(2)
An installation of the exhaust gas temperature thermocouple.
B.
The immersion thermocouple is referred to as the exhaust gas temperature (EGT) thermocouple.
C.
Six EGT thermocouples are installed around the turbine exhaust housing on the APU engine.
TASK 49-61-03-004-001
2. Exhaust Gas Temperature Thermocouple 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 864-030
(1)
Make sure the APU control switch on the P5 overhead panel is OFF and attach a DO-NOT-OPERATE tag.
S 864-031
(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 014-032
(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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49-61-03
ALL ú ú 02 Page 401 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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.
Exhaust Gas Temperature Thermocouple Removal
S 024-038
(1)
Do these steps to remove the EGT thermocouple (4):
(a)
Remove the two bolts (1), two washers (1A), two insulator brackets (1B) and two nuts (2) that attach the EGT thermocouple (4) to the positive (KP) and negative (KN) bus bars.
(b)
Remove the forward sealing cover (5) and aft sealing cover (6).
(c)
Remove the two bolts (3) that attach the EGT thermocouple (4) to the turbine exhaust housing.
(d)
Remove the EGT thermocouple (4).
(e)
Make sure you install all necessary protection covers.
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