YES NO YES
2 DO THE APU USUAL SHUTDOWN
21 DO A CHECK OF THE FUEL
(AMM 49-11-00/201). SENSING FLOW CONTROL VALVE
DO THE FLOW CHECK OF THE (AMM 49-31-92/501). FUEL SUPPLY SYSTEM FOR THE APU DOES THE FLOW CONTROL (AMM 49-31-00/501). VALVE OPERATE CORRECTLY?
SEE SHEET 2 (BLOCK 3)
APU Engine Speed Decreases Too Much When a Bleed Load Is Applied
Figure 121 (Sheet 1)
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1 (BLOCK 2)
YES
YES
3 DO THE APU DRY MOTORING
(AMM 49-11-00/201).
DID A CONTINUOUS FLOW OF FUEL COME FROM THE FUEL LINE FOR THE FUEL ATOMIZER?
FOR THE LOW-PRESSURE FUEL AND FUEL FILTER ELEMENT THE HIGH-PRESSURE FUEL. (AMM 49-31-22/401) AND CLEAN ARE THE FUEL FILTERS THE HIGH-PRESSURE FUEL FILTERCLOGGED?(AMM 49-31-81/301), AS NECESSARY.
NO
IF THE PROBLEM CONTINUES, GO TO BLOCK 5.
NO
5 REPLACE THE FUEL CONTROL
UNIT (AMM 49-31-11/401).
START AND OPERATE THE APU
(AMM 49-11-00/201).
DOES THE PROBLEM CONTINUE?
YES YES
6 DO THE LEAK CHECK FOR THE
CONTROL AIR (AMM 49-11-00/
201).
IS THERE LEAKAGE IN THE CONTROL AIR LINES?
NO
YES
22 DO A CHECK OF THE TEE FITTING ON THE CONTROL AIR LINE.
IS THE TEE FITTING CLOGGED?
NO
APU Engine Speed Decreases Too Much When a Bleed Load Is Applied
Figure 121 (Sheet 2)
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A13028
A 737-300/400/500MAINTENANCE MANUAL
EGT IS TOO HIGH OR PREREQUISITES
OUT OF CONTROL DUR- NONE
ING THE APPLICATION
OF THE BLEED LOAD
POSSIBLE CAUSES:
1.
REGULATOR FOR THE DIFFERENTIAL AIR PRESSURE PROBLEM (AMM 49-52-21/401)
2.
APU CONTROL THERMOSTAT PROBLEM (AMM 49-52-32/401)
3.
CLOGGED TEE FITTING FOR THE CONTROL AIR LINE
4.
3-WAY SOLENOID VALVE PROBLEM (AMM 49-52-61/401)
5.
BLEED AIR VALVE, V56, PROBLEM (AMM 49-52-11/401).
FAULT ISOLATION:
//////////////////////// / GTCP85-129 SERIES / / ENGINES / ////////////////////////
SEE SHEET 2 (BLOCK 2)
EGT Is Too High or Out of Control during the Application of the Bleed Load
Figure 122 (Sheet 1)
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A53610
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FROM SHEET 1 (BLOCK 1)
YES
YES
2
MAKE SURE THE TEE FITTING
52 CLEAN THE TEE FITTING FOR FOR THE CONTROL AIR LINE IS THE CONTROL AIR LINE NOT CLOGGED. (AMM 49-52-91/701) OR REPLACE
THE TEE FITTING.
NOTE:THE ORIFICE OF THE TEE FITTING MUST BE 0.080 TO 0.084 INCH
(2.03 TO 2.13 mm).
IS THE TEE FITTING CLOGGED?
NO NO
3 DO A CHECK OF THE INSTAL-
53 REMOVE AND INSTALL THE
LATION OF THE 3-WAY SOLENOID 3-WAY SOLENOID VALVE OR
VALVE. REPLACE THE VALVE
IS THE 3-WAY SOLENOID (AMM 49-52-61/401). VALVE INSTALLED CORRECTLY?
YES NO
21 DO THE TEST OF THE APU
54 ADJUST THE APU CONTROL CONTROL THERMOSTAT THERMOSTAT (AMM 49-52-32/501). (AMM 49-52-32/501). IF THE APU CONTROL THERMO-
IS THE SET POINT FOR THE STAT WILL NOT CORRECTLY APU CONTROL THERMOSTAT BETWEENADJUST, REPLACE THE THERMOSTAT 620-649`C? (AMM 49-52-32/401).
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