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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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