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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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