____ which results in oil smell/fumes in the passenger compartment.
(2)
Do a check for oil at the load-compressor seal drain. If there is oil, an internal oil leakage must be suspected:
(a) Replace the APU (Ref. TASK 49-11-11-000-003) and (Ref. TASK 49-11-11-400-003)
(3)
Examine the load compressor to gearbox interface-area for oil leakage. If there is an oil leakage:
(a)
Clean and degrease the area.
(b)
Start and run the APU for at least 5 minutes (Ref. TASK 49-00-00-860-005).
(c)
Stop the APU (Ref. TASK 49-00-00-860-006).
(d)
Examine the area carefully again.
-use a bright light source or black light to make sure of the oil leakage. If there is an oil leakage replace the APU (Ref. TASK 49-11-11-000-003) and (Ref. TASK 49-11-11-400-003).
(4)
If an APU internal oil-leak or oil ingestion from an external oil-leak is identified:
-remove the APU bleed ducts and inspect internally for oil contamination, before the A/C is returned into service with a repaired or replaced APU.
(a)
If the ducts are contaminated, clean and degrease the ducts and the Load Control Valve.
(b)
Clean the ECS system (Ref. TASK 21-00-00-615-001) or (Ref. TASK 21-00-00-615-002).
Subtask 49-00-00-210-068
E. Fluid Migration in Intake Duct and APU Compartment
(1) Do the steps that follow to detect and/or prevent APU
internal/external fluid leakage:
NOTE : APU internal/external fluid leakage can cause an oil
____
smell/fumes in the cabin.
(a)
Examine the APU air intake and intake duct internally and externally for fluid (engine oil/hydraulic oil/fuel/de-icing fluid) contamination by migration. If contamination is found:
-
clean the air-intake duct and diffuser elbow (Ref. TASK 49-16-00-100-002).
-
clean the air-intake flap internally and externally.
-
clean the APU access doors internally and externally.
-
clean the APU compartment walls and fire bulkheads.
(b)
Examine the APU inlet plenum for oil/fluid contamination. If contamination is found:
-clean the APU inlet plenum with a degreaser and/or steam cleaner.
Subtask 49-00-00-210-069
F. Inspect the APU External Components/Interfaces for Oil Leakage
(1)
Examine the cooling-fan discharge-duct for oil contamination.
(a)
Remove the cooling-fan discharge-duct (Ref. TASK 49-52-53-000-001).
(b)
Examine the inside of the duct for oil contamination. If the duct is contaminated and the inside of the APU inlet plenum is clean, further inspection of the cooling fan is required.
-refer to AI-SIL 49-032 Para 4.2 (APIC APS3200 APU ENGINEERING FIXES).
(c)
Install the cooling-fan discharge-duct (Ref. TASK 49-52-53-400-001).
(2)
Examine the housing of the APU rear-housing for oil leakage.
(a)
Remove the APU exhaust muffler (Ref. TASK 49-81-41-000-002).
(b)
Examine the housing of the APU rear-housing for oil leakage. If an oil leakage is found:
-replace the APU (Ref. TASK 49-11-11-000-003) and (Ref. TASK 49-11-11-400-003).
(c)
Install the APU exhaust muffler (Ref. TASK 49-81-41-400-002). Subtask 49-00-00-210-071
G.
Inspection of the APU Compartment Fire, Duct and Drain Seals.
(1)
Examine the fire-wall seal at frame 80. If the seal is damaged or deformed, replace the seal (Ref. TASK 49-16-00-210-002).
(2)
Examine the APU inlet seal (diffuser to plenum interface). If the seal is damaged or deformed, replace the seal (Ref. TASK 49-16-45-000-002) and (Ref. TASK 49-16-45-400-002).
(3)
Make sure that the air-intake diffuser is correctly aligned. NOTE : If the diffuser is not correctly aligned, unwanted fluids can
____
be ingested.
-align the air-intake diffuser (Ref. TASK 49-16-45-400-002).
(4) Make sure that the APU drain tubes are correctly aligned with the bellows collector-assembly on the RH APU access door. If they are not correctly aligned:
-adjust the bellows assembly (Ref. TASK 49-17-41-400-002).
5. Close-up
________ Subtask 49-00-00-410-077
A. Close Access
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