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

 4. Procedure
_________ (Ref. Fig. 401/TASK 21-26-56-991-001) R **ON A/C 001-049, 053-099, 101-149, 151-199, 201-299, 301-399, 401-499,
 Subtask 21-26-56-420-050
 A. Installation of the Air Inlet Check Valve
 (1)
 Clean the component interface and/or the adjacent area.

 (2)
 Do an inspection of the component interface and/or the adjacent area.

 (3)
 Remove the blanking plugs from the disconnected line ends.

 (4)
 Install the check valve (8). NOTE : Make sure that the flaps of the check valve open inboard.

____

 (5)
 Align the attachment holes and install the screws (10) and the washers (9).

 NOTE : The interval between the attachment holes is not the same.
____ This is to make sure that the check valve is in the correct angular position when the holes are aligned.
 (6)
 Install the assembly (4) with the new O-ring (6).

 (7)
 Install the clamp (7).

 (8)
 Make sure that the assembly (4) is in the correct position.

 (9)
 Install the screws (2) and the nuts (5). Do not fully tighten them at this time.

 (10)
 Tighten the clamp (7) to the torque value given on the clamp.

 (11)
 Tighten the screws (2) and the nuts (5).

 (12)
 Connect the drain hose (11).

 (13)
 Install the clamp (12) and tighten it.

 (14) Put the flexible sleeve (13) in position.
 (15) Install the clamps (1) and tighten them.
 NOTE : Use the clamps (1) kept during the removal procedure.____ 
R  **ON A/C 051-052, 
R  Subtask 21-26-56-420-050-A 
R  A. Installation of the Air Inlet Check Valve 
R  (1) Clean the component interface and/or the adjacent area. 
R  (2) Do an inspection of the component interface and/or the adjacent area. 
R  (3) Remove the blanking plugs from the disconnected line ends. 
R  (4) Install the check valve (8). 
R  NOTE : Make sure that the flaps of the check valve open inboard.____ 
R  (5) Align the attachment holes and install the screws (10) and the 
R  washers (9). 
R  NOTE : The interval between the attachment holes is not the same.____ 
R  This is to make sure that the check valve is in the correct 
R  angular position when the holes are aligned. 
R  (6) Install the assembly (4) with the new O-ring (6). 
R  (7) Install the clamp (7). Do not fully tighten at this time. 
R  (8) Make sure that the assembly (4) is in the correct position. 
R  (9) Install the screws (2) and the nuts (5). Do not fully tighten them at 
R  this time. 
R  (10) Tighten the clamp (7) to the torque value given on the clamp. 
R  (11) Tighten the screws (2) and the nuts (5). 
R  (12) Connect the drain hose (11). 
R  (13) Install the clamp (12) and tighten it.

R  (14) Put the flexible sleeve (13) in position. 
R  (15) Install the clamps (1) and tighten them. 
R  **ON A/C ALL
 Subtask 21-26-56-865-052
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1HQ, 2HQ, 3HQ, 5HQ, 6HQ.
 Subtask 21-26-56-710-050
 C. Do the operational test of the avionics equipment ventilation from the Multipurpose Control and Display Unit (MCDU) (Ref. TASK 21-26-00-710-001).
 5. Close-up________
 Subtask 21-26-56-410-050
 A. Close Access
 (1) Make sure that the work area is clean and clear of tool(s) and other items.
 (2) Remove the access platform(s).
 Subtask 21-26-56-862-051
 B. De-energize the ground service network (Ref. TASK 24-42-00-862-001).

 CHECK VALVE - AIR INLET (2150HM) - ADJUSTMENT/TEST
__________________________________________________ TASK 21-26-56-280-002 R Operational Check of Air Inlet Check Valve 2150HM
 1.
 Reason for the Job

__________________
 Refer to the MPD TASK: 212600-08

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
　
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