POSSIBLE CAUSES:
1.
THE OIL LEVEL IS TOO LOW (AMM 12-13-31/301)
2.
OIL PUMP FILTER IS CLOGGED (AMM 49-91-12/401)
3.
SWITCH FOR THE LOW OIL PRESSURE PROBLEM (AMM 49-61-51/401)
4.
OIL PUMP PROBLEM (AMM 49-91-11/401)
5.
ADJUSTMENT OF THE PRESSURE REGULATOR VALVE (AMM 49-91-11/501)
6.
APU CONTROL UNIT, M280, PROBLEM (AMM 49-61-11/401)
7.
APU INTERNAL DAMAGE (AMM 49-11-00/401).
FAULT ISOLATION:
LEVEL FOR THE APU AS NECESSARY (AMM 12-13-31/ (AMM 12-13-31/301). 301). IS THE OIL LEVEL LOW? IF THE PROBLEM CONTINUES, GO TO BLOCK 2.
NOYES NO
2 DO A CHECK OF THE OIL PUMP
52 REPLACE THE ELEMENT OF THE FILTER (AMM 49-91-12/401).
OIL PUMP FILTER
IS THE OIL PUMP FILTER
(AMM 49-91-12/401).
YES
CLOGGED?
IF THE PROBLEM CONTINUES, GO TO BLOCK 2A.
NO
SEE SHEET 2
(BLOCK 2A)
Automatic Shutdown for a Low Oil Pressure or the LOW OIL PRESSURE Light Stays on and
the APU Engine Stops Approximately 10 Seconds After 100% Speed
Figure 136 (Sheet 1)
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FROM SHEET 1 (BLOCK 2)
Automatic Shutdown for a Low Oil Pressure or the LOW OIL PRESSURE Light Stays on and
the APU Engine Stops Approximately 10 Seconds After 100% Speed
Figure 136 (Sheet 2)
F11667
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FROM SHEET 2
(BLOCK 2A)
YES
NO NO
3
START AND OPERATE THE APU
22 DO THE APU USUAL SHUTDOWN
(AMM 49-11-00/201). (AMM 49-11-00/201).
DO A CHECK OF THE OIL REPLACE THE SWITCH FOR THE
PRESSURE. LOW OIL PRESSURE
IS THE OIL PRESSURE LESS(AMM 49-61-51/401).
THAN 50 PSI? DOES THE PROBLEM CONTINUE?
____THE SWITCH FOR THE LOW
NOTE: OIL PRESSURE IS SET TO 50 PSI TO STOP THE APU AND TURN ON THE LOW OIL
PRESSURE LIGHT. IF THE OIL PRESSURE DROPS BELOW 50 PSI, THEN THE PRESSURE REGULATOR VALVE MUST BE ADJUSTED TO 95 |5 PSI.
YES
NO
4 DO THE APU USUAL SHUTDOWN
(AMM 49-11-00/201).
DO A CHECK OF THE PRESSURE
REGULATOR VALVE.
IS THE PRESSURE REGULATOR
VALVE ADJUSTED CORRECTLY?
Automatic Shutdown for a Low Oil Pressure or the LOW OIL PRESSURE Light Stays on and
the APU Engine Stops Approximately 10 Seconds After 100% Speed
Figure 136 (Sheet 3)
A13759
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AUTOMATIC SHUTDOWN - PREREQUISITES
"HIGH OIL TEMP" MAKE SURE THIS SYSTEM WILL OPERATE:
OR "FAULT" LIGHT APU (AMM 49-11-00/201)
IS ON
POSSIBLE CAUSES:
1.
OIL LEVEL IN OIL TANK IS TOO LOW (AMM 12-13-31/301)
2.
SHUTOFF VALVE FOR THE COOLING AIR PROBLEM (AMM 49-51-21/401)
3.
LEAKAGE FROM THE PRESSURE LINE TO THE SHUTOFF VALVE
4.
BLOCKAGE OF THE INLET SCREEN FOR THE COOLING FAN (AMM 49-51-00/201)
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