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EXAMINE THE AIR LINES ON THE BLEED AIR VALVE AND THEAIR LINE FROM THE BLEED AIR VALVE TO THE APU CONTROL THERMOSTAT (AIRPLANES WITHOUT THE ELECTRONIC TEMPERATURE CONTROL) OR TO THE PROPOR-TIONAL CONTROL VALVE (AIRPLANES WITH THE ELECTRONIC TEMPERATURE CONTROL).
LOOK FOR LOOSE NUTS AND DAMAGE THAT CAN CAUSE AIRLEAKAGE.
ARE LOOSE NUTS OR DAMAGE FOUND?
NO
NO
YES

9 DO A TEST OF THE DIFFEREN-

25 DO A CHECK OF THE FILTER
64 CLEAN OR REPLACE THE
TIAL PRESSURE REGULATOR FOR THE DIFFERENTIAL PRESSURE FILTER FOR THE DIFFERENTIAL (AMM 49-52-21/501). REGULATOR (AMM 49-52-21/301). PRESSURE REGULATOR
IS THE PRESSURE FROM THE IS THE FILTER CLOGGED? (AMM 49-52-21/301). DIFFERENTIAL PRESSURE
NO
REGULATOR 18.5-19.5 PSIG (127.5-134.4 kPa)?

YES

SEE SHEET 5 (BLOCK 26)
Bleed Load Cannot Be Applied When the APU Engine Speed Is 100 Percent
Figure 119 (Sheet 4)

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FROM SHEET 4 (BLOCK 9) YES

SWITCHING MODULE, M278 (AMM 52-71-31/401).
Bleed Load Cannot Be Applied When the APU Engine Speed Is 100 Percent
Figure 119 (Sheet 5)

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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
BLEED AIR VALVE  PREREQUISITES 
DOES NOT OPEN IN  MAKE SURE THESE SYSTEMS WILL OPERATE: 
LESS THAN 12 TO 14  PNEUMATIC (AMM 36-05-00/201) 
SECONDS  APU (AMM 49-11-00/201)

POSSIBLE CAUSES:
1.
CLOGGED FILTER FOR THE DIFFERENTIAL PRESSURE REGULATOR (AMM 49-52-21/301)

2.
BLEED AIR VALVE, V56, PROBLEM (AMM 49-52-11/401).

FAULT ISOLATION:
1
FOR THE DIFFERENTIAL PRESSURE
REGULATOR (AMM 49-52-21/301).

 

2
FOR THE BLEED AIR VALVE TO
ADJUST THE RATE CONTROL SCREW
(AMM 49-11-00/501).

BE ADJUSTED?

Bleed Air Valve Does Not Open in Less Than 12 to 14 Seconds
Figure 120

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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
APU ENGINE SPEED  PREREQUISITES
DECREASES TOO MUCH  MAKE SURE THIS SYSTEM WILL OPERATE: 
WHEN A BLEED LOAD  APU (AMM 49-11-00/201) 
IS APPLIED 

POSSIBLE CAUSES:
1.
FUEL CONTROL UNIT PROBLEM (AMM 49-31-11/401)

2.
CLOGGED FILTER ELEMENT FOR THE LOW-PRESSURE FUEL (AMM 49-31-22/401)

3.
CLOGGED FILTER FOR THE HIGH-PRESSURE FUEL (AMM 49-31-81/301)

4.
COMBUSTOR UNIT PROBLEM (AMM 49-31-42/401)

5.
FLOW CONTROL VALVE PROBLEM (AMM 49-31-92/401)

6.
CLOGGED TEE FITTING ON THE PRESSURE LINE FOR THE COMPRESSOR DISCHARGE

7.
BLEED AIR VALVE, V56, PROBLEM (AMM 49-52-11/401)

8.
APU FUEL VALVE, V43, PROBLEM (AMM 28-22-31/401)

9.
APU INTERNAL DAMAGE (AMM 49-11-00/401).

FAULT ISOLATION:
NO

1 START AND OPERATE THE APU
51 DO THE APU USUAL SHUTDOWN
(AMM 49-11-00/201). (AMM 49-11-00/201).
SET THE "APU BLEED" SWITCH DO THIS PROCEDURE: BLEED ON THE P5 FORWARD OVERHEADAIR VALVE DOES NOT OPEN INPANEL TO THE "ON" POSITION. LESS THAN 12 TO 14 SECONDS
MAKE SURE THE BLEED AIR (FIG. 120). VALVE OPENS IN LESS THAN 12 TO14 SECONDS.
　
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