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,
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- 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 49-00-00-710-010),
- 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 49-00-00-710-010),
- immediately after the APU has stopped, examine the APU carefully with a black light lamp to identify the leak(s).
(a) If there is presence of oil at the Load Compressor Cavity drain.
- replace the APU (Ref. AMM TASK 49-11-11-000-004) and (Ref. AMM TASK 49-11-11-400-004).
(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 49-52-51-000-002) and (Ref. AMM TASK 49-52-51-400-002) as necessary.
(d) Remove the cooling-fan discharge-duct (Ref. AMM TASK 49-52-51-000-002) 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 pump assy:
- replace the seals and or the OIL PUMP ASSY as necessary (Ref. AMM TASK 49-91-45-000-003) and (Ref. AMM TASK 49-91-45-400-003).
(f) If there is oil leakage in the area of the APU generator:
- replace the SEALING PLATE and/or the APU GENERATOR (8XS) (Ref. AMM TASK 24-23-51-000-001) and (Ref. AMM TASK 24-23-51-400-001), as necessary.
(g) If there is oil leakage in the area of the lupe pump filter and/or the generator scavenge filter:
- replace the packing of the related filter housing (Ref. AMM TASK 49-91-41-200-002).
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201-207, Config-1 Aug 01/05 CES
(h) If there is oil leakage at the magnetic chip detector:
- replace the packing of the magnetic chip detector (Ref. AMM TASK 49-91-42-200-004).
(i) If there is oil leakage at the oil-sump drain-plug housing:
- replace the packing of the drain plug housing (Ref. AMM TASK 49-91-42-400-003).
(j) If there is oil leakage at the oil level switch/gearbox
interface:
- replace the packing of the oil level switch (Ref. AMM TASK 49-93-16-000-003) and (Ref. AMM TASK 49-93-16-400-003).
(k) If there is oil leakage at the de-oil solenoid/gearbox interface:
- replace the packing of the de-oil solenoid (Ref. AMM TASK 49-91-49-000-003) and (Ref. AMM TASK 49-91-49-400-003).
(l) If there is fuel leakage in the area of the fuel control unit:
- replace the seals and or the FUEL CONTROL UNIT P19 as necessary (Ref. AMM TASK 49-32-11-000-003) and (Ref. AMM TASK 49-32-11-400-003).
(m) If there is fuel leakage in the area of the inlet guide-vane actuator:
- replace the seals and/or the fuel lines to the actuator and/or the INLET GUIDE VANE-ACTUATOR P21 as necessary (Ref. AMM TASK 49-23-51-000-004) and (Ref. AMM TASK 49-23-51-400-004).
(2) If you find other unwanted material on the surfaces of the air intake system components:
- identify the material and its source, 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 2(123)
