Oil in the Air Conditioning System

TASK 21-00-00-810-801-A
Oil in the Air Conditioning System

1. Possible Causes

external oil leakage
engine(s)

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	LIGHT SOURCE - ULTRA-VIOLET, PORTABLE

B. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 49-00-00-810-921-A	Fumes in the Cabin/Oil Smoke at the APU Exhaust (APS 3200)
TSM TASK 49-00-81-810-874-A	Fumes in the Cabin/Oil Smoke at the APU Exhaust (131-9(A))
TSM TASK 71-00-00-810-802-A	Smoke and/or Oil Smell in the Cabin
AMM 21-00-00-615-001	Decontamination of the Environmental Control System (ECS) when the Temperature is below 24 deg.C (APU)
AMM 21-00-00-615-002	Decontamination of the Environmental Control System (ECS) when the Temperature is above 24 deg.C (APU)
AMM 49-11-11-000-001	Removal of the Auxiliary Power Unit (APU) (GTCP 36-300)
AMM 49-11-11-000-003	Removal of the Power Plant (APU) (APS 3200)
AMM 49-11-11-000-004	Removal of the Power Plant (APU) (131-9(A))
AMM 49-11-11-400-001	Installation of the Auxiliary Power Unit (APU) (GTCP 36-300)
AMM 49-11-11-400-003	Installation of the Power Plant (APU) (APS 3200)
AMM 49-11-11-400-004	Installation of the Power Plant (APU) (131-9(A))

3. Fault Confirmation
Subtask 21-00-00-710-052-A

A. If there was (is) a smell of oil in the cabin

do a visual inspection for leaks on the APU with a LIGHT SOURCE - ULTRA-VIOLET, PORTABLE:

(1) Remove the APU bleed-air duct-elbow forward of the bleed control valve,

for GTCP 36-300 AMM 49-11-11-000-001
for APS 3200 APU AMM 49-11-11-000-003
for 131-9(A) AMM 49-11-11-000-004.

(2) Do a general visual inspection of the

Air Plenum Duct,
Inlet Guide Vanes,
Compressor Bellmouth,
Turbine Blades and
Turbine Bellmouth.

NOTE: It is not necessary to remove the air inlet if you do the general visual inspection with a LIGHT SOURCE - ULTRA-VIOLET, PORTABLE.

4. Fault Isolation
Subtask 21-00-00-810-053-A

A. If there is oil in the APU bleed-air duct-elbow, on the air plenum duct, compressor or turbine area around the air inlet:

do a check for external oil leaks of the APU.

NOTE: A damaged turbine or compressor carbon seal can cause oil contamination on the compressor or turbine bellmouths, at the 6 o' clock position. If this fault occurs, refer to step (3).

(1) If there is an external oil leakage :
(a) do the necessary steps to stop the external oil leakage and clean and install the APU bleed-air duct-elbow:

for GTCP 36-300 AMM 49-11-11-400-001
for APS 3200 APU AMM 49-11-11-400-003
for 131-9(A) AMM 49-11-11-400-004

(b) do the trouble shooting of the APU:

for GTCP 36-300 (Ref. TSM TASK 49-00-00-810-846)
for APS 3200 APU (Ref. TSM TASK 49-00-00-810-921)
for 131-9(A) (Ref. TSM TASK 49-00-81-810-874)

(c) do the decontamination of the ECS AMM 21-00-00-615-001 or AMM 21-00-00-615-002.
(2) If there is no external oil leakage:
(a) clean and install the APU bleed-air duct elbow:

for GTCP 36-300 AMM 49-11-11-400-001
for APS 3200 APU AMM 49-11-11-400-003
for 131-9(A) AMM 49-11-11-400-004

(b) do the trouble shooting of the APU:

for GTCP 36-300 (Ref. TSM TASK 49-00-00-810-846)
for APS 3200 APU (Ref. TSM TASK 49-00-00-810-921)
for 131-9(A) (Ref. TSM TASK 49-00-81-810-874)

(c) do the decontamination of the ECS AMM 21-00-00-615-001 or AMM 21-00-00-615-002.
(d) do the trouble shooting of the engine(s) (Ref. TSM TASK 71-00-00-810-802).
(3) If there is no external oil leakage and oil is found on the turbine bellmouth at the 6 o' clock position:
(a) replace the APU:

for APS 3200 AMM 49-11-11-000-001 and AMM 49-11-11-400-001.
for GTCP 36-300 APU AMM 49-11-11-000-003 and AMM 49-11-11-400-003.
for 131-9(A) AMM 49-11-11-000-004 and AMM 49-11-11-400-004.

Subtask 21-00-00-810-058-A

B. If there is no oil in the APU bleed-air duct-elbow or around the air inlet:

do the trouble shooting of the engine(s) (Ref. TSM TASK 71-00-00-810-802).

[Rev.8 from Aug 2018] 2026.04.04 04:38:48 UTC