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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
APU OVERTEMPERATURE THERMOCOUPLE - REMOVAL/INSTALLATION
_______________________________________________________
1. General
_______
A. This procedure contains the removal and the installation tasks for the APU overtemperature thermocouple.
B. The overtemperature thermocouple is on the aft end of the APU in the exhaust baffle. You can get access to the thermocouple through the APU cowl door.
TASK 49-52-71-004-001
2. APU Overtemperature Thermocouple Removal (Fig. 401)
________________________________________
A. References
(1) IPC 49-60-01 Fig. 1
B. Access
(1)
Location Zones
101 Flight Compartment, LH
205 Electronic Compartment
703 APU Compartment
(2)
Access Panels
1201 Electronic Equipment Access Door
3804 APU Cowl Door
C. Procedure
S 864-002
(1) Set the switch and the circuit breaker:
(a)
Set the APU master switch, on the P5 forward overhead panel, to the OFF position and attach a DO-NOT-OPERATE tag.
(b)
Open this circuit breaker and attach a DO-NOT-CLOSE tag: 1) E3-3 Electrical Shelf, APU Control Unit
S 014-003
(2) Open the APU cowl door:
(a) Open the latches for the APU cowl door.
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
ELECTRICAL
CONNECTOR
SEE A
FWD OVERTEMPERATURE CONTROL SWITCH CLAMPS THERMOCOUPLE CABLE A IGNITION UNIT SEE B EXHAUST BAFFLE GROMMET
TURBINE EXHAUST
MOUNTING FLANGE
SHIM WASHER GROMMET
RETAINER (2 LOCATIONS) WASHER OVERTEMPERATURE CONTROL THERMOCOUPLE
BOLT B
APU Overtemperature Thermocouple - Installation Figure 401
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(b)
Open the APU cowl door.
(c)
Connect the door support rods.
S 014-004
CAUTION:_______BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD. DAMAGE TO THE SHROUD DRAIN LINES CAN OCCUR.
(3) Remove the lower shroud:
(a)
Hold the lower shroud and open the shroud latches.
(b)
Remove the lower shroud.
S 024-005
(4) Remove the overtemperature thermocouple:
(a)
Disconnect the thermocouple cable from the overtemperature control switch.
(b)
Remove the clamps that attach the thermocouple cable to the tube assemblies.
(c)
Remove the bolt, the washers, and the retainer that hold the thermocouple in the mounting flange.
(d)
Remove the thermocouple in a straight line from the mounting flange.
(e)
Remove the grommet.
(f)
Pull the thermocouple through the exhaust baffle.
