Removal of the Outflow Valve (From Inside)

TASK 21-31-51-000-001-A
Removal of the Outflow Valve (From Inside)

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.

FIN: 10HL

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	1	ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE
No specific	AR	BOOMSET 600 OHMS
No specific	AR	CAP - BLANKING
No specific	AR	HEADSET 600 OHMS
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
162CW, 312AR, 826

C. Referenced Information

REFERENCE	DESIGNATION
TASK 23-44-00-700-001-A	Operational Test of the Service Interphone
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 25-55-12-000-003-A	Removal of the Sidewall Panels in the Aft Cargo Compartment - FR59/FR65
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
Outflow Valve 10HL ** ON A/C NOT FOR ALL
Outflow Valve 10HL ** ON A/C NOT FOR ALL
Outflow Valve 10HL ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 21-31-51-861-051-A

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

Subtask 21-31-51-865-072-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

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 21-31-51-865-115-A

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
122VU	RPCU	4HL	X23

Subtask 21-31-51-010-050-A

D. Get Access

WARNING: DO NOT OPEN OR GO NEAR PRESSURE-SEALED DOORS WHEN THE AIRCRAFT IS PRESSURIZED. A PRESSURE-SEALED DOOR THAT OPENS WHEN THE AIRCRAFT IS PRESSURIZED:

WILL CAUSE EXPLOSIVE DECOMPRESSION.
CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAUSE DAMAGE TO THE AIRCRAFT OR EQUIPMENT.

WARNING: OPEN THE ACCESS DOOR AND MAKE SURE IT STAYS OPEN. ATTACH A WARNING NOTICE TO THE ACCESS DOOR TO TELL PERSONS NOT TO CLOSE IT. THIS IS TO PREVENT ACCIDENTAL PRESSURIZATION OF THE AIRCRAFT BY THE AIR CONDITIONING SYSTEM IF ALL THE OTHER CABIN OPENINGS ARE CLOSED. PRESSURIZATION OF THE AIRCRAFT CAN BE DANGEROUS. IT CAN CAUSE A DOOR TO OPEN WITH EXPLOSIVE FORCE WHICH CAN CAUSE INJURY AND/OR DAMAGE.

(1) Put the ACCESS PLATFORM 2M (6 FT) in position below the outflow valve 10HL in the zone 172.
(2) Put the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE in position at the access panel 312AR.
(3) Remove the access panel 312AR.
(4) Open the AFT cargo-compartment door 826 (Ref. AMM TASK 52-30-00-860-001).
(5) Put the ACCESS PLATFORM 2M (6 FT) in position at the AFT cargo-compartment door 826.
(6) Remove the access panel 162CW (Ref. AMM TASK 25-55-12-000-003).

Outflow Valve 10HL ** ON A/C NOT FOR ALL

Subtask 21-31-51-869-052-A

E. Energize the service interphone system (Ref. AMM TASK 23-44-00-700-001).

Subtask 21-31-51-860-052-A

F. Aircraft Maintenance Configuration

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE OUTFLOW VALVES ARE CLEAR. MOVEMENT OF THE OUTFLOW VALVES CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Close the outflow valve from the cockpit:

NOTE: For this procedure we recommend that a minimum of two persons are in constant contact with each other through the service interphone system. One person must operate the outflow valve from the cockpit, the other must be at the outflow valve.

(a) In the zone 312, connect the BOOMSET 600 OHMS to the service interphone jack 13RJ.
(b) On the CAPT jack panel, connect the HEADSET 600 OHMS to the related connector.
(c) On the overhead panel 50VU, make sure that the ON legend on the SVCE INT OVRD pushbutton switch is off.
(d) On the CABIN PRESS panel 25VU, make sure that the MODE SEL pushbutton switch is in the MAN position.
(e) On the CABIN PRESS panel 25VU, set the MAN V/S CTL toggle switch to the DN position to close the outflow valve.

Subtask 21-31-51-865-099-A

G. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR COND/CAB/PRESS/CTL1	1HL	D09
** ON A/C NOT FOR ALL
122VU	AIR COND/AFT CARGO VENT/FAN	30HN	S22
** ON A/C ALL
122VU	AIR COND/LAV/GALLEY VENT CTL/EXTRACT FAN/SPLY	6HU	U19
122VU	AIR COND/CAB PRESS/CTL/MAN	3HL	Y23
122VU	AIR COND/CAB PRESS/CTL/2	2HL	Y22

4. Procedure
Subtask 21-31-51-020-068-A ** ON A/C NOT FOR ALL

A. Removal of the Outflow Valve
(1) Bonding strap removal:
(a) Remove the nut (29), the bolt (27), the washers (28) and disconnect the bonding strap (4).

NOTE: This step is only applicable for outflow valve P/N 9023-15703-81 and previous.

(b) Remove the bolt (27), the washer (28) and disconnect the bonding strap (4).

NOTE: This step is only applicable for outflow valve P/N 20790-01AA and subsequent.

(2) Disconnect the electrical connectors (1) 10HL-B, (2) 10HL-C, (3) 10HL-A, (23) 10HL-E and (26) 10HL-D.
(3) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(4) Remove the bolts (22), the washers (21) and (where fitted) the washers (24).
(5) From outside the aircraft remove the screws (7).
(a) Identify the screws for the installation procedure.
(6) Outflow valve removal:

WARNING: SUPPORT THE UNIT/ASSEMBLY. THE UNIT/ASSEMBLY IS HEAVY. IF YOU DO NOT SUPPORT IT, IT WILL FALL. THIS CAN CAUSE INJURY TO PERSONS, AND/OR DAMAGE TO EQUIPMENT.

(a) Lift and carefully remove the outflow valve (5).

NOTE: The outflow valve weighs approx. 12.5 kg (27.5578 lb).

1 Prevent damage to the gasket (6) and keep the location pins (8) with the outflow valve.

Subtask 21-31-51-020-068-B ** ON A/C NOT FOR ALL

A. Removal of the Outflow Valve
(1) Remove the bolt (30), the washer (31) and disconnect the bonding straps (4) and (11).
(2) Release the quick-release fasteners (12) and remove the grill (9) from the retaining clips (10).
(3) Put the bonding strap (4) in position and temporarily install the washer (31) and the bolt (30).
(4) Bonding strap removal:
(a) Remove the nut (29), the bolt (27), the washers (28) and disconnect the bonding strap (4).

NOTE: This step is only applicable for outflow valve P/N 9023-15703-81 and previous.

(b) Remove the bolt (27), the washer (28) and disconnect the bonding strap (4).

NOTE: This step is only applicable for outflow valve P/N 20790-01AA and subsequent.

(5) Disconnect the electrical connectors (1) 10HL-B, (2) 10HL-C, (3) 10HL-A, (23) 10HL-E and (26) 10HL-D.
(6) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(7) Remove the bolts (22), the washers (21) and (where fitted) the washers (24).
(8) From outside the aircraft remove the screws (7).
(a) Identify the screws for the installation procedure.
(9) Outflow valve removal:

WARNING: SUPPORT THE UNIT/ASSEMBLY. THE UNIT/ASSEMBLY IS HEAVY. IF YOU DO NOT SUPPORT IT, IT WILL FALL. THIS CAN CAUSE INJURY TO PERSONS, AND/OR DAMAGE TO EQUIPMENT.

(a) Lift and carefully remove the outflow valve (5).

NOTE: The outflow valve weighs approx. 12.5 kg (27.5578 lb).

1 Prevent damage to the gasket (6) and keep the location pins (8) with the outflow valve.

Subtask 21-31-51-410-068-A

B. Close access
(1) In the zone 312, disconnect and remove the 600 ohm boomset from the service interphone jack 13RJ.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Install the access panel 312AR.
(4) Remove the access platform from the zone 312.
(5) In the cockpit on the CAPT jack panel, disconnect and remove the 600 ohm headset.

[Rev.10 from 2021] 2026.04.02 06:48:13 UTC