Removal of the Skin Heat Exchanger

TASK 21-26-45-000-001-A
Removal of the Skin Heat Exchanger

CAUTION: USE ONLY THE GROUND SERVICE NETWORK TO SUPPLY ELECTRICITY BECAUSE THE AVIONICS VENTILATION SYSTEM IS NOT SERVICEABLE. IF YOU ENERGIZE THE AIRCRAFT ELECTRICAL CIRCUITS WITHOUT THE VENTILATION SYSTEM YOU WILL CAUSE DAMAGE TO ELECTRICAL EQUIPMENT.

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
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
824

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 25-31-41-000-001-A	Removal of the Forward Galley Unit
TASK 25-41-41-000-001-A	Removal of Lavatory A
TASK 25-41-41-000-001-B	Removal of Lavatory A
TASK 25-80-00-000-001-A	Removal of the Insulation Blankets
Skin Heat Exchanger

3. Job Set-up
Subtask 21-26-45-861-050-A

A. Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).

Subtask 21-26-45-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR COND/AVNCS VENT/CTL	6HQ	D06

Subtask 21-26-45-010-050-A

C. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the access door 824.
(2) Open the access door 824.

4. Procedure
Subtask 21-26-45-020-050-A

A. Removal of the Skin Heat Exchanger
(1) Remove the lavatory A, if install (Ref. AMM TASK 25-41-41-000-001).
(2) Remove the galley unit at location 1, if install (Ref. AMM TASK 25-31-41-000-001).
(3) Remove all the insulation blankets between FR12 and FR14 above and below the floor panels (Ref. AMM TASK 25-80-00-000-001).
(4) Remove the skin heat exchanger:
(a) Remove the screws (1).
(b) Remove the washers (2).
(c) Remove the panels (3) of the skin heat exchanger.

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