21-51-00
 ALL  ú ú 06 Page 523 ú Jan 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 S 715-311
 (17)
 Turn the L (R) PACK selector, on the P5 panel, to OFF.

 S 035-322

 (18)
 Disconnect the electrical connector from the No. 2 (standby) compressor outlet temperature sensor of the left (right) pack.

 S 435-323

 (19)
 Connect the No. 1 decade box to the electrical connector of the No. 2 (standby) compressor outlet temperature sensor.

 (a)  
Set the resistance of the No. 1 decade box to 500 ohms.

 S 035-324
 (20)
 Disconnect the electrical connector from left (right) pack temperature sensor No. 2.

 S 435-325

 (21)
 Connect the No. 2 decade box to the electrical connector of left (right) pack temperature sensor No. 2.

 (a)  
Set the resistance of the No. 2 decade box to 3000 ohms.

 S 715-327
 (22)
 Turn the L (R) PACK selector, on the P5 panel, to STBY-N.

 (a)  
Make sure the L (R) RAM IN DOOR indication on the ECS
 maintenance page is less than 0.06.

 (b)  
Make sure the L (R) TEMP VALVE indication on the ECS
 maintenance page is less than 0.06.

 (c)  
Make sure the voltmeter shows 0 vdc.

 S 715-328
 (23)
 Slowly increase the resistance of the No. 1 decade box to 1000 ohms.

 (a)  
Make sure the voltmeter shows 8-10 vdc.

 S 715-329
 (24)
 Slowly decrease the resistance of the No. 1 decade box to 500 ohms.

 (a)  
Make sure the voltmeter shows 0 vdc.

 S 715-330
 (25)
 Slowly increase the resistance of the No. 2 decade box to 8000 ohms.

 (a)  
Make sure the voltmeter reads 8-10 vdc.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-51-00
 ALL  ú ú 06 Page 524 ú Jan 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 S 715-331
 (26)
 Slowly decrease the resistance of the No. 2 decade box to 3000 ohms or less.

 (a)  
Make sure the voltmeter reads 0 vdc.

 S 715-332
 (27)
 Turn the L (R) PACK selector, on the P5 panel, to OFF.

 S 035-333

 (28)
 Disconnect the decade boxes from the applicable electrical connecters.

 S 035-334

 (29)
 Disconnect the DC Voltmeter and the 80 ohm resistor from the electrical connector for the low limit valve.

 S 435-335

 (30)
 Connect the electrical connectors to compressor outlet temperature sensor No. 2, the low limit valve, and pack temperature sensor No. 2.

 S 735-140

 (31)
 Do the Temperature Sensors Test for the right pack.

 F.
Put the Airplane Back to its Usual Condition

 S 415-139
 (1)  
Close the left (right) ECS access door, 193HL.

 S 865-343

 (2)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 TASK 21-51-00-705-184
 6.  Pack/Zone System Health Check_____________________________
 A. General
 (1)  
This task has the steps to do a health check for the pack and the trim air system.

 (2)  
A health check gives a quick indication that the system operates correctly.

 B.
References

 (1)  
AMM 21-51-00/501, Operational Test - Cooling Pack System

 (2)  
AMM 21-61-00/501, Operational Test - Primary (Zone) Temperature Control System

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

 (4)  
AMM 27-61-00/201, Spoiler/Speedbrake Control System

 (5)  
AMM 32-09-02/201, Air/Ground Relays

 (6)  
AMM 36-00-00/201, Pneumatics - General

 (7)  
AMM 49-11-00/201, Auxiliary Power Unit

 (8)  
AMM 49-61-05/201, APU Control Unit (ECU)

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
　
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