NOTE : Before you do the pre-conditioning with the APU, make sure that
____ the external area around of the APU air intake and the diverter is clean. Make sure that no exhaust gases from main engines and/or ground support equipment go into the APU air intake during the pre-conditioning.
 NOTE : If the APU did operate during fluid de-icing operations, it can be
____ that the APU Inlet and the APU compressors are contaminated. Then do the cleaning and testing as given in the Para. 4.C. before you do the fault confirmation.
 4. Fault Isolation
_______________
 **ON A/C 001-003, 051-058,
 A. If you smell fumes in the cabin during the pre-conditioning with the APU and there is no oil smoke on the exhaust during the operation of the APU.
 NOTE : Do the cleaning and testing as given in the Para. 4.C. after each
____ repair step during the fault isolation. If you fail to do this, the fault may continues.
 - examine the outer and inner surfaces and the flexible seals on the air intake diffuser and elbow and make sure that they are clean,

 - examine the surfaces of the air intake diverter and the air inlet duct and make sure that they are clean,

 - examine the surfaces and the flexible seals of the APU access doors and make sure that they are clean.

 NOTE : Do the checks with a black light lamp.
____ Make sure that there is no contamination of oil, fuel, grease, other unwanted material and/or remaining signs of contamination.
 (1) If there is contamination of oil, fuel or grease on the outer and/or inner surfaces of the air intake system components and/or the APU access doors:
 - identify the type of contamination and the area of the source,

 - examine the plumbing/tubing and the APU component interfaces in that area for leaks.

 NOTE : If necessary, do the checks with a black light lamp.
____
 Do the check very carefully on the:

 - OIL COOLER,
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-003, 051-099, 401-499, ∞∞49-00-00∞∞∞∞∞∞∞∞∞∞Page A229
 Config-1 Aug 01/05 CES - oil filler cap and scupper,

 - pressure fill and overflow ports,

 - OIL PUMP ASSY,

 - APU GENERATOR (8XS),

 - FUEL CONTROL UNIT P19,

 - INLET GUIDE-VANE ACTUATOR P21.

 NOTE : If you cannot identify the leak(s) when the APU does not
____ operate:
 - start and operate the APU with no bleed air supply and no APU generator load (Ref. AMM TASK 49-00-00-710-004),

 - let the APU operate for 15 minutes for thermal stabilazation,

 - do a leak check on the APU with a black light lamp,

 - do the APU shutdown (Ref. AMM TASK 49-00-00-710-004),

 - immediately after the APU has stopped, examine the APU carefully with a black light lamp to identify the leak(s).

 (a) Disconnect the Load Compressor Drain-Line and proof for oil presence.

 - If there is leak of the Load Compressor Seal detected replace the APU (Ref. AMM TASK 49-11-11-000-001) and (Ref. AMM TASK 49-11-11-400-001).

 (b) If there is a leak on the plumbing/tubing:

 - do the repair and replace the tubes, the connectors and the seals as necessary.

 (c) If there is oil leakage in the area of the cooling fan:

 - replace the seals and/or the COOLING FAN (Ref. AMM TASK 49-52-51-000-001) and (Ref. AMM TASK 49-52-51-400-001) as necessary.

 (d) Remove the cooling-fan discharge-duct (Ref. AMM TASK 49-52-51-000-001) and examine if there is oil contamination inside the duct. If there is oil contamination inside cooling-fan discharge duct and the inside of the APU inlet plenum is clean:

 - do a further inspection of the cooling fan.

 (e) If there is oil leakage in the area of the oil cooler:

 - replace the seals at the connectors and the interface between the oil cooler and the thermal by-pass valve, and/or the OIL COOLER (Ref. AMM TASK 49-91-44-000-001) and (Ref. AMM TASK 49-91-44-400-001), and/or the THERMAL BY-PASS VALVE (Ref. AMM TASK 49-91-44-000-002) and (Ref. AMM TASK 49-91-44-400-002), as necessary.

 (f) If there is oil in the scupper of the gravity fill port or the scupper is wet from oil:

 NOTE : It is possible that the oil scupper was not made dry
____ correctly after the last oil servicing and the oil which was filled in too much has stayed in the scupper.
 - if the oil level in the oil reservoir is above the FULL mark on the oil sight glass, correct it with the overflow drain tool (Ref. AMM TASK 49-90-00-600-001).

 - make sure that the oil filler cap and the seal are the correct condition and replace them if necessary,
　
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