dure. control system trouble shooting proce-35`F control valve as outlined in 35`F Problem still exists check sensor and 

COOLING SYSTEM OK - Check engine bleed air distribution system trouble shoot-ing procedure (AMM 36-11-05/101).
Figure 102 (Sheet 2)
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A 737-300/400/500MAINTENANCE MANUAL
PREREQUISITES
MAKE SURE THIS SYSTEM WILL OPERATE:
AUXILIARY POWER UNIT (APU)(AMM 49-11-00/201) (IF THE APU IS NOT AVAILABLE, YOU MUST USE A GROUND CART TO SUPPLY THE DUCT PRESSURE)
MAKE SURE THESE CIRCUIT BREAKERS ARE CLOSED: 6A3, 6A4, 6C1, 6C2, 6C3, 6C4, 6D4, 6E1, 6E2
MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION: ELECTRICAL POWER IS ON (AMM 24-22-00/201)PNEUMATIC SYSTEM PRESSURE IS PRESENT (AMM 36-05-00/201)
"PACK TRIP OFF"  NOTE:____  THIS TROUBLESHOOTING PROCEDURE IS WRITTEN FOR THE LEFT PACK TRIP OFF LIGHT. THE NUMBERS IN 
LIGHT ON THE P5  PARENTHESIS ARE FOR THE RIGHT PACK TRIP OFF 
PANEL IS ON.  LIGHT.

DESCRIPTION:
THE LEFT (RIGHT) "PACK TRIP OFF" LIGHT ON THE P5-10 AIR CONDITIONING MODULE IS ON.
POSSIBLE CAUSES:
1.  
THE PACK OR THE DUCT HAD AN OVERHEAT CONDITION . BLOCKED OR CONTAMINATED HEAT EXCHANGERS (AMM 21-51-21/701) . MIX VALVE IS FAILED (AMM 21-61-11/401) . PACK FLOW CONTROL AND SHUTOFF VALVE IS FAILED OPEN (AMM 21-51-71/401) . INSUFFICIENT AIR THROUGH THE RAM AIR SYSTEM (AMM 21-52-00/501)

-TURBO FAN (AMM 21-52-61/401)
-TURBO FAN VALVE (AMM 21-52-71/401)
-DEFLECTOR DOOR (AMM 21-52-31/401)
-RAM AIR DOOR (AMM 21-52-51/401; AMM 21-52-91/401).

2.  
OVERHEAT SWITCHES: . DUCT OVERHEAT SWITCH, S3 (S6 OR S0990)(AMM 21-61-51/401) . TURBINE INLET OVERHEAT SWITCH, S1 (S4)(AMM 21-51-18/401) . COMPRESSOR OVERHEAT SWITCH, S2 (S5)(AMM 21-51-18/401).

3.  
AIR CYCLE MACHINE IS SEIZED (AMM 21-51-11/401)

4.  
ENGINE PRECOOLER (AMM 36-12-25/401)

5.  
PRECOOLER CONTROL VALVE (AMM 36-12-35/401)

6.  
AIR-CONDITIONING ACCESSORY UNIT, M324 (AMM 21-51-06/401)

7.  
CABIN TEMPERATURE CONTROLLER, M345 (AMM 21-61-58/401)

8.  
WIRING (WDM 21-61-01; WDM 21-63-01).

PACK TRIP OFF Light on the P5 Panel Is On.
Figure 103 (Sheet 1)

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E95012
A
737-300/400/500MAINTENANCE MANUAL
FAULT ISOLATION:

SEE SHEET 5
SEE SHEET 3
(BLOCK 6)
(BLOCK 32)
PACK TRIP OFF Light on the P5 Panel Is On.
Figure 103 (Sheet 2)

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E95030
A

737-300/400/500
MAINTENANCE MANUAL

FROM SHEET 2
(BLOCK 31)
NO

YES

32 CONNECT CONNECTOR D532
56 THE SWITCH IS FAILED. (D538) TO THE COMPRESSOR REPLACE THE TURBINE INLET DISCHARGE OVHT SWITCH, S2 OVHT SWITCH, S1 (S4)(S5).(AMM 21-51-18/401).
DISCONNECT CONNECTOR D530 (D536) FROM THE TURBINE INLET OVHT SWITCH, S1 (S4) (WDM 21-63-01).
PUSH THE "TRIP RESET" SWITCH ON THE P5 PANEL. DOES THE "PACK TRIP OFF" LIGHT GO OFF?

NO
YES

33 CONNECT CONNECTOR D530
57 THE SWITCH IS FAILED.
(D536) TO THE TURBINE INLET  FOR THE LEFT PACK: 
OVHT SWITCH, S1 (S4).  REPLACE THE DUCT OVHT SWITCH
 FOR THE LEFT PACK:  FOR THE FLIGHT DECK, S3 
DISCONNECT CONNECTOR D534 FROM (AMM 21-61-51/401). 
THE DUCT OVHT SWITCH FOR THE  FOR THE RIGHT PACK: 
　
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