(2)
APU Operation Test
(3)
APU Engine Start, Acceleration, Operation and Automatic Controls Test
(4)
Fuel Control Unit Governor Speed Test
(5)
Fuel Control Unit Acceleration Limiter Valve Opening Pressure Test
(6)
Bleed Air Valve Opening Rate Test
B. You must do the APU operation test after you replace the APU, the fuel control unit or the bleed air valve.
C. It is not necessary to do the APU engine start, acceleration, operation and automatic controls test after you replace the APU, fuel control unit or bleed air valve. You can use this test for troubleshooting the oil pressure problems of the APU or to do a test for one or more of these components if necessary:
(1)
The electronic speed switch
(2)
The sequencing switch for the oil pressure
(3)
The low pressure switch for the oil
(4)
The fuel solenoid valve
(5)
The oil pump.
D. Tests of the starter motor, igniter plug, ignition unit and combustion chamber are done during the engine start, acceleration, operation and automatic control test.
E. It is not necessary to do the governor speed test for the fuel control unit after you replace the APU, fuel control unit or bleed air valve. You can use this test for troubleshooting and governor speed adjustment of the fuel control unit.
F. It is not necessary to do the opening pressure test for the acceleration limiter valve on the fuel control unit after you replace the APU, fuel control unit or bleed air valve. You can use this test for troubleshooting or cracking pressure adjustment of the fuel control unit.
G. It is not necessary to do the opening rate test for the bleed air valve after you replace the APU, fuel control unit or bleed air valve. You can use this test for troubleshooting or adjustment of the bleed air valve.
TASK 49-11-00-805-001
2. APU Operation Limits
____________________
A. General
(1) The APU operation limits are found in AMM 49-11-00/201. If the APU operation goes above these limits, you must immediately do a shutdown of the APU and correct the problem (AMM 49-00-00/101).
TASK 49-11-00-715-002
3. APU Operation Test (Fig. 501)
__________________
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A SEE B
SEE C
SEE D
SEE E
A
FLIGHT COMPARTMENT
DC AMP METER FREQ METER
DC VOLT
METER
AC
DC SELECTOR
SELECTOR SWITCH
SWITCH
BAT
SWITCH
APU BLEED SWITCH
B C
APU Operation Test
Figure 501 (Sheet 1)
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OR "FAULT" LIGHT
APU Operation Test Figure 501 (Sheet 2)
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
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