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 21-62-06
 ALL  ú ú 01 Page 404 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 PACK DISCHARGE TEMPERATURE SENSOR - REMOVAL/INSTALLATION
________________________________________________________
 1.  General_______
 A.  This procedure has two tasks. The first task is the removal of the pack discharge temperature sensors. The second task is the installation of the temperature sensors. There are two temperature sensors, A and B, for each of the three air conditioning packs.
 B.  The procedure has these steps:
 (1)  
set the air conditioning pack to off

 (2)  
get access to the temperature sensor

 (3)  
remove the temperature sensor

 (4)  
install the temperature sensor

 (5)  
do a test of the temperature sensor

 TASK 21-62-07-004-001
 2.  Pack Discharge Temperature Sensor Removal (Fig. 401)_________________________________________
 A.  References
 (1)  
06-09-03/201, Body Section 44 Access Doors and Panels

 (2)  
AIPC 21-62-07 Fig. 1

 (3)  
SSM 21-62-01

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

 (2)  
Access Panels
 191H-R Air Conditioning Access Door
 191N-L Air Conditioning Access Door

 C.  Prepare to Remove the Temperature Sensor
 S 864-002
 (1)  
Put the PACKS (1,2 or 3) switch to OFF, on the P5 overhead panel for the applicable pack (1,2 or 3).

 (2)  
Put a DO-NOT-OPERATE tag on the PACKS switch.

 S 864-003

 (3)  
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)  
P415 Power Distribution Center - Right 1) 415C38, PACK TEMP CONT B 2) 415K27, PACK TEMP CONT A

 S 864-023
 S 014-004
 (4) Open the access panel for the applicable pack (Ref 06-09-03/201):
 (a)  191N-L for the packs 1 and 2
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-62-07
 ALL  ú ú 03 Page 401 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
SEEB1 2
SEE A
PACK DISCHARGE
OVERHEAT SWITCH

FWD
SEE C
PACK DISCHARGE
A
TEMP SENSOR B
PACK DISCHARGE
OVERHEAT SWITCH

PACK DISCHARGE AFTTEMP SENSOR A
FWD
PACK DISCHARGE
TEMP SENSOR A

A/C PACKS NO. 1 AND 2
B 1  PACK DISCHARGE TEMP SENSOR B
PACK DISCHARGE
TEMP SENSOR B

PACK DISCHARGE TEMP SENSOR A
FWD PACK DISCHARGE
PACK 2 GROUND OVERHEAT SWITCH
SERVICE CONNECTION
A/C PACK NO. 3
C
A/C PACK NO. 2
B2
1
AIRPLANES WITH TWO GROUND SERVICE CONNECTIONS
2
AIRPLANES WITH THREE GROUND SERVICE CONNECTIONS
Pack Discharge Temperature Sensor Installation
Figure 401

H49036
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 21-62-07
 ALL  ú ú 02 Page 402 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  192H-R for the pack 3
 D. Remove the Temperature Sensor
 S 034-005
 (1) Disconnect the electrical connector from the temperature sensor:
 (a)  
　
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