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 : 001-049, 101-105, 107-107, 151-199, ∞∞49-00-81∞∞∞∞∞∞∞∞∞∞Page B234
 201-210, Config-1 Aug 01/05 CES

 - 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).
 「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 : 001-049, 101-105, 107-107, 151-154, ∞∞49-00-81∞∞∞∞∞∞∞∞∞∞Page B235
 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,
　
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