1. General
_______
A. This procedure has these tasks:
(1)
A removal of the thermocouple trim box
(2)
An installation of the thermocouple trim box.
B.
The thermocouple trim box is installed on the bottom left aft side of the air inlet plenum.
TASK 49-61-04-004-001
2. Thermocouple Trim Box Removal (Fig. 401)
_____________________________
A. 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
B.
Prepare for the Removal
S 864-002
(1)
Make sure the APU control switch on the P5 overhead panel is OFF and attach a DO-NOT-OPERATE tag.
S 864-003
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P6-2 Main Power Distribution Panel
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