Cleaning of the Moveable Seals of the Outflow-Valve

TASK 21-31-00-100-001-A
Cleaning of the Moveable Seals of the Outflow-Valve

WARNING: MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE. HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.

WARNING: MAKE SURE THAT THE FWD AVIONICS ACCESS DOOR 811 IS OPEN WITH A WARNING PLACARD ATTACHED TO IT. THE WARNING NOTICE MUST TELL PERSONS NOT TO CLOSE THE DOOR. THIS PREVENTS ACCIDENTAL PRESSURIZATION OF THE AIRCRAFT.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT)
No specific	AR	AIR SOURCE 0 TO 1 BAR (0 TO 15 PSI)
No specific	AR	BRUSH - BRISTLED, SOFT

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BBE1)	Non Aqueous Cleaner-- Methyl Alcohol -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Referenced Information

REFERENCE	DESIGNATION
TASK 21-31-51-000-001-A	Removal of the Outflow Valve (From Inside)
TASK 21-31-51-000-006-A	Removal of the Outflow Valve (From Outside)
TASK 21-31-51-400-001-A	Installation of the Outflow Valve (From Inside)
TASK 21-31-51-400-006-A	Installation of the Outflow Valve (From Outside)
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
Outflow-Valve Moveable Seals - Component Location
Outflow-Valve Springs - Component Location

3. Job Set-up
Subtask 21-31-00-861-065-A

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 21-31-00-865-068-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR COND/CAB/PRESS/CTL1	1HL	D09
122VU	AIR COND/CAB PRESS/CTL/MAN	3HL	Y23
122VU	AIR COND/CAB PRESS/CTL/2	2HL	Y22

Subtask 21-31-00-941-054-A

C. Put the ACCESS PLATFORM 2M (6 FT) in position below the outflow valve in zone 172.

Subtask 21-31-00-860-069-A

D. Make sure that the outflow valve is in the open position.

4. Procedure
Subtask 21-31-00-110-050-A ** ON A/C NOT FOR ALL

A. Cleaning of the Outflow-Valve Moveable Seals

Outflow-Valve Moveable Seals - Component Location ** ON A/C NOT FOR ALL

Outflow-Valve Springs - Component Location ** ON A/C NOT FOR ALL

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(1) Clean the moveable seals (1) with a BRUSH - BRISTLED, SOFT, Textile-Lint free Cotton - (Material No.14SBA1) and Non Aqueous Cleaner-- Methyl Alcohol - (Material No.08BBE1) .
(2) Blow any dust or loose deposits from the moveable seals with a AIR SOURCE 0 TO 1 BAR (0 TO 15 PSI).
(3) If necessary repeat the cleaning procedure until the seals move freely with a light finger pressure.
(4) If the seals are clean:
(a) Press them into their slots with two fingers.
If the seals do not come out easily and smoothly:
(b) Remove the related outflow valve (Ref. AMM TASK 21-31-51-000-001) or (Ref. AMM TASK 21-31-51-000-006)
(c) Replace the springs (2) as follows:

Remove the screws (4)
Lift the seals (3), (5), (6), (7), (8) and (9) and remove the springs (2)
Install new springs (2)
Put the seals (3), (5), (6), (7), (8) and (9) in position
Install the screws (4).

NOTE: Seals must slide freely after installation of screw.

(d) Install the related outflow valve (Ref. AMM TASK 21-31-51-400-001) or (Ref. AMM TASK 21-31-51-400-006)

Subtask 21-31-00-110-050-B ** ON A/C NOT FOR ALL

A. Cleaning of the Outflow-Valve Moveable Seals

Outflow-Valve Moveable Seals - Component Location ** ON A/C NOT FOR ALL

Outflow-Valve Springs - Component Location ** ON A/C NOT FOR ALL

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

Remove the screws (4)
Lift the seals (3), (5), (6), (7), (8) and (9) and remove the springs (2)
Install new springs (2)
Put the seals (3), (5), (6), (7), (8) and (9) in position
Install the screws (4).

NOTE: Seals must slide freely after installation of screw.

(d) Install the related outflow valve (Ref. AMM TASK 21-31-51-400-001)

5. Close-up
Subtask 21-31-00-860-070-A

A. Aircraft Maintenance Configuration
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).

Subtask 21-31-00-865-069-A

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR COND/CAB/PRESS/CTL1	1HL	D09
122VU	AIR COND/CAB PRESS/CTL/MAN	3HL	Y23
122VU	AIR COND/CAB PRESS/CTL/2	2HL	Y22

Subtask 21-31-00-862-062-A

C. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:04:38 UTC