POSSIBLE CAUSES:
1.
A WIND AT THE REAR OF THE AIRPLANE BLEW THE EXHAUST GASES INTO THE APU AIR INLET

2.
THE EXHAUST GASES FROM A DIFFERENT AIRPLANE BLEW INTO THE APU AIR INLET

3.
FLUID FOR THE ICE REMOVAL WENT INTO THE APU AIR INLET

4.
CLOGGED FITTING FOR THE VENT LINE OF THE OIL TANK AT THE EXHAUST PORT (AMM 49-91-61/601)

5.
CLOGGED FUEL DRAIN (AMM 49-31-71/601)

6.
APU INTERNAL DAMAGE (AMM 49-11-00/401).

FAULT ISOLATION:
YES

1 WAS FLUID FOR ICE REMOVAL
51 MAKE SURE THIS CONDITION USED NEAR THE AIR INLET DOOR DOES NOT OCCUR WHEN YOU BEFORE OR DURING THE APU OPERATE THE APU AGAIN. OPERATION? DO THIS TASK: REMOVAL OF
OIL CONTAMINATION FROM THE AIRNO
CONDITIONING AND PNEUMATIC SYSTEM (AMM 21-00-01/201)
YES

52 REPLACE THE APU (AMM 49-11-00/401). DO THIS TASK: REMOVAL OF
NO
OIL CONTAMINATION FROM THE AIR CONDITIONING AND PNEUMATIC SYSTEM (AMM 21-00-01/201)
NOYES
21 DO A CHECK OF THE FITTING
53 REPLACE THE APU FOR THE VENT LINE OF THE OIL
(AMM 49-11-00/401). TANK AT THE EXHAUST PORT DO THIS TASK: REMOVAL OF
NO
(AMM 49-91-61/601). OIL CONTAMINATION FROM THE AIR
IS THE FITTING CLOGGED? CONDITIONING AND PNEUMATIC SEE SHEET 2 SYSTEM (AMM 21-00-01/201) (BLOCK 4)

CLEAN THE FITTING FOR THE VENT LINE OF THE OIL TANK (AMM 49-91-61/601).
DO THIS TASK: REMOVAL OFOIL CONTAMINATION FROM THE AIRCONDITIONING AND PNEUMATIC SYSTEM (AMM 21-00-01/201)
Fumes or Smoke in the Cabin
Figure 129 (Sheet 1)

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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1 (BLOCK 3)
NO
YES
YES

22 A WIND AT THE REAR OF THE
55 MAKE SURE THIS CONDITION AIRPLANE CAN BLOW THE APU DOES NOT OCCUR WHEN YOU EXHAUST GASES INTO THE APU AIR OPERATE THE APU AGAIN.
NO
DO THIS TASK: REMOVAL OF WAS THERE A WIND AT THE OIL CONTAMINATION FROM THE AIRSEE SHEET 3 REAR OF THE AIRPLANE DURING CONDITIONING AND PNEUMATIC (BLOCK 5)
INLET.
THE APU OPERATION?  SYSTEM (AMM 21-00-01/201)

NO
YES

23 EXHAUST GASES FROM A 56 MAKE SURE THIS CONDITION
DIFFERENT AIRPLANE CAN BLOW DOES NOT OCCUR WHEN YOU INTO THE APU AIR INLET. OPERATE THE APU AGAIN. DID THIS OCCUR DURING THE DO THIS TASK: REMOVAL OF APU OPERATION? OIL CONTAMINATION FROM THE AIRCONDITIONING AND PNEUMATIC

NO
SYSTEM (AMM 21-00-01/201)
YES

24 START THE APU
57 DO THE APU USUAL SHUTDOWN (AMM 49-11-00/201). (AMM 49-11-00/201). DOES THE PROBLEM THE SYSTEM IS OK. CONTINUE?
 DO THIS TASK: REMOVAL OF OIL CONTAMINATION FROM THE AIR
YES
CONDITIONING AND PNEUMATIC SYSTEM (AMM 21-00-01/201)

58 DO THE APU USUAL SHUTDOWN (AMM 49-11-00/201).
REPLACE THE APU (AMM 49-11-00/401).
 DO THIS TASK: REMOVAL OF OIL CONTAMINATION FROM THE AIRCONDITIONING AND PNEUMATIC SYSTEM (AMM 21-00-01/201)
Fumes or Smoke in the Cabin
Figure 129 (Sheet 2)

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A13361
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1
(BLOCK 3)
NO

NO YES
5
THERE ARE FUMES IN THE

59 CLEAN OR REPLACE THE FUELCABIN FROM FUEL THAT IS NOT
DRAIN (AMM 49-31-71/601).
BURNED.

DO THIS TASK: REMOVAL OF
WET MOTOR THE APU

OIL CONTAMINATION FROM THE AIR
NO
(AMM 49-11-00/201).  CONDITIONING AND PNEUMATIC
DOES THE UNWANTED FUEL SYSTEM (AMM 21-00-01/201)
IN THE COMBUSTION CHAMBER
DRAIN THROUGH THE FUEL DRAIN?

YES 60 REPLACE THE APU (AMM 49-11-00/401).
 DO THIS TASK: REMOVAL OF OIL CONTAMINATION FROM THE AIR CONDITIONING AND PNEUMATIC SYSTEM (AMM 21-00-01/201)
NO

26 START THE APU61 DO THE APU USUAL SHUTDOWN (AMM 49-11-00/201). (AMM 49-11-00/201). DOES THE PROBLEM THE SYSTEM IS OK. CONTINUE? DO THIS TASK: REMOVAL OF OIL CONTAMINATION FROM THE AIRYES
　
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