Installation of the Filter Assembly

TASK 21-26-43-400-006-A
Installation of the Filter Assembly

WARNING: PUT ON GLOVES, A COVERALL WITH A HOOD, GOGGLES AND A PARTICULATE RESPIRATOR BEFORE YOU TOUCH THE FILTER. THE FILTER REMOVES SMALL PARTICLES (SMOKE, DUST, LINT, FIBERS, POLLEN) AND INFECTIOUS MATERIALS (BACTERIA, VIRUSES, MOLD SPORES, FUNGI) FROM THE AIR. THESE MATERIALS CAN CAUSE ILLNESS.

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

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
824

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
7	O-RING	AIPC 21-26-01-03-050
7	O-RING	AIPC 21-26-01-27-050
7	O-RING	AIPC 21-26-81-03-050

D. Referenced Information

REFERENCE	DESIGNATION
TASK 21-26-43-600-016-A	Discard Demister Filter Element and Filter Cartridge (LE BOZEC)
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)
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
Filter Assembly

3. Job Set-up
Subtask 21-26-43-860-059-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are de-energized (Ref. AMM TASK 24-41-00-862-002).
(2) Make sure that the ground service network is energized (Ref. AMM TASK 24-42-00-861-001).

Subtask 21-26-43-865-122-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR COND/AVNCS VENT/CTL	6HQ	D06
49VU	AIR COND/AVNCS VENT/CTL	5HQ	D05
122VU	AIR COND/AVNCS/VENT/MONG	3HQ	Y17
123VU	AVNCS VENT/EXTC/FAN	2HQ	AC04
123VU	AVNCS VENT/BLOWER/FAN	1HQ	AD10

Subtask 21-26-43-010-096-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position below the avionics-compartment aft door 824.
(2) Make sure that the access door is open 824.

Subtask 21-26-43-160-074-A ** ON A/C NOT FOR ALL

D. Clean the component interfaces and the adjacent area.

Subtask 21-26-43-210-082-A ** ON A/C NOT FOR ALL

E. Do an inspection of the component interfaces and the adjacent area.

4. Procedure
Subtask 21-26-43-420-083-A ** ON A/C NOT FOR ALL

A. Installation of the Filter Assembly
(1) Remove the blanking plugs from the disconnected line ends.
(2) Put the filter housing (4) in position.
(3) Install the screws (2) and the nuts (5) and tighten.
(4) Install a new AIPC 21-26-01-03-050 O-RING (7) or AIPC 21-26-81-03-050 O-RING (7) or AIPC 21-26-01-27-050 O-RING (7) or AIPC 21-26-81-03-050 O-RING (7).
(5) Install and tighten the clamp (6).
(6) Install the drain hose (9).
(7) Install and tighten the clamp (8).
(8) Install the flexible sleeves (1) and (10) on the ducts (11) and (14).
(9) Install and tighten the clamps (12) and (13).
(10) Make sure that the attachments (3) are correctly tightened.
(11) Turn the seven door fasteners of the filter housing (4) to open the door.
(12) Install the demister filter and the filter cartridge (Ref. AMM TASK 21-26-43-600-016).

5. Close-up
Subtask 21-26-43-410-090-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 824 (Ref. AMM TASK 52-41-00-410-002).
(3) Remove the access platform(s).

Subtask 21-26-43-865-123-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR COND/AVNCS VENT/CTL	6HQ	D06
49VU	AIR COND/AVNCS VENT/CTL	5HQ	D05
122VU	AIR COND/AVNCS/VENT/MONG	3HQ	Y17
123VU	AVNCS VENT/EXTC/FAN	2HQ	AC04
123VU	AVNCS VENT/BLOWER/FAN	1HQ	AD10

Subtask 21-26-43-861-119-A ** ON A/C NOT FOR ALL

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

Subtask 21-26-43-862-114-A ** ON A/C NOT FOR ALL

D. De-energize the ground service network (Ref. AMM TASK 24-42-00-862-001).

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