21-51-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E95089
A

737-300/400/500
MAINTENANCE MANUAL

REPAIR THE WIRING (WDM 21-61-01).
 INSTALL THE AIR CONDI-TIONING ACCESSORY UNIT, M324 (AMM 21-51-06/401).
REPLACE THE AIR CONDI-TIONING ACCESSORY UNIT, M324 (AMM 21-51-06/401).
PACK TRIP OFF Light on the P5 Panel Is On.
Figure 103 (Sheet 6)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E95092
A

737-300/400/500
MAINTENANCE MANUAL

FROM SHEET 5
(BLOCK 9)

YES
NO

10 MOVE THE APPLICABLE TEMPERATURE SELECTOR TO THE
"MANUAL WARM" POSITION.
 MOVE THE CONT CABIN

NOTE:IF THE AIR MIX VALVE IS

(PASS CABIN) TEMPERATUREOK, THE POSITION SELECTOR TO "MANUAL WARM" AND
INDICATOR WILL MOVE TO
MAKE A VOLTAGE MEASUREMENT
THE "HOT" POSITION.
FOR 115V AC AT PIN 2
LOOK AT THE APPLICABLE (WDM 21-61-01). "AIR MIX VALVE" POSITION IS THERE 115V AC AT PIN 2? INDICATOR ON THE P5 PANEL.
DOES THE MIX VALVE POSITION INDICATOR MOVE TO THE "HOT" POSITION?
YES
YES

11 DO THE BITE TEST ON THE
CABIN TEMPERATURE CONTROLLER,
M345.

DOES THE CABIN TEMPERATURE CONTROLLER INDICATE A PROBLEM?
NO

SEE SHEET 8 (BLOCK 12)
PACK TRIP OFF Light on the P5 Panel Is On. Figure 103 (Sheet 7)
E95096
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
FROM SHEET 7
(BLOCK 11)
NO

YES

12 TURN OFF THE PACK(AMM 21-00-00/201).

EXAMINE THE VISUAL INDICATOR ON THE APPLICABLE PACK FLOW CONTROL AND SHUTOFF VALVE, V18 (V19).
 DOES THE VISUAL INDICATOR SHOW THAT THE VALVE IS FAILED IN THE OPEN POSITION?

73 REPLACE THE APPLICABLE
PACK FLOW CONTROL AND SHUTOFF
VALVE, V18 (V19)
(AMM 21-51-71/401).

PACK TRIP OFF Light on the P5 Panel Is On.
Figure 103 (Sheet 8)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E95098
A
737-300/400/500MAINTENANCE MANUAL
 AIR CYCLE SYSTEM - ADJUSTMENT/TEST
__________________________________
 1.  General_______
 A.  This procedure has these tasks:
 (1)  
System Test - Air Cycle System - Pack Flow Control and Shutoff Valve

 (2)  
System Test - Air Cycle System - Pack Thermal Switch and Protective Circuit

 (3)  
System Test - Air Cycle System - Pack Thermal Switch Test

 (4)  
Operational Test - ACM Compressor Discharge and Turbine Inlet Switches

 (5)  
Operational Test - Air Cycle System - Turbofan Valve Test

 (6)  
Operational Test - Air Cycle System - Flow and Primary Heat Exchanger Test

 (7)  
Operational Test - Air Cycle System - 35°F Control System Test

 (8)  
Operational Test - Air Cycle System - APU Flow Mode Test

 (9)  
BITE Test - 35 Degree F Controller

 B.  The system tests of the air cycle system does a check for electrical continuity and correct operation of the system components.
 C.  The operational test of the ACM compressor discharge and turbine inlet switches will make sure the switches operate correctly when heated to a specified temperature.
　
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