(AMM 49-31-81/301).
IS THE FILTER CLOGGED?
NO NO4 DO THE FLOW CHECK OF THE FUEL SUPPLY SYSTEM TO THE APU
(AMM 49-31-00/501).
IS THE FUEL FLOW SUFFI-CIENT?
YES
YES
5 DO A CHECK OF THE PRESSURE LINES BETWEEN THE COMPRESSOR
TO THE FUEL CONTROL UNIT AND
THE FUEL CONTROL UNIT TO THE
3-WAY SOLENOID VALVE.
IS THERE LEAKAGE FROM THE PRESSURE LINES?
NO SEE SHEET 3
(BLOCK 6)
53 REPLACE THE STARTER MOTOR, M161 (AMM 49-41-11/401).
IF THE PROBLEM CONTINUES, REPLACE THE APU (AMM 49-11-00/401).
APU Engine Accelerates Slowly or the APU Engine Speed Does Not Get to 100%
Figure 115 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT THE ETC ú
49-00-00
ú ú 02 Page 171 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 2 (BLOCK 5)
APU Engine Accelerates Slowly or the APU Engine Speed Does Not Get to 100%
Figure 115 (Sheet 3)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT THE ETC ú
49-00-00
ú ú 02 Page 172 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A13980
FROM SHEET 3 (BLOCK 24)
APU Engine Accelerates Slowly or the APU Engine Speed Does Not Get to 100%
Figure 115 (Sheet 4)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT THE ETC ú
49-00-00
ú ú 02 Page 173 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A53715
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES
APU ENGINE ACCELER- MAKE SURE THIS SYSTEM WILL OPERATE:
ATES SLOWLY OR THE APU (AMM 49-11-00/201)
APU ENGINE SPEED MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION:
DOES NOT GET TO 100% ELECTRICAL POWER IS ON (AMM 24-22-00/201)
POSSIBLE CAUSES:
1.
THE APU CONTROL UNIT, M280, HAD POWER APPLIED WHEN THE APU WAS REMOVED AND INSTALLED.
2.
THE APU CONTROL UNIT, M280, HAD POWER APPLIED WHEN THE EGT THERMOCOUPLES ARE REMOVED AND INSTALLED, OR WHEN THE EGT THERMOCOUPLE CIRCUITS HAVE AN INTERMITTENT FAULT.
3.
APU BATTERY PROBLEM (AMM 24-31-11/201)
4.
CLOGGED FILTER ELEMENT FOR THE LOW-PRESSURE FUEL (AMM 49-31-22/401)
5.
CLOGGED FILTER FOR THE HIGH-PRESSURE FUEL (AMM 49-31-81/301)
6.
STARTER MOTOR, M161, PROBLEM (AMM 49-41-11/401)
7.
LEAKAGE FROM THE CONTROL AIR LINES
8.
FUEL CONTROL UNIT PROBLEM (AMM 49-31-11/401)
9.
BLEED AIR VALVE, V56, PROBLEM (AMM 49-52-11/401)
10.
COMBUSTOR UNIT PROBLEM (AMM 49-31-42/401)
11.
PROPORTIONAL CONTROL VALVE PROBLEM (AMM 49-52-31/401)
12.
ELECTRONIC TEMPERATURE CONTROL, M1459, PROBLEM (AMM 49-61-71/401)
13.
TEMPERATURE SENSOR, T2, FOR THE COMPRESSOR INLET PROBLEM (AMM 49-61-32/401)
14.
ETC THERMOCOUPLE PROBE PROBLEM (AMM 49-71-31/401)
15.
CLOGGED TEE FITTING FOR THE CONTROL AIR LINE
16.
3-WAY SOLENOID VALVE PROBLEM (AMM 49-52-61/401)
17.
APU INTERNAL DAMAGE (AMM 49-11-00/401)
FAULT ISOLATION:
YES
1 WAS POWER APPLIED TO THE
APU CONTROL UNIT, M280, WHEN
THE APU WAS REMOVED AND
INSTALLED?
NO YESYES
2 WAS POWER APPLIED TO THE
21 DO A CONTINUITY CHECK
APU CONTROL UNIT, M280, WHEN FROM PIN 1 AND PIN 2, AT THE
THE EGT THERMOCOUPLES WERE CONNECTOR D10114, ON THE EGT
DISCONNECTED? THERMOCOUPLE 1 (WDM 49-71-01).
DO A CONTINUITY CHECK
NO
FROM PIN 3 AND PIN 4, AT THE
CONNECTOR D10114, ON THE EGT SEE SHEET 2 THERMOCOUPLE 2 (WDM 49-71-01). (BLOCK 3) ARE THE CIRCUITS
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