61 REPAIR THE PROBLEMS THAT
FROM THE APU CONTROL UNIT, YOU FIND.
M280, CONNECTOR D50B, PIN 4,
TO THE ELECTRONIC SPEED SWITCH, S634, CONNECTOR D1245, PIN A (WDM 49-31-01).
IS THERE AN OPEN CIRCUIT?
NO
SEE SHEET 5(BLOCK 22)
Pressure in the Bleed Air Duct Is Not Constant during the Main Engine Start
Figure 126 (Sheet 4)
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FROM SHEET 4 (BLOCK 11)
IS THE RESISTANCE 4000-6000 OHMS?
Pressure in the Bleed Air Duct Is Not Constant during the Main Engine Start Figure 126 (Sheet 5)
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PREREQUISITES HIGH OIL CONSUMPTION
NONE
POSSIBLE CAUSES:
1.
LEAKAGE FROM A COMPONENT OF THE APU LUBRICATION SYSTEM
2.
DAMAGE TO THE GEARSHAFT SEAL OF THE FUEL CONTROL UNIT (AMM 49-31-12/401)
3.
CLOGGED FITTING FOR THE VENT LINE OF THE OIL TANK AT THE EXHAUST PORT (AMM 49-91-61/601)
4.
CLOGGED FITTING FOR THE VENT LINE OF THE OIL TANK AT THE GEARBOX (AMM 49-91-61/601)
5.
APU INTERNAL DAMAGE (AMM 49-11-00/401).
FAULT ISOLATION:
YES 51 REPLACE THE APU (AMM 49-11-00/401).
NO
YES
NO
YES
NO YES
4 DO A CHECK OF THE FITTINGS
54 CLEAN THE FITTING(S) FOR
FOR THE VENT LINE OF THE OIL THE VENT LINE OF THE OIL TANK
TANK AT THE EXHAUST PORT AND (AMM 49-91-61/601).
THE OIL TANK (AMM 49-91-61/
601).
ARE THE FITTINGS CLOGGED?
NO
High Oil Consumption
Figure 127
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PREREQUISITES SMOKE OR FLAME IN
MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION: THE APU EXHAUST ELECTRICAL POWER IS ON (AMM 24-22-00/201)
POSSIBLE CAUSES:
1.
CLOGGED FITTING FOR THE VENT LINE OF THE OIL TANK AT THE EXHAUST PORT (AMM 49-91-61/601)
2.
OIL TANK HAS TOO MUCH OIL (AMM 49-91-31/301)
3.
CLOGGED FUEL DRAIN (AMM 49-31-71/601)
4.
APU INTERNAL DAMAGE (AMM 49-11-00/401).
FAULT ISOLATION:
YES
NO
YES
2 DO A CHECK OF THE FITTING
FOR THE VENT LINE OF THE OIL
TANK AT THE EXHAUST PORT
(AMM 49-91-61/601).
IS THE FITTING CLOGGED?
NO YES3 IF UNWANTED FUEL IS IN THE
COMBUSTION CHAMBER WHEN YOU
START THE APU, THE FUEL WILL
CAUSE FLAMES IN THE APU
EXHAUST.
DO A CHECK OF THE FUEL DRAIN (AMM 49-31-71/601).
IS THE FUEL DRAIN CLOGGED?
Smoke or Flame in the APU Exhaust
Figure 128
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PREREQUISITES
FUMES OR SMOKE IN THE CABIN APU (AMM 49-11-00/201) MAKE SURE THIS SYSTEM WILL OPERATE:
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