(3) If there is no external contamination:
- if the oil level in the oil reservoir is above the FULL mark on the oil sight glas, correct it with the overflow drain tool (Ref. AMM TASK 49-90-00-600-001).
NOTE : If the APU oil reservoir was filled above the FULL mark on the
____ oil sight glass: During APU operation the oil expands which could create an over-filled condition, resulting in leakage and possible oil smell in the cabin.
- remove the APU Bleed-Air Duct Elbow (Ref. AMM TASK 49-11-11-000-001),
- remove the Load Control Valve P12 (Ref. AMM TASK 49-51-51-000-001).
- examine the removed components with a black light lamp and make sure that you do not find signs of contamination.
(a) If there are signs of contamination:
- clean the APU Bleed-Air Duct Elbow and install it (Ref. AMM TASK 49-11-11-400-001),
- clean the Load Control Valve P12 and install it (Ref. AMM TASK 49-51-51-400-001).
- do a check of the by-pass valve of the load compressor buffer-air system. If necessary, replace the Load-Compressor Buffer-air Bypass Valve.
1 If the fault continues:
_
- replace the seals on the turbine bearing cavity vent and lubrication tubes (Ref. AMM TASK 49-91-53-000-001) and (Ref. AMM TASK 49-91-53-400-001).
2 If the fault continues:
_
- replace the AUXILIARY POWER UNIT (4005KM) (Ref. AMM TASK 49-11-11-000-001) and (Ref. AMM TASK 49-11-11-400-001).
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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 (8079KM), - oil filler cap and scupper,
- pressure fill and overflow ports,
- OIL PUMP ASSY (8080KM),
- APU GENERATOR (8XS),
- FUEL CONTROL UNIT (8022KM),
- INLET GUIDE-VANE ACTUATOR (8014KM).
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 stabilization,
- 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).
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(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 (8055KM) (Ref. AMM TASK 49-52-51-000-001) and (Ref. AMM TASK 49-52-51-400-001) as necessary. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 机载辅助动力 1(48)
