(4)
 Make sure that the access platform is in position.

 (5)
 Make sure that the clamps, the flexible sleeves and the duct are in the correct condition.

 Subtask 21-26-42-010-051
 B. Make sure that the access door is open 822.
 4. Procedure
_________ (Ref. Fig. 401/TASK 21-26-42-991-001) R **ON A/C 001-049, 053-099, 101-149, 151-199, 201-299, 301-399, 401-499,
 Subtask 21-26-42-420-050
 A. Installation of the Avionics Equipment Ventilation Duct
 (1)
 Clean the component interface and/or the adjacent area.

 (2)
 Remove the blanking plugs from the disconnected line ends.

 (3)
 Put the bracket (8) in position on the duct (10).

 (4)
 Install the clamp (9). Do not tighten at this time.

 (5) Install the flexible sleeve (11) on the duct (13).
 (6) Install the flexible sleeve (1) on the duct (2).
 (7) Install the duct (4).
 (8) Put the flexible sleeves (11) and (1) in position.
 (9) Install the clamps (3) and tighten them.
 NOTE : Use the clamps (3) kept during the removal procedure.____
 (10) Install the clamps (12) and tighten them.
 NOTE : Use the clamps (12) kept during the removal procedure.____
 (11) Install the clamps (7) and tighten it.
 (12) Tighten the clamp (9).
 (13) Connect the flexible hose (6).
 (14) Install the clamp (5) and tighten it. 
R  **ON A/C 051-052, 
R  Subtask 21-26-42-420-050-A 
R  A. Installation of the Avionics Equipment Ventilation Duct 
R  (1) Clean the component interface and/or the adjacent area. 
R  (2) Remove the blanking plugs from the disconnected line ends. 
R  (3) Put the bracket (8) in position on the duct (10). 
R  (4) Install the clamp (9). Do not tighten at this time. 
R  (5) Install the flexible sleeve (11) on the duct (13). 
R  (6) Install the flexible sleeve (1) on the duct (2). 
R  (7) Install the duct (4). 
R  (8) Put the flexible sleeves (11) and (1) in position.

R  (9) Install the clamps (3) and tighten them. 
R  (10) Install the clamps (12) and tighten them. 
R  (11) Install the clamps (7) and tighten it. 
R  (12) Tighten the clamp (9). 
R  (13) Connect the flexible hose (6). 
R  (14) Install the clamp (5) and tighten it. 
R  **ON A/C ALL
 5. Close-up________
 Subtask 21-26-42-410-050
 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 21-26-42-862-051
 B. De-energize the ground service network (Ref. TASK 24-42-00-862-001).

 TASK 21-26-42-000-002 Removal of the Avionics Equipment Blowing and Extraction Ducts
 1.
 Reason for the Job

__________________
 To do the maintenance of the strake on the right side of the fuselage.

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking plugs
 No specific circuit breaker(s) safety clip(s)
 No specific access platform 1.60 m (5 ft. 3 in.)

 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-42-00-861-001 Energize the Ground Service Network from the External
 Power 53-12-13-000-001 Removal of the avionics compartment floor panels 21-26-42-991-009 Fig. 402 21-26-42-991-010 Fig. 403
 3. Job Set-up
__________
 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.
 Subtask 21-26-42-861-058
 A. Energize the ground service network
 (Ref. TASK 24-42-00-861-001).

 1EFF : ALL 1 21-26-42Page 409 1 1 May 01/05R 1 1 1CES 1

 Subtask 21-26-42-865-059
　
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