Remove Primary and Main Heat Exchangers for In Shop Cleaning

TASK 21-52-00-100-001-A
Remove Primary and Main Heat Exchangers for In Shop Cleaning

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: MAKE SURE THAT THE SAFETY DEVICES AND THE WARNING NOTICES ARE IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

NOTE: The procedure to remove the primary and main heat exchangers is the same for the left and right side.

ZONE: 191
ZONE: 192
FIN: 10HM6
FIN: 10HM7
FIN: 11HM6
FIN: 11HM7

1. Reason for the Job
Refer to the MPD TASK: 215200-01
REMOVE PRIMARY AND MAIN HEAT EXCHANGERS FOR IN SHOP CLEANING.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
191	AIR CONDITIONING COMPT AND FAIRINGS
192	AIR CONDITIONING COMPT AND FAIRINGS
FOR [10HM6] (HEAT EXCHANGER-PRIMARY)
191KB
FOR [10HM7] (HEAT EXCHANGER-MAIN)
191KB
FOR [11HM6] (HEAT EXCHANGER-PRIMARY)
192KB
FOR [11HM7] (HEAT EXCHANGER-MAIN)
192KB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 21-52-25-000-001-A	Removal of the Primary Heat Exchanger
TASK 21-52-25-400-001-A	Installation of the Primary Heat Exchanger
TASK 21-52-26-000-001-A	Removal of the Main Heat Exchanger
TASK 21-52-26-400-001-A	Installation of the Main Heat Exchanger
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 53-35-13-000-002-A	Removal of the Quick-Release Access Panels from the Belly Fairing Structure
TASK 53-35-13-400-002-A	Installation of the Quick-Release Access Panels on the Belly Fairing Structure
Primary and Main Heat Exchangers

3. Job Set-up
Subtask 21-52-00-861-053-A

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

Subtask 21-52-00-865-055-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 10HM7 (HEAT EXCHANGERMAIN) FOR FIN: 10HM6 (HEAT EXCHANGERPRIMARY)
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: 11HM7 (HEAT EXCHANGERMAIN) FOR FIN: 11HM6 (HEAT EXCHANGERPRIMARY)
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 21-52-00-010-051-A

C. Get Access

Primary and Main Heat Exchangers

(1) Remove the access panel(s) (Ref. AMM TASK 53-35-13-000-002):
(a) FOR [10HM6] (HEAT EXCHANGER-PRIMARY)

191KB.

(b) FOR [10HM7] (HEAT EXCHANGER-MAIN)

191KB.

192KB.

(d) FOR [11HM7] (HEAT EXCHANGER-MAIN)

192KB.

4. Procedure
Subtask 21-52-00-100-050-A

A. Cleaning of the main heat exchanger and the primary heat exchanger
(1) Remove the main heat exchanger (Ref. AMM TASK 21-52-26-000-001) and the primary heat exchanger (Ref. AMM TASK 21-52-25-000-001).
(2) Send the main heat exchanger and the primary heat exchanger to the shop for cleaning.
(3) Install a new or serviceable main heat exchanger (Ref. AMM TASK 21-52-26-400-001) and a new or serviceable primary heat exchanger (Ref. AMM TASK 21-52-25-400-001).

5. Close-up
Subtask 21-52-00-410-051-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(s) (Ref. AMM TASK 53-35-13-400-002):
(a) FOR [10HM6] (HEAT EXCHANGER-PRIMARY)

191KB.

(b) FOR [10HM7] (HEAT EXCHANGER-MAIN)

191KB.

192KB.

(d) FOR [11HM7] (HEAT EXCHANGER-MAIN)

192KB.

Subtask 21-52-00-865-079-A

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
FOR FIN: 10HM7 (HEAT EXCHANGERMAIN) FOR FIN: 10HM6 (HEAT EXCHANGERPRIMARY)
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: 11HM7 (HEAT EXCHANGERMAIN) FOR FIN: 11HM6 (HEAT EXCHANGERPRIMARY)
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 21-52-00-862-052-A

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

[Rev.10 from 2021] 2026.04.02 06:11:25 UTC