POSSIBLE CAUSES:
1.
BLEED AIR VALVE, V56, PROBLEM (AMM 49-52-11/401)
2.
LEAKAGE FROM THE BLEED AIR DUCT
3.
LEAKAGE FROM THE PRESSURE LINE FOR THE CONTROL AIR
4.
APU CONTROL THERMOSTAT PROBLEM (AMM 49-52-32/401)
5.
APU INTERNAL DAMAGE (AMM 49-11-00/401).
FAULT ISOLATION:
(AMM 49-11-00/201). (AMM 49-11-00/201).
SET THE "APU BLEED" SWITCH DO THIS PROCEDURE:
ON THE P5 FORWARD OVERHEAD BLEED AIR VALVE DOES NOT OPEN
PANEL TO THE "ON" POSITION. IN LESS THAN 12 TO 14 SECONDS
MAKE SURE THE BLEED AIR (FIG. 120).
VALVE OPENS IN LESS THAN 12
TO 14 SECONDS.
DID THE BLEED AIR VALVE
OPEN IN LESS THAN 12 TO 14
SECONDS?
SEE SHEET 2 SEE SHEET 2 (BLOCK 23) (BLOCK 22)
Bleed Air for Main Engine Start Is Not Sufficient Figure 123 (Sheet 1)
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FROM SHEET 1 FROM SHEET 1 (BLOCK 4) (BLOCK 21)
DECREASE TOO MUCH WHEN THE PNEUMATIC LOAD WAS APPLIED TO THE APU?
ENGINE SPEED DECREASES TOO MUCH WHEN A BLEED LOAD IS APPLIED (FIG. 121).
Bleed Air for Main Engine Start Is Not Sufficient
Figure 123 (Sheet 2)
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A13069
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
BLEED AIR FOR MAIN PREREQUISITES
ENGINE START IS NOT MAKE SURE THIS SYSTEM WILL OPERATE:
SUFFICIENT APU (AMM 49-11-00/201)
POSSIBLE CAUSES:
1.
BLEED AIR VALVE, V56, PROBLEM (AMM 49-52-11/401)
2.
LEAKAGE FROM THE BLEED AIR DUCT
3.
LEAKAGE FROM THE PRESSURE LINE FOR THE CONTROL AIR
4.
PROPORTIONAL CONTROL VALVE PROBLEM (AMM 49-52-31/401)
5.
ELECTRONIC TEMPERATURE CONTROL, M1459, PROBLEM (AMM 49-61-71/401)
6.
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 OVERHEAD AIR VALVE DOES NOT OPEN IN PANEL TO THE "ON" POSITION. LESS THAN 12 TO 14 SECONDS
MAKE SURE THE BLEED AIR (FIG. 120). VALVE OPENS IN LESS THAN 12 TO 14 SECONDS.
DID THE BLEED AIR VALVE OPEN IN LESS THAN 12 TO 14SECONDS?
YES YES
2 DO THE LEAK CHECK FOR THE
CONTROL AIR (AMM 49-11-00/
201).
IS THERE LEAKAGE IN THE CONTROL AIR LINES?
NO YES
3 DO THE APU OPERATIONAL
53 DO THE TROUBLESHOOTING OF TEST FOR THE BLEED AIR CONTROLTHE BLEED AIR CONTROL SYSTEM
SYSTEM (AMM 36-11-05/501). TO FIND THE LEAKAGE
IS THERE LEAKAGE FROM THE (AMM 36-11-05/101). BLEED AIR DUCT?
NO NO NO
4 DO THE APU OPERATIONAL 21 ADJUST THE ELECTRONIC 54 REPLACE THE ELECTRONIC
TEST (AMM 49-11-00/501). TEMPERATURE CONTROL TEMPERATURE CONTROL, M1459
WHEN THE APU WAS FULLY (AMM 49-61-71/501). (AMM 49-61-71/401). LOADED, WAS THE EGT IN THE DID THE ELECTRONIC TEM-IF THE PROBLEM CONTINUES, SPECIFIED LIMITS? PERATURE CONTROL ADJUST TO THEREPLACE THE APU
EGT CORRECTLY? (AMM 49-11-00/401).
YES
YES
SEE SHEET 2
(BLOCK 23) SEE SHEET 2
(BLOCK 22)
Bleed Air for Main Engine Start Is Not Sufficient
Figure 123A (Sheet 1)
E06080
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