Replacement of the Safety Valve Filter

TASK 21-31-52-610-001-A
Replacement of the Safety Valve Filter

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.

NOTE: The procedure is the same for the safety valves 6HL and 7HL.

FIN: 6HL
FIN: 7HL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03JEA1)	Silicone base Grease-Pressure System - -
(Material No.14QEB1)	Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -
No specific	glycerin

B. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
4	FILTER	AIPC 21-31-52-02-020
3	PACKING	AIPC 21-31-52-02-030

C. Referenced Information

REFERENCE	DESIGNATION
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)
Replacement of the Safety Valve Filter

3. Job Set-up
Subtask 21-31-52-861-050-A

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

Subtask 21-31-52-010-052-A

B. Get Access
(1) Remove the food trolleys from the Aft galley.
(2) Remove the access panel (1).

4. Procedure
Subtask 21-31-52-020-054-A

A. Removal of the Safety Valve Filter
(1) Remove the safety valve filter (with cover)
(a) Push the filter cover (5) and turn counter clockwise until the pins (2) disengage.
(b) Remove the filter cover (5).
(c) Remove and discard the safety valve filter (4) and the O-ring (3).
(2) Remove the safety valve filter (without cover)
(a) Remove and discard the lockwire.
(b) Remove and discard the safety valve filter (4) and the O-ring (3).

Subtask 21-31-52-420-051-A

B. Installation of the Safety Valve Filter
(1) Install the safety valve filter (with cover)
(a) Clean the component interfaces and the adjacent area.
(b) Do an inspection of the component interfaces and the adjacent area.
(c) Make sure that the parts retained from the removed component are clean and in the correct condition.
(d) Apply a small quantity of Silicone base Grease-Pressure System - - (Material No.03JEA1) or glycerin to the new AIPC 21-31-52-02-030 PACKING (3).
(e) Put the packing (3) in position on the new AIPC 21-31-52-02-020 FILTER (4).
(f) Install the filter (4).
(g) Install the filter cover (5).
(h) Push the filter cover (5) and turn clockwise until the pins (2) engage.
(2) Install the safety valve filter (without cover)
(a) Clean the component interfaces and the adjacent area.
(b) Do an inspection of the component interfaces and the adjacent area.
(c) Apply a small quantity of glycerin to the new AIPC 21-31-52-02-030 PACKING (3).
(d) Put the packing (3) in position on the new AIPC 21-31-52-02-020 FILTER (4).
(e) Install the filter (4).
(f) Safety the filter (4) with 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -.

5. Close-up
Subtask 21-31-52-410-052-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel (1).
(3) Replace the food trolleys in the Aft galley.

Subtask 21-31-52-862-050-A

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

[Rev.10 from 2021] 2026.04.02 06:11:16 UTC