THE BLEED AIR CONTROL SYSTEM TO FIND LEAKAGE (AMM 36-11-05/ 101).
EGT Is Greater Than 430`C With a 50 to 100 Amp Electrical Load and the APU Bleed Switch Is in the ON Position (Air Conditioning Packs are Closed) Figure 133
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PREREQUISITES
EGT IS GREATER THAN NONE
649`C DURING THE APU
OPERATION
POSSIBLE CAUSES:
1.
DIFFERENTIAL PRESSURE REGULATOR PROBLEM (AMM 49-52-21/401)
2.
BLEED AIR VALVE, V56, PROBLEM (AMM 49-52-11/401)
3.
APU CONTROL THERMOSTAT PROBLEM (AMM 49-52-32/401).
FAULT ISOLATION:
51 ADJUST THE DIFFERENTIAL
PRESSURE REGULATOR
(AMM 49-52-21/501).
IF THE DIFFERENTIAL PRES-SURE REGULATOR CANNOT BE ADJUSTED, REPLACE THE REGULA-TOR (AMM 49-52-21/401).
YES
EGT Is Greater Than 649`C during the APU Operation
Figure 134
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PREREQUISITES
EGT IS GREATER THAN NONE
649`C DURING THE APU
OPERATION
POSSIBLE CAUSES:
1.
DIFFERENTIAL PRESSURE REGULATOR PROBLEM (AMM 49-52-21/401)
2.
BLEED AIR VALVE, V56, PROBLEM (AMM 49-52-11/401)
3.
PROPORTIONAL CONTROL VALVE PROBLEM (AMM 49-52-31/401).
FAULT ISOLATION:
EGT Is Greater Than 649`C during the APU Operation
Figure 134A
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E05801
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES
EGT IS GREATER THAN MAKE SURE THIS SYSTEM WILL OPERATE:
760`C APU (AMM 49-11-00/201)
POSSIBLE CAUSES:
1.
APU INTERNAL DAMAGE (AMM 49-11-00/401)
2.
EGT INDICATOR, N24, PROBLEM (WDM 49-71-01).
FAULT ISOLATION:
YES
1 START AND OPERATE THE APU
51 DO THE APU USUAL SHUTDOWN (AMM 49-11-00/201). (AMM 49-11-00/201).
DID THE EGT INDICATOR DO THE INSPECTION OF THE SHOW A TEMPERATURE OF 760`CAPU (AMM 49-11-00/601).OR GREATER DURING THE APU IF INTERNAL DAMAGE IS START? FOUND, REPLACE THE APU
(AMM 49-11-00/401). NO
IF THE DAMAGE CAN BE REPAIRED, REPAIR THE DAMAGE THAT YOU FIND.
YES
2 DID THE EGT INDICATOR SHOW
52 REPLACE THE APU
A TEMPERATURE OF 760`C OR
(AMM 49-11-00/401). GREATER DURING THE APU
OPERATION?
EGT Is Greater Than 760`C
Figure 135
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AUTOMATIC SHUTDOWN PREREQUISITES
FOR A LOW OIL PRES- MAKE SURE THIS SYSTEM WILL OPERATE:
SURE OR THE "LOW OIL APU (AMM 49-11-00/201)
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