(b)  
For the temperature sensor B at the pack 1, Disconnect the electrical connector, DT1612.

 (c)  
For the temperature sensor A at the pack 2, Disconnect the electrical connector, DT1610.

 (d)  
For the temperature sensor B at the pack 2, Disconnect the electrical connector, DT1613.

 (e)  
For the temperature sensor A at the pack 3, Disconnect the electrical connector, DT1611.

 (f)  
For the temperature sensor B at the pack 3, Disconnect the electrical connector, DT1614.

 S 034-006
 (2)
Remove the four fasteners from the temperature sensor flange.

 S 024-007

 (3)  
Remove the temperature sensor from the duct.

 TASK 21-62-07-404-008
 3.  Pack Discharge Temperature Sensor Installation (Fig. 401)______________________________________________
 A. References
 (1)  
06-09-03/201, Body Section 44 Access Doors and Panels

 (2)  
21-51-00/501, Air Conditioning Pack System

 (3)  
24-22-00/201, Manual Control

 (4)  
AIPC 21-62-07 Fig. 1

 (5)  
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. Install the Temperature Sensor
 S 424-009
 (1)  
Put the temperature sensor in its position on the duct.

 S 434-010

 (2)  
Install the four fasteners which hold the temperature sensor flange to the duct.

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747-400 MAINTENANCE MANUAL
 S 434-025
 (3)  
Tighten the fasteners to a torque value of 12-14 in-lbs.

 S 434-011

 (4)
Connect the electrical connector to the temperature sensor:

 (a)  
For the temperature sensor A at the pack 1, Connect the electrical connector, DT1609.

 (b)  
For the temperature sensor B at the pack 1, Connect the electrical connector, DT1612.

 (c)  
For the temperature sensor A at the pack 2, Connect the electrical connector, DT1610.

 (d)  
For the temperature sensor B at the pack 2, Connect the electrical connector, DT1613.

 (e)  
For the temperature sensor A at the pack 3, Connect the electrical connector, DT1611.

 (f)  
For the temperature sensor B at the pack 3, Connect the electrical connector, DT1614.

 D. Do a Test of the Temperature Sensor
 S 864-019
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 864-020

 (2)  
Remove the DO-NOT-OPERATE tag from the PACKS switch on the P5 overhead panel.

 S 864-012

 (3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (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 744-021
 (4)  Do the ground test for the pack temperature controller A if you installed a temperature sensor A (Ref 21-51-00/501).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400 MAINTENANCE MANUAL
 S 744-022
 (5)  Do the ground test for the pack temperature controller B if you installed a temperature sensor B (Ref 21-51-00/501).
 E. Put the Airplane Back to Its Usual Condition
　
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