Removal of the Ozone Filter

TASK 21-51-41-000-001-A
Removal of the Ozone 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 ozone filters 100HM and 101HM.

FIN: 100HM
FIN: 101HM

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	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [100HM] (P1 OZONE FILTER)
191BB, 191KB
FOR [101HM] (P2 OZONE FILTER)
192FB, 192KB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 21-51-41-200-001-A	Attachment Components (In-Service Wear Limits) - Ozone Filter
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 53-35-13-000-002-A	Removal of the Quick-Release Access Panels from the Belly Fairing Structure
Ozone Filter ** ON A/C NOT FOR ALL
Ozone Filter ** ON A/C NOT FOR ALL
Ozone Filter ** ON A/C NOT FOR ALL
Ozone Filter ** ON A/C NOT FOR ALL
Insulation Cover ** ON A/C NOT FOR ALL
Attachment Components - Ozone Filter

3. Job Set-up
Subtask 21-51-41-861-051-A

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

Subtask 21-51-41-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 100HM (P1 OZONE FILTER)
49VU	AIR COND/FLOW/CTL &/IND1	1HB	D07
** ON A/C NOT FOR ALL
49VU	AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC	52HH	D08
** ON A/C NOT FOR ALL
122VU	AIR COND/PACK TEMP/CTL SYS1/1/115VAC	1HH	X22
122VU	AIR COND/PACK TEMP/CTL SYS1/1/28VDC	3HH	X21
122VU	AIR COND/PACK TEMP CTL SYS2/1/28VDC	4HH	Y19
122VU	AIR COND/PACK TEMP CTL SYS2/1/115VAC	2HH	Y18
** ON A/C NOT FOR ALL
122VU	AIR COND/TEMP CTL SYS 1/CHAN A/115VAC	49HH	X22
122VU	AIR COND/TEMP CTL SYS 1/CHAN A/28VDC	51HH	X21
122VU	AIR COND/TEMP CTL SYS 1/CHAN B/115VAC	50HH	Y18
** ON A/C NOT FOR ALL
FOR FIN: 101HM (P2 OZONE FILTER)
122VU	AIR COND/FLOW/CTL AND IND/2	2HB	V21
122VU	AIR COND/PACK TEMP/CTL SYS1/2/115VAC	21HH	W22
122VU	AIR COND/PACK TEMP/CTL SYS1/2/28VDC	23HH	W21
122VU	AIR COND/PACK TEMP CTL SYS2/2/28VDC	24HH	Y21
122VU	AIR COND/PACK TEMP CTL SYS2/2/115VAC	22HH	Y20
** ON A/C NOT FOR ALL
122VU	AIR COND/TEMP CTL SYS 2/CHAN A/115VAC	53HH	W22
122VU	AIR COND/TEMP CTL SYS 2/CHAN A/28VDC	55HH	W21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/28VDC	56HH	Y21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/115VAC	54HH	Y20

Subtask 21-51-41-941-050-A

C. Safety Precautions
(1) On the panel 30VU:
(a) Make sure that:

the APU BLEED pushbutton switch is in the off position (the ON legend is off) and,
the ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in the off position (the OFF legends are on).

(b) Put a warning notice in position to tell persons not to operate these pushbutton switches.
(2) On the HP ground connector put a warning notice in position to tell persons not to supply the ground air.

Subtask 21-51-41-010-050-A

D. Get Access
(1) Remove the access panels (Ref. AMM TASK 53-35-13-000-002):
(a) FOR [100HM] (P1 OZONE FILTER)
191KB and 191BB.
(b) FOR [101HM] (P2 OZONE FILTER)
192KB and 192FB.

4. Procedure
Subtask 21-51-41-020-050-C ** ON A/C NOT FOR ALL

A. Removal of the Ozone Filter

Ozone Filter ** ON A/C NOT FOR ALL

(1) Disconnect the sense line (7).
(2) Put the PLUG-BLANKING in each disconnected line end.
(3) Remove the nut (21), the washer (20), the bolt (18) and disconnect the bonding strap (19).
(4) Remove the clamps (22) and (31).
(5) Move the flange (23) and the sleeve (11) as far away from the ozone filter (30) as they will go.

NOTE: Turn the sleeve (11) when you move it.
This will help to prevent damage to the seals in the sleeve (11).

(6) Hold the ozone filter (30) and:
(a) Remove the nut (13), the washer (14) the bolt (15) and disconnect the support rod (1).
(b) Remove the nuts (26), the washers (25) and the bolts (24).

NOTE: The ozone filter weighs aprx. 14 kg (30.8647 lb).

(7) Carefully remove the ozone filter (30) from the aircraft.
(8) Put protective covers on the open ends of the flange (23), the pack flow-control valve (29) and the ozone filter (30).

Subtask 21-51-41-020-050-D ** ON A/C NOT FOR ALL

A. Removal of the Ozone Filter

Ozone Filter ** ON A/C NOT FOR ALL

(1) Remove the nut (21), the washer (20), the bolt (18) and disconnect the bonding strap (19).
(2) Remove the clamps (22) and (31).
(3) Move the flange (23) and the sleeve (11) as far away from the ozone filter (30) as they will go.

NOTE: Turn the sleeve (11) when you move it.
This will help to prevent damage to the seals in the sleeve (11).

(4) Hold the ozone filter (30) and:
(a) Remove the nut (13), the washer (14) the bolt (15) and disconnect the support rod (1).
(b) Remove the nuts (26), the washers (25) and the bolts (24).

NOTE: The ozone filter weighs aprx. 14 kg (30.8647 lb).

(5) Carefully remove the ozone filter (30) from the aircraft.
(6) Put protective covers on the open ends of the flange (23), the pack flow-control valve (29) and the ozone filter (30).

Subtask 21-51-41-020-050-G ** ON A/C NOT FOR ALL

A. Removal of the Ozone Filter

Ozone Filter ** ON A/C NOT FOR ALL

Insulation Cover ** ON A/C NOT FOR ALL

NOTE: Turn the sleeve (11) when you move it.
This will help to prevent damage to the seals in the sleeve (11).

(4) Hold the ozone filter (30) and:
(a) Remove the nut (13), the washer (14) the bolt (15) and disconnect the support rod (1).
(b) Remove the nuts (26), the washers (25) and the bolts (24).

NOTE: The ozone filter weighs aprx. 14 kg (30.8647 lb).

(5) Carefully remove the ozone filter (30) from the aircraft.
(6) If installed, remove the insulation cover (40):

Remove and discard the tie wraps (41)
Open the velcro tape (42) and remove the insulation cover (40).

(7) Put protective covers on the open ends of the flange (23), the pack flow-control valve (29) and the ozone filter (30).

Subtask 21-51-41-020-050-H ** ON A/C NOT FOR ALL

A. Removal of the Ozone Filter

Ozone Filter ** ON A/C NOT FOR ALL

Insulation Cover ** ON A/C NOT FOR ALL

NOTE: Turn the sleeve (11) when you move it.
This will help to prevent damage to the seals in the sleeve (11).

(4) Hold the ozone filter (30) and:
(a) Remove the nut (13), the washer (14) the bolt (15) and disconnect the support rod (1).
(b) Remove the nuts (26), the washers (25) and the bolts (24).

NOTE: The ozone filter weighs aprx. 14 kg (30.8647 lb).

(5) Carefully remove the ozone filter (30) from the aircraft.
(6) Remove the tie wraps (41), open the velcro tape (42) and remove the insulation cover (40) from the ozone filter (30).
(7) Put protective covers on the open ends of the flange (23), the pack flow-control valve (29) and the ozone filter (30).

Subtask 21-51-41-020-051-A

B. Removal of the Bracket Assembly and Support Rod

Attachment Components - Ozone Filter

(1) Remove the nuts (4), the washers (5), the bolts (6), the bushings (7) and the bracket assembly (12).
(2) Remove the nut (4), the washer (5), the bolt (6), the bushing (7) and the support-rod (1).
(3) Do the inspection of the components for in-service wear (Ref. AMM TASK 21-51-41-200-001).

[Rev.10 from 2021] 2026.04.01 04:53:20 UTC