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 21-26-41-860-050
 A. Aircraft Maintenance Configuration
 (1) Make sure that the ground service network is energized (Ref. TASK 24-42-00-861-001).
 Subtask 21-26-41-865-051
 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AIR COND/AVNCS VENT/CTL 6HQ D06 49VU AIR COND/AVNCS VENT/CTL 5HQ D05 122VU AIR COND/AVNCS/VENT/MONG 3HQ Y17

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 123VU AVNCS VENT/EXTC/FAN 2HQ AE02 **ON A/C ALL
 123VU AVNCS VENT/BLOWER/FAN 1HQ AD10 **ON A/C 301-399,
 123VU AVNCS VENT/EXTC/FAN 2HQ AC04

 **ON A/C ALL

 Subtask 21-26-41-010-051
 C. Get Access
 (1)
 Make sure that the platform is in position at the access door 824.

 (2)
 Make sure that the access door 824 is open.

 4. Procedure
_________ R **ON A/C 001-049, 053-099, 101-149, 151-199, 201-299, 301-399, 401-499,
 Subtask 21-26-41-420-052
 A. Installation of the Check Valve
 (1)
 Remove the blanking plugs from the disconnected line ends.

 (2)
 Install the flexible sleeve (3).

 (3)
 Put the check valve (4) in position. NOTE : The arrow that indicates the air flow points to the left.

____

 (4)
 Install the washers (5), the screws (6) and tighten.

 (5)
 Install the clamps (2) and tighten. NOTE : Use the clamps (2) kept during the removal procedure.

____

 (6)
 Install the flexible sleeve (7).

 (7)
 Install the new O-ring (12) in the fan (13) groove.

 (8)
 Put the duct (10) in position.

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

 (10)
 Install the clamps (8) and tighten. NOTE : Use the clamps (8) kept during the removal procedure.

 (11)
 Install the drain hose (15) to the duct (10).

____

 (12) Install the clamp (14) and tighten it.
 (13) Make sure that the O-ring (12) is correctly installed in the fan (13)
 groove.
 (14) Install the clamp (11) and torque them to the value given on the
 clamp.
 (15) Tighten the clamp (9). 
R  **ON A/C 051-052, 
R  Subtask 21-26-41-420-052-A 
R  A. Installation of the Check Valve 
R  (1) Remove the blanking plugs from the disconnected line ends. 
R  (2) Install the flexible sleeve (3). 
R  (3) Put the check valve (4) in position. 
R  NOTE : The arrow that indicates the air flow points to the left.____ 
R  (4) Install the washers (5), the screws (6) and tighten. 
R  (5) Install the clamps (2) and tighten. 
R  (6) Install the flexible sleeve (7). 
R  (7) Install the new O-ring (12) in the fan (13) groove. 
R  (8) Put the duct (10) in position. 
R  (9) Install the clamp (9). Do not fully tighten at this time. 
R  (10) Install the clamps (8) and tighten. 
R  (11) Install the drain hose (15) to the duct (10). 
R  (12) Install the clamp (14) and tighten it. 
R  (13) Make sure that the O-ring (12) is correctly installed in the fan (13) 
R  groove.

R R  (14) Install the clamp (11) and torque them to the value given on the clamp. 
R  (15) Tighten the clamp (9). 
R  **ON A/C ALL
 5. Close-up________
 Subtask 21-26-41-410-050
 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 21-26-41-865-052
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1HQ, 2HQ, 3HQ, 5HQ, 6HQ
 Subtask 21-26-41-862-051
 C. De-energize the ground service network (Ref. TASK 24-42-00-862-001).

 TASK 21-26-41-000-002 Removal of the Air Extraction Duct
　
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