(2)
 Install the twelve washers (1), the screws (2) and tighten.

 5. Close-up
________ Subtask 21-26-43-410-076
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Close the access door 824 (Ref. TASK 52-41-00-410-002).

 (3) Remove the access platform(s). Subtask 21-26-43-865-091
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1HQ, 2HQ, 3HQ, 5HQ, 6HQ
 Subtask 21-26-43-862-089
 C. De-energize the ground service network (Ref. TASK 24-42-00-862-001).
R 1EFF : 001-049, 101-149, 151-199, 201-299, 1 21-26-43Page 704 1 1 May 01/05 1 1 1CES 1

 HEAT EXCHANGER - SKIN - REMOVAL/INSTALLATION
____________________________________________ TASK 21-26-45-000-001 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 circuit breaker(s) safety clip(s) No specific access platform 1.6 m (5 ft. 3 in.)
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-42-00-861-001 Energize the Ground Service Network from the External
 Power 25-31-41-000-001 Removal of the FWD Galley Unit (6475MM) 25-41-41-000-001 Removal of the Lavatory A 25-80-00-000-001 Removal of the Insulation Blankets 21-26-45-991-001 Fig. 401
 3. Job Set-up
__________ Subtask 21-26-45-861-050
 A. Energize the ground service network
 (Ref. TASK 24-42-00-861-001).

 Subtask 21-26-45-865-050
 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AIR COND/AVNCS VENT/CTL 6HQ D06
 Subtask 21-26-45-010-050
 C. Get Access
 (1)
 Put the access platform in position at the access door 824.

 (2)
 Open the access door 824.

 4. Procedure
_________
 (Ref. Fig. 401/TASK 21-26-45-991-001) Subtask 21-26-45-020-050
 A. Removal of the Skin Heat Exchanger
 (1)
 Remove the lavatory A (Ref. TASK 25-41-41-000-001).

 (2)
 Remove the galley unit at location 1 (Ref. TASK 25-31-41-000-001).

 (3)
 Remove all the insulation blankets between FR12 and FR14 above and below the floor panels (Ref. 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.

 Skin Heat Exchanger
 Figure 401/TASK 21-26-45-991-001
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1  1  Feb 01/98
 1  1
 1CES  1

 TASK 21-26-45-400-001 Installation 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  access platform 1.6 m (5 ft. 3 in.)
　
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