S 034-026

 (2)  
Remove the DO-NOT-OPERATE tags from the other two PACKS selectors, on the P5 panel.

 S 864-021

 (3)  
Remove the electrical power, if it is not necessary
 (Ref 24-22-00/201).

 (4)  
Remove the locks for the body and wing gear doors.

 S 094-022
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A
747-400 MAINTENANCE MANUAL
 COMPRESSOR DISCHARGE TEMPERATURE BULB - REMOVAL/INSTALLATION
____________________________________________________________
 1.  General_______
 A.  This procedure has instructions to remove and install the compressor discharge temperature bulbs. One temperature bulb is installed at the compressor outlet of each air cooling pack.
 TASK 21-51-19-004-001
 2.  Compressor Discharge Temperature Bulb Removal (Fig. 401)_____________________________________________
 A.  References
 (1)  
IPC 21-51-16 Fig. 01

 (2)  
WDM 21-52-11

 (3)  
SSM 21-52-01

 B.  Access
 (1)  
Location Zone
 133 Air Conditioning Equipment Bay, LH
 134 Air Conditioning Equipment Bay, RH

 (2)  
Access Panels
 191AL Air Conditioning Access Door
 191HL Air Conditioning Access Door
 192AR Air Conditioning Access Door

 C.  Prepare for the Removal
 S 864-002
 (1)  Make sure the applicable (1, 2, or 3) PACKS selector, on the overhead panel, P5, is in the OFF position.
 (a)  Put a DO-NOT-OPERATE tag on the selector.
 S 864-003
 (2) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P6 Main Power Distribution Panel
 1) 6F35, PACK TEMP CONT A
 2) 6F36, PACK TEMP CONT B

 (b)  
P6 Power Distribution Center - Right 1) 415K27, PACK TEMP CONT A

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747-400 MAINTENANCE MANUAL
SEE A
SEE A FWD
ELECTRICAL CONNECTOR COMPRESSOR DISCHARGE DUCT
COMPRESSOR DISCHARGE 
TEMPERATURE BULB OVERHEAT 
SWITCH (REF) 

A

Compressor Discharge Temperature Bulb Installation
Figure 401

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747-400 MAINTENANCE MANUAL
 2) 415C38, PACK TEMP CONT B
 S 014-004
 (3) Open the applicable access door (Ref 06-09-03/201):
 -191AL for pack 1,
 -191HL for pack 2,
 -192AR for pack 3
 D. Remove the Temperature Bulb
 S 034-005
 (1)
Disconnect the electrical connector from the temperature bulb.

 S 024-019

 (2)
Cut and remove the lockwire from the temperature bulb.

 S 024-006

 (3)
Use two wrenches to remove the temperature bulb.

 NOTE: Use one wrench to hold the boss and the other wrench to
____
 turn the temperature bulb.

 TASK 21-51-19-404-007
 3. Compressor Discharge Temperature Bulb Installation (Fig. 401)
__________________________________________________
 A. References
 (1)
AMM 06-09-03/201, Body Section 44 Access Doors and Panels

 (2)
AMM 20-11-28/401, Lockwire
　
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