Smoke and/or Oil Smell in the Cabin

TASK 71-00-00-810-802-A
Smoke and/or Oil Smell in the Cabin

1. Possible Causes

stationary air oil seals in the forward sump
static seals in the forward sump

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 21-00-00-615-003	Decontamination of the Environmental Control System (ECS) when the Temperature is below 24 deg.C (Engine/s)
AMM 21-00-00-615-004	Decontamination of the Environmental Control System (ECS) when the Temperature is above 24 deg.C (Engine/s)
AMM 71-00-00-710-006	Minimum Idle Check
AMM 71-00-00-790-002	Fuel or Hydraulic or Oil Leakage Limits
AMM 72-31-00-290-001	Inspection of the High Pressure Compressor Rotor Assembly
AMM 72-31-00-290-002	Inspection of the High Pressure Compressor Rotor Assembly
AMM 75-31-60-000-001	Removal of the Bleed Valve and Ballscrew Actuator Assembly
AMM 75-31-60-000-002	Removal of the Bleed Valve and Ballscrew Actuator Assembly
AMM 75-31-60-400-001	Installation of the Bleed Valve and Ballscrew Actuator Assembly
AMM 75-31-60-400-002	Installation of the Bleed Valve and Ballscrew Actuator Assembly

3. Fault Confirmation
Subtask 71-00-00-710-051-A ** ON A/C NOT FOR ALL

A. Not applicable, the fault is evident.

4. Fault Isolation
Subtask 71-00-00-810-051-A ** ON A/C NOT FOR ALL

A. If the fault symptom is identified by the crew observation smoke and/or smell in the cabin from the engine:

NOTE: The fault can be due to deffective stationary air oil seals in the forward sump or static seals in the forward sump .

do a minimum idle check AMM 71-00-00-710-006 for 15 minutes at minimum idle.
check for oil drops or smoke coming out of the forward sump drain, during the engine operation AMM 71-00-00-790-002.

(1) Do a borescope inspection of the HP compressor stage No.1 and No.2 blades through the S1 and S2 inspection ports AMM 72-31-00-290-001. Check for oil wetting.
(2) Check for presence of oil wetting at the 6 O'clock position of the booster inlet (IGV).
(3) Check for presence of oil wetting inside the two lower forward sump pressurizing tubes.
(a) remove one of the bleed valve and ballscrew actuator assembly at the 4 or 8 O'clock position AMM 75-31-60-000-001.
(b) get your hand through the VBV door opening to access to the inlet of the forward sump pressurization tube.
(c) check with the finger tip for presence of oil wetting.

NOTE: If the access is too difficult, use a flexible borescope.

(d) install the bleed valve and ballscrew actuator assembly AMM 75-31-60-400-001.
(4) If excessive oil leakage/smoke from the forward sump drain, oil wetting on the HPC stage 1 and 2 blades, oil wetting on the booster inlet and the forward sump pressurizing tubes was identified, remove the engine.
(5) If no oil leakage/smoke from the forward sump drain, oil wetting on the HPC stage 1 and 2 blades, oil wetting on the booster inlet and the forward sump pressurizing tubes was identified:
(a) clean and do the decontamination of the Environmental Control System (ECS) AMM 21-00-00-615-003 or AMM 21-00-00-615-004.

Subtask 71-00-00-810-051-B ** ON A/C NOT FOR ALL

A. If the fault symptom is identified by the crew observation smoke and/or smell in the cabin from the engine:

NOTE: The fault can be due to deffective stationary air oil seals in the forward sump or static seals in the forward sump .

do a minimum idle check AMM 71-00-00-710-006 for 15 minutes at minimum idle.
check for oil drops or smoke coming out of the forward sump drain, during the engine operation AMM 71-00-00-790-002.

(1) Do a borescope inspection of the HP compressor stage No.1 and No.2 blades through the S1 and S2 inspection ports AMM 72-31-00-290-002. Check for oil wetting.
(2) Check for presence of oil wetting at the 6 O'clock position of the booster inlet (IGV).
(3) Check for presence of oil wetting inside the two lower forward sump pressurizing tubes.
(a) remove one of the bleed valve and ballscrew actuator assembly at the 4 or 8 O'clock position AMM 75-31-60-000-002.
(b) get your hand through the VBV door opening to access to the inlet of the forward sump pressurization tube.
(c) check with the finger tip for presence of oil wetting.

NOTE: If the access is too difficult, use a flexible borescope.

(d) install the bleed valve and ballscrew actuator assembly AMM 75-31-60-400-002.
(4) If excessive oil leakage/smoke from the forward sump drain, oil wetting on the HPC stage 1 and 2 blades, oil wetting on the booster inlet and the forward sump pressurizing tubes was identified, remove the engine.
(5) If no oil leakage/smoke from the forward sump drain, oil wetting on the HPC stage 1 and 2 blades, oil wetting on the booster inlet and the forward sump pressurizing tubes was identified:
(a) clean and do the decontamination of the Environmental Control System (ECS) AMM 21-00-00-615-003 or AMM 21-00-00-615-004.

[Rev.8 from Aug 2018] 2026.04.04 04:34:56 UTC