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 (1) Put the air/ground relay sytem back to the ground mode
 (AMM 32-09-02/201).
 S 865-264
 (2) Put the engine speed cards back to their nomal condition
 (AMM 77-12-03/201).
 S 865-410
 (3) Turn the L and R PACK selectors, on the P5 panel, to the OFF
 position.
 S 865-268
 (4) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a) On the P11 panel:
 ú  1) 11Q22 APU POWER
 ú  2) 11Q10, LEFT ENG BLEED
 S 865-269
 (5) Push the L and R RECIRC FAN switch-lights to OFF.
 S 865-270
 (6) Close the main equipment center access door, 119AL
 (AMM 06-41-00/201).
 S 865-271
 (7) Remove the pneumatic power if it is no longer necessary
 (AMM 36-00-00/201).
 S 865-272
 (8) Remove the electrical power if it is no longer necessary
 (AMM 24-22-00/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-51-00
 ALL  ú ú 06.1 Page 519 ú Sep 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 TASK 21-51-00-715-340
 5.  Pack Temperature Sensor Test____________________________
 A. Equipment
 (1)
Decade resistance box, commercially available

 (2)
DC Voltmeter, 0-30 v dc, commercially available

 B.
References

 (1)  
AMM 06-41-00/201, Fuselage Access Doors and Panels

 (2)  
AMM 06-46-00/201, Entry, Service and Cargo Doors

 (3)  
AMM 24-22-00/201, Electric Power - Control

 (4)  
AMM 36-00-00/201, Pneumatic - General

 C.
Access

 (1)  
Location Zones 119 Main equipment center 135/136 Environmental control system bay

 (2)  
Access Panels 193HL/194HR Environmental control system bay doors 119BL Main equipment center access door

 D.
Prepare for the Test

 S 865-364
 (1)  
GUN 006-999; Make sure these circuit breakers are closed:

 (a)  
Overhead Circuit Breaker Panel, P11: 1) 11A13, AIR COND PACK LEFT AUTO CONT 2) 11A14, AIR COND PACK LEFT FLOW CONT 3) 11A15, AIR COND RIGHT STANDBY CONT 4) 11A26, AIR COND LEFT STANDBY CONT 5) 11A28, AIR COND PACK RIGHT AUTO CONT 6) 11A29, AIR COND PACK RIGHT FLOW CONT 7) 11M11, LEFT PACK AUTO POWER 8) 11M15, RIGHT PACK STANDBY POWER 9) 11M19, RIGHT PACK AUTO POWER 10) 11M24, LEFT PACK STANDBY POWER

 S 865-375
 (2)  
GUN 001-005; Make sure these circuit breakers are closed:

 (a)  
Overhead Circuit Breaker Panel, P11: 1) 11M10, LEFT PACK AUTO POWER 2) 11M11, LEFT PACK AUTO CONT 3) 11M13, LEFT PACK FLOW CONT 4) 11M15, RIGHT PACK STANDBY POWER 5) 11M16, RIGHT PACK STANDBY CONT 6) 11M19, RIGHT PACK AUTO POWER 7) 11M20, RIGHT PACK AUTO CONT 8) 11M22, RIGHT PACK FLOW CONT 9) 11M24, LEFT PACK STANDBY POWER 10) 11M25, LEFT PACK STANDBY CONT

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-51-00
 ALL  ú ú 14 Page 520 ú Jan 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 S 865-338
 (3)  
Supply electrical power (AMM 24-22-00/201).

 S 865-337

 (4)  
Push the ECS/MSG switch on the EICAS maintenance panel, P61.

 NOTE: This will show the ECS maintenance page on the bottom EICAS
____
 display.

 S 015-341
 (5)  
Open the ECS access doors, 193HL/194ER (AMM 06-41-00/201).

 E.
Procedure

 NOTE:____This test can only be done on one pack at a time. Do the test on the left pack, then do the test on the right pack. The steps in parentheses are for the test on the right pack.
 S 035-295
 (1)  
Disconnect the electrical connector from the No. 1 compressor outlet temperature sensor on the left (right) pack.

 S 435-296

 (2)  
Connect the decade resistance box to the electrical connector of the No. 1 compressor outlet temperature sensor.
　
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