POSSIBLE CAUSES:
PREREQUISITES
MAKE SURE THIS SYSTEM WILL OPERATE: APU (AMM 49-11-00/201)
1.
CLOGGING OF THE FILTER FOR THE DIFFERENTIAL PRESSURE REGULATOR (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:
YES
1 DO A CHECK OF THE FILTER
51 REPLACE THE DIFFERENTIAL FOR THE DIFFERENTIAL PRESSURE PRESSURE REGULATOR
REGULATOR (AMM 49-52-21/301). (AMM 49-52-21/401).
IS THE FILTER CLOGGED?
NO NO
2 REPLACE THE BLEED AIR
VALVE, V56 (AMM 49-52-11/
401).
START AND OPERATE THE APU(AMM 49-11-00/201).
DOES THE PROBLEM CONTINUE?
(AMM 49-11-00/201).
REPLACE THE PROPORTIONAL CONTROL VALVE (AMM 49-52-31/401).
EGT Is Less Than the Operator's EGT Set-Point or 566`C with
Both Air Conditioning Packs in the ON Position
Figure 131A
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES
EGT IS GREATER THAN
MAKE SURE THIS SYSTEM WILL OPERATE:
370`C FOR THE NO
APU (AMM 49-11-00/201)
LOAD CONDITION OR
MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION:
GREATER THAN 430`C
ELECTRICAL POWER IS ON (AMM 24-22-00/201)
WITH A 50 TO 100 AMP ELECTRICAL LOAD
POSSIBLE CAUSES:
1.
APU AIR INLET IS BLOCKED
2.
BLEED AIR SWITCH IN THE "ON" POSITION
3.
BLEED AIR VALVE, V56, PROBLEM (AMM 49-52-11/401)
4.
SURGE BLEED VALVE PROBLEM (AMM 49-52-41/401)
5.
LEAKAGE FROM THE BLEED AIR DUCT
6.
BLEED AIR SWITCH PROBLEM (WDM 49-31-01)
7.
APU CONTROL UNIT, M280, PROBLEM (AMM 49-61-11/401)
8.
EGT INDICATOR, N24, PROBLEM (WDM 49-71-01)
9.
APU INTERNAL DAMAGE (AMM 49-11-00/401).
FAULT ISOLATION:
EGT Is Greater Than 370`C for the No Load Condition or Greater Than 430`C with a 50 to 100 Amp Electrical Load Figure 132 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1 (BLOCK 3)
EGT Is Greater Than 370`C for the No Load Condition or Greater Than 430`C with a
50 to 100 Amp Electrical Load
Figure 132 (Sheet 2)
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ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
PREREQUISITES
MAKE SURE THIS SYSTEM WILL OPERATE:
EGT IS GREATER THAN APU (AMM 49-11-00/201)
430`C WITH A 50 TO MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION:
100 AMP ELECTRICAL ELECTRICAL POWER IS ON (AMM 24-22-00/201)
LOAD AND THE APU
BLEED SWITCH IS IN
THE "ON" POSITION
(AIR CONDITIONING
PACKS ARE CLOSED)
POSSIBLE CAUSES:_______________
APU CONTROL UNIT, M280, PROBLEM (AMM 49-61-11/401) EGT INDICATOR, N24, PROBLEM (WDM 49-71-01) APU INTERNAL DAMAGE (AMM 49-11-00/401). APU AIR INLET BLOCKED LEAKAGE FROM THE BLEED AIR DUCT 1. 2. 3. 4. 5. 6. 7. BLEED AIR VALVE, V56, PROBLEM (AMM 49-52-11/401) SURGE BLEED VALVE PROBLEM (AMM 49-52-41/401)
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