6.
CLEARANCE PROBLEM BETWEEN THE COOLING FAN FLANGE AND THE SEAL FOR THE COOLING AIR DUCT (AMM 49-11-00/401)
7.
CLOGGED OIL FILTER ELEMENT (AMM 49-91-12/401)
8.
CLOGGED FILTER IN THE PNEUMATIC LINE FOR THE SHUTOFF VALVE (AMM 49-51-22/401)
9.
PNEUMATIC ACTUATOR PROBLEM (AMM 49-51-32/401)
10.
OIL TEMPERATURE SWITCH PROBLEM (AMM 49-94-21/401)
11.
OIL COOLER PROBLEM (AMM 49-91-41/401)
12.
COOLING FAN PROBLEM (AMM 49-51-11/401)
13.
APU INTERNAL DAMAGE (AMM 49-11-00/401)
14.
P5-4 MODULE FOR THE FORWARD OVERHEAD PANEL PROBLEM (WDM 49-41-01).
FAULT ISOLATION:
NO
1 DO A TEST OF THE SHUTOFF
VALVE FOR THE COOLING AIR
(AMM 49-51-21/501).
DOES THE SHUTOFF VALVE OPERATE CORRECTLY?
YES YES
2 DO A CHECK OF THE PRESSURE
LINE TO THE SHUTOFF VALVE FOR
LEAKAGE.
IS THERE LEAKAGE FROM THE PRESSURE LINE?
NO SEE SHEET 2
(BLOCK 3)
Automatic Shutdown - HIGH OIL TEMP or FAULT Light Is On
Figure 137 (Sheet 1)
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FROM SHEET 1 (BLOCK 2)
NO
YES
3
DO A CHECK FOR BLOCKAGE
OF THE INLET SCREEN FOR THE
COOLING FAN (AMM 49-51-00/
201).
IS THERE BLOCKAGE OF THE INLET SCREEN?
NO
YES3B DO A CHECK FOR NO CLEAR-
ANCE BETWEEN THE COOLING FAN
FLANGE AND THE SEAL FOR THE
COOLING AIR DUCT.
IS THERE A CLEARANCE BETWEEN THE COOLING FAN FLANGE AND THE SEAL?
YES
YES
YES
6 DO A CHECK OF THE OIL FILTER ELEMENT (AMM 49-91-12/
401).
IS THE FILTER ELEMENT CLOGGED?
NO
SEE SHEET 3 (BLOCK 7) SEE SHEET 5 (BLOCK 25)
YES
NO
Automatic Shutdown - HIGH OIL TEMP or FAULT Light Is On
Figure 137 (Sheet 2)
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FROM SHEET 2 (BLOCK 6)
FROM THE OIL TEMPERATURE (AMM 49-11-00/201). SWITCH. CONNECT CONNECTOR D1260 START AND OPERATE THE APU TO THE OIL TEMPERATURE SWITCH.(AMM 49-11-00/201). REPLACE THE P5-4 MODULE
DID THE "HIGH OIL TEMP" ON THE FORWARD OVERHEAD PANEL LIGHT OR "FAULT" LIGHT COME (WDM 49-41-01).ON?
NO
NO
YES
NO
9 DOES THE APU HAVE ALLIED-SIGNAL SB GTCP85-49-7096?
YES
SEE SHEET 4 (BLOCK 10)
22 DO THE APU USUAL SHUTDOWN (AMM 49-11-00/201).
DO A CHECK OF THE FILTER IN THE PNEUMATIC LINE FOR THESHUTOFF VALVE (AMM 49-51-22/ 401).
IS THE FILTER CLOGGED?
YES
NO
Automatic Shutdown - HIGH OIL TEMP or FAULT Light Is On
Figure 137 (Sheet 3)
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FROM SHEET 3 (BLOCK 9)
401). DOES THE PROBLEM CONTINUE?
YES
Automatic Shutdown - HIGH OIL TEMP or FAULT Light Is On
Figure 137 (Sheet 4)
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