Odours and mist in the cabin and not fire

TASK 26-15-00-810-804-A
Odours and mist in the cabin and not fire

1. Possible Causes

line between the APU and the APU BLEED VALVE
[8MD]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 38-41-00-810-803-A	Potable Water System - Relief Pressure Failure
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))
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 31-50-00-710-001	Ground Scanning of the Central Warning System
AMM 38-42-51-000-001	Removal of the Compressor
AMM 38-42-51-400-001	Installation of the Compressor

3. Fault Confirmation
Subtask 26-15-00-710-055-A

A. Not applicable, you cannot confirm this fault on the ground.

4. Fault Isolation
Subtask 26-15-00-810-053-B ** ON A/C NOT FOR ALL

A. If there are odours and mist:
(1) carefully examine the APU externally and make sure that you do not find leaks on the oil system components or oil lines.
(a) If you do not find external oil leaks:

remove the line between the APU and the APU BLEED VALVE .
check the contamination (Ref. TSM TASK 49-00-00-810-921).

(b) If the fault continues:

decontaminate the lines AMM 21-00-00-615-001 or AMM 21-00-00-615-002.

(2) If the fault continues and if the compressor (8MD) is installed:
(a) Do a check of the [8MD] and replace it, if necessary AMM 38-42-51-000-001 and AMM 38-42-51-400-001.
(b) Do a check for relief pressure failure (Ref. TSM TASK 38-41-00-810-803).

Subtask 26-15-00-810-053-C ** ON A/C NOT FOR ALL

remove the line between the APU and the APU BLEED VALVE .
check the contamination (Ref. TSM TASK 49-00-81-810-874).

(b) If the fault continues:

decontaminate the lines AMM 21-00-00-615-001 or AMM 21-00-00-615-002.

(2) If the fault continues and if the compressor (8MD) is installed:
(a) Do a check of the COMPRESSOR [8MD] and replace it, if necessary AMM 38-42-51-000-001 and AMM 38-42-51-400-001.
(b) Do a check for relief pressure failure (Ref. TSM TASK 38-41-00-810-803).

Subtask 26-15-00-865-051-A

B. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	FWS/FWC1/SPLY	3WW	F01
121VU	EIS/FWC2/SPLY	2WW	Q07

Subtask 26-15-00-710-056-A

C. Test
(1) Reset of the FWC1 and FWC2

NOTE: Open the circuit breakers for some seconds before you close them.

(a) Open this(these) circuit breaker(s):
1 2WW
2 3WW
(b) Close this(these) circuit breaker(s):
1 2WW
2 3WW
(2) Do the ground scanning of the central warning system AMM 31-50-00-710-001.

[Rev.8 from Aug 2018] 2026.04.04 04:39:01 UTC