Removal of the Air Conditioning Pack

TASK 21-52-41-000-001-A
Removal of the Air Conditioning Pack

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: DO NOT TOUCH THE COMPONENT UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS.

NOTE: The procedure is the same for the air conditioning pack 10HM (11HM)

FIN: 10HM
FIN: 11HM

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	CAP - BLANKING
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [10HM] (PACK 1-AIR CONDITIONING)
191BB, 191KB
FOR [11HM] (PACK 2-AIR CONDITIONING)
192FB, 192KB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 21-52-41-200-001-A	Attachment Components (In-Service Wear Limits) - Air Conditioning Pack
TASK 21-58-54-000-001-A	Removal of the Temperature Control Module
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
Access Panel Location
Air Duct Connections ** ON A/C NOT FOR ALL
Air Duct Connections ** ON A/C NOT FOR ALL
Air Duct Connections ** ON A/C NOT FOR ALL
Air Duct Connections ** ON A/C NOT FOR ALL
Electrical and Sense Line Connectors ** ON A/C NOT FOR ALL
Electrical and Sense Line Connectors ** ON A/C NOT FOR ALL
Electrical and Sense Line Connectors ** ON A/C NOT FOR ALL
Electrical and Sense Line Connectors ** ON A/C NOT FOR ALL
Tie Rod and Bonding Connections
Attached Components ** ON A/C NOT FOR ALL
Attached Components ** ON A/C NOT FOR ALL
Attached Components ** ON A/C NOT FOR ALL
Attachment Components

3. Job Set-up
Subtask 21-52-41-861-051-A

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

Subtask 21-52-41-941-050-A

B. Safety Precautions
(1) On the overhead panel, on the control 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(S) in position to tell persons not to operate these pushbutton switches.
(2) On the HP ground connector put a WARNING NOTICE(S) in position to tell persons not to supply the ground air.

Subtask 21-52-41-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 10HM (PACK 1AIR CONDITIONING)
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
121VU	IGGS/CTRL	7YA	N28
** ON A/C NOT FOR ALL
121VU	IGGS/CTRL	7YA	P28
** 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
122VU	CSAS / CTRL	1HW	U17
** ON A/C NOT FOR ALL
FOR FIN: 11HM (PACK 2AIR CONDITIONING)
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 21-52-41-010-050-A

D. Get Access

Access Panel Location

(1) Remove the access panel/s (Ref. AMM TASK 53-35-13-000-002).
(a) FOR [10HM] (PACK 1-AIR CONDITIONING)

191BB
191KB,

(b) FOR [11HM] (PACK 2-AIR CONDITIONING)

192FB
192KB.

4. Procedure
Subtask 21-52-41-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Cross Beam and the Duct Connectors

Air Duct Connections ** ON A/C NOT FOR ALL

(1) Remove the quick release pins (13) and (14) and the cross beam (11).
(2) Remove the clamp (9) and disconnect the sleeve (10).
(3) Remove the clamp (6) and disconnect the bellows (7).
(4) Remove the clamp (2) and disconnect the bellows (3).
(5) Remove the clamp (36).
(6) Remove the clamp (30) and move the sleeve (31) on the duct flange (43) (away from the air conditioning pack (4)).
(7) Remove the clamp (34) and move the duct (33) and the sleeve (32) to the air conditioning pack (4).

Subtask 21-52-41-020-050-B ** ON A/C NOT FOR ALL

A. Removal of the Cross Beam and the Duct Connectors

Air Duct Connections ** ON A/C NOT FOR ALL

(1) Remove the quick release pins (13) and (14) and the cross beam (11).
(2) Remove the clamp (9) and disconnect the sleeve (10).
(3) Remove the clamp (6) and disconnect the bellows (7).
(4) Remove the clamp (2) and disconnect the bellows (3).
(5) Remove the clamp (30) and move the sleeve (31) on the duct flange (43) (away from the air conditioning pack (4)).
(6) Remove the clamp (34) and move the duct (33) and the sleeve (32) to the air conditioning pack (4).

Subtask 21-52-41-020-050-C ** ON A/C NOT FOR ALL

A. Removal of the Cross Beam and the Duct Connectors

Air Duct Connections ** ON A/C NOT FOR ALL

(1) Remove the quick release pins (13) and (14) and the cross beam (11).
(2) Remove the clamp (9) and disconnect the sleeve (10).
(3) Remove the clamp (6) and disconnect the bellow (7).
(4) Remove the clamp (2) and disconnect the bellow (3).
(5) Remove the clamp (30) and move the sleeve (31) on the duct flange (35) (away from the air conditioning pack (4)).
(6) Remove the clamp (34) and move the duct (33) and the sleeve (32) to the air conditioning pack (4).
(7) For the left air-conditioning pack (10HM):
(a) Do not remove the seals from the duct ends.
(b) Remove the clamps (43) and the sleeves (42).
(c) Remove the nuts (50) and the washers (49).
(d) Hold the ducts (44) and (45) and the bonding strap (47) to remove the screws (46) and the washers (40).
(e) Remove the ducts (44) and (45) and the bonding straps (47) and (48).
(f) Remove and discard the seals (51).

Subtask 21-52-41-020-050-E ** ON A/C NOT FOR ALL

A. Removal of the Cross Beam and the Duct Connections

Air Duct Connections ** ON A/C NOT FOR ALL

(1) Remove the quick-release pins (13) and (14) and the cross beam (11).
(2) Remove the clamp (9) and disconnect the sleeve (10).
(3) Remove the clamps (6) and (53) and disconnect the bellow (7).
(4) Remove the clamp (2) and disconnect the bellow of the air conditioning pack (4).
(5) Remove the clamp (30) and move the sleeve (31) to the duct flange (35).
(6) Remove the clamp (34) and move the duct (33) and the sleeve (32) from the air conditioning pack (4).
(7) Do the steps that follow for the left air-conditioning pack (10HM):
(a) Do not remove the seals from the duct ends.
(b) Remove the clamps (43) and the sleeves (42).
(c) Remove the seals (141) and discard them.
(d) Remove the nuts (50) and the washers (49).
(e) Hold the ducts (44) and (45) and the bonding strap (47), and remove the screws (46) the washers (40) and the heat shield (140).
(f) Remove the bonding strap (47) from the ducts (44) and (45).
(g) Disconnect the bonding strap (48) from the duct (45).
(h) Remove the ducts (44) and (45).
(i) Remove the seals (51) and discard them.

Subtask 21-52-41-020-051-A ** ON A/C NOT FOR ALL

B. Disconnection of the Electrical and Sense Line Connectors

Electrical and Sense Line Connectors ** ON A/C NOT FOR ALL

(1) Disconnect the electrical connectors (52), (53), (56), (59), (62) and (66).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Disconnect the sense lines (57) and (64).
(4) Put the PLUG-BLANKING in each disconnected line end.

Subtask 21-52-41-020-051-C ** ON A/C NOT FOR ALL

B. Disconnection of the Electrical and Sense Line Connectors

Electrical and Sense Line Connectors ** ON A/C NOT FOR ALL

(1) Disconnect the electrical connectors (52), (53), (56), (59), (62), (66) and (67).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Disconnect the sense lines (57) and (64).
(4) Put the PLUG-BLANKING in each disconnected line end.

Subtask 21-52-41-020-051-D ** ON A/C NOT FOR ALL

B. Disconnection of the Electrical and Sense Line Connectors

Electrical and Sense Line Connectors ** ON A/C NOT FOR ALL

(1) Disconnect the electrical connectors (52), (53), (55) and (59).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Disconnect the sense lines (57) and (61).
(4) Put the PLUG-BLANKING in each disconnected line end.

Subtask 21-52-41-020-051-E ** ON A/C NOT FOR ALL

B. Disconnection of the Electrical and Sense Line Connectors

Electrical and Sense Line Connectors ** ON A/C NOT FOR ALL

(1) Disconnect the electrical connectors (52), (53), (55) and (59).
(2) For the left air conditioning pack (10HM):

Disconnect the electrical connectors (63), (65) and (67).

(3) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(4) Disconnect the sense lines (57) and (61).
(5) Put the PLUG-BLANKING in each disconnected line end.

Subtask 21-52-41-020-052-A

C. Removal of the Air Conditioning Pack

Tie Rod and Bonding Connections

(1) Remove the nut (86), the washer (85), the screw (84) and disconnect the bonding straps (87) (if installed) and (88).
(2) Remove the nuts (104), the washers (103), the screws (101) and disconnect the bonding straps (102).

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.

(3) Remove the air conditioning pack:

NOTE: The air conditioning pack weighs approx. 79 kg (180 lb).
You must take care not to bend or twist the air conditioning pack as this can cause damage to the component.
The air conditioning pack must be put on an approbriate support stand when you remove it from the aircraft.

(a) Hold the air conditioning pack and:
1 Remove the nuts (99), the washers (100), the bolts (96), (where fitted the washers (97)), and the bushes (98).
2 Disconnect the tie rods in this order:- (71), (72), (73), (74), (75), (77), (81), (78), (79), (83), (80) and (82).
3 Remove the nut (91), the washer (92), the bolt (89), (where fitted the washer (95)), and the bush (94).
(b) Carefully remove the air conditioning pack from the aircraft.
(4) Put the PLUG-BLANKING in each disconnected line end.

Subtask 21-52-41-020-053-A ** ON A/C NOT FOR ALL

D. Removal of the Attached Components

Attached Components ** ON A/C NOT FOR ALL

Air Duct Connections ** ON A/C NOT FOR ALL

(1) Remove the duct (33) from the sleeve (32).
(2) Remove the sleeve (31) from the aircraft and the sleeve (32) from the heat exchanger unit (4).
(3) For the LEFT air conditioning pack remove and discard the seals (42) from the sleeve (31).
(4) For the RIGHT air conditioning pack remove and discard the seals (142) from the sleeve (31).
(5) For the LEFT air conditioning pack remove and discard the seals (39) and (40), (alternative (41)), from the sleeve (32).
(6) For the RIGHT air conditioning pack remove and discard the seals (139) and (140), (alternative (141)), from the sleeve (32).
(7) Put the PLUG-BLANKING in each disconnected line end.
(8) Remove the nut (126), the washer (125), the bonding strap (88) and the screw (123).
(9) Remove the nuts (129), the washers (128), the screws (121), the seals (122) and (124) and the inlet plenum (127).
(10) Put a protective cover on the cooling elements of the air conditioning pack (4).
(11) If installed: Remove the nut (130), the washer (131), the bonding strap (87) and the screw (132).
(12) Put the PLUG-BLANKING in each disconnected line end.

Subtask 21-52-41-020-053-B ** ON A/C NOT FOR ALL

D. Removal of the Attached Components

Attached Components ** ON A/C NOT FOR ALL

Air Duct Connections ** ON A/C NOT FOR ALL

(1) Remove the duct (33) from the sleeve (32).
(2) Remove the sleeve (31) from the aircraft and the sleeve (32) from the heat exchanger unit (4).
(3) For the LEFT air conditioning pack remove and discard the seals (38) from the sleeve (31).
(4) For the RIGHT air conditioning pack remove and discard the seals (138) from the sleeve (31).
(5) For the LEFT air conditioning pack remove and discard the seals (35) and (36), (alternative (37)), from the sleeve (32).
(6) For the RIGHT air conditioning pack remove and discard the seals (135) and (136), (alternative (137)), from the sleeve (32).
(7) Put the PLUG-BLANKING in each disconnected line end.
(8) Remove the nut (126), the washer (125), the bonding strap (88) and the screw (123).
(9) Remove the nuts (129), the washers (128), the screws (121), the seals (122) and (124) and the inlet plenum (127).
(10) Put a protective cover on the cooling elements of the air conditioning pack (4).
(11) If installed: Remove the nut (130), the washer (131), the bonding strap (87) and the screw (132).
(12) Put the PLUG-BLANKING in each disconnected line end.

Subtask 21-52-41-020-053-C ** ON A/C NOT FOR ALL

D. Removal of the Attached Components

Attached Components ** ON A/C NOT FOR ALL

Air Duct Connections ** ON A/C NOT FOR ALL

(1) Remove the duct (33) from the sleeve (32).
(2) Remove the sleeve (31) from the aircraft and the sleeve (32) from the heat exchanger unit (4).
(3) For the left air conditioning pack (10HM):

Remove and discard the seals (39) from the sleeve (31).

(4) For the right air conditioning pack (11HM):

Remove and discard the seals (139) from the sleeve (31).

(5) For the left air conditioning pack (10HM):

Remove and discard the seals (36) and (37), (alternative (38)), from the sleeve (32).

(6) For the right air conditioning pack (11HM):

Remove and discard the seals (136) and (137), (alternative (138)), from the sleeve (32).

(7) Put the PLUG-BLANKING in each disconnected line end.
(8) For the right air conditioning pack (11HM):
(a) Remove the nut (126), the washer (125), the bonding strap (88) and the screw (123).
(b) Remove the nuts (129), the washers (128), the screws (121), the seals (122) and (124) and the inlet plenum (127).
(c) Put a protective cover on the cooling elements of the air conditioning pack (4).
(9) For the left air conditioning pack (10HM):

Remove the temperature control module (Ref. AMM TASK 21-58-54-000-001).

(10) If installed, remove the nut (130), the washer (131), the bonding strap (87) and the screw (132).
(11) Put the PLUG-BLANKING in each disconnected line end.

Subtask 21-52-41-020-054-A

E. Removal of the Attachment Components

Attachment Components

(1) Remove the nuts (99), the washers (100), the bolts (96), if fitted the washers (97), the bushings (98) and the support rods (71), (72a) and (72b), (73), (74), (75), (77), (78), (79), (80), (81), (82) and (83).

NOTE: Identify the support rods for correct position in the installation procedure.

(2) Remove the nut (2), the washer (1) the bolt (3) and disconnect the support rods (72a) and (72b).
(3) Do the inspection of the components for in-service wear (Ref. AMM TASK 21-52-41-200-001).

[Rev.10 from 2021] 2026.04.01 05:05:14 UTC