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 21-26-56-010-050
 C. Put an access platform in position on the left side of the aircraft, below the valve.

 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 21-26-56-020-050
 A. Removal of the Air Inlet Check Valve
 (1) Remove the clamps (1). NOTE : Do not discard the clamps (1). You must keep and use them
____
 during the installation procedure.
 (2)
 Move the flexible sleeve (13) to disengage the assembly (4).

 (3)
 Remove the clamp (12).

 (4)
 Disconnect the drain hose (11).

 (5)
 Remove the nuts (5) and the screws (2).

 (6)
 Hold the assembly (4) and remove the clamp (7).

 (7)
 Remove the assembly (4).

 (8)
 Remove and discard the O-ring (6).

 (9)
 Remove the 6 screws (10) and the washers (9).

 (10) Remove the check valve (8).
 (11) Put blanking plugs on the disconnected line ends.
 **ON A/C 051-052,

 Subtask 21-26-56-020-050-A
 A. Removal of the Air Inlet Check Valve
 (1)
 Remove the clamps (1).

 (2)
 Move the flexible sleeve (13) to disengage the assembly (4).

 Air Inlet Check Valve Figure 401/TASK 21-26-56-991-001
 1EFF : 1 1R 1CES  ALL  1 11 1 21-26-56 Page 404 May 01/05

R  (3) Remove the clamp (12). 
R  (4) Disconnect the drain hose (11). 
R  (5) Remove the nuts (5) and the screws (2). 
R  (6) Hold the assembly (4) and remove the clamp (7). 
R  (7) Remove the assembly (4). 
R  (8) Remove and discard the O-ring (6). 
R  (9) Remove the 6 screws (10) and the washers (9). 
R  (10) Remove the check valve (8). 
R  (11) Put blanking plugs on the disconnected line ends. 

R 1EFF : 051-052, 1 21-26-56Page 405 1 1 May 01/05 1 1 1CES 1

R  **ON A/C ALL
 TASK 21-26-56-400-001
 Installation of the Air Inlet Check Valve (2150HM)
 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 m (3 ft. 3 in.)
 B. Expendable Parts
 -------------------------------------------------------------------------------
FIG.ITEM |DESIGNATION  |IPC-CSN
 -------------------------------------------------------------------------------
R  6 O-ring 21-26-01 03A-050
R  6 O-ring 21-26-01 03E-050 6 O-ring 21-26-01 03K-050 6 O-ring 21-26-01 03L-050 6 O-ring 21-26-01 03N-050
 C. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
21-26-00-710-001 Operational Check of System via MCDU 24-42-00-861-001 Energize the Ground Service Network from the External Power 24-42-00-862-001 De-energize the Ground Service Network Supplied from the External Power 21-26-56-991-001 Fig. 401

 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 21-26-56-860-050
 A. Aircraft Maintenance Configuration
 (1) Make sure that the ground service network is energized (Ref. TASK 24-42-00-861-001).
 Subtask 21-26-56-010-051
 B. Get Access
 (1) Make sure that the access platform is in position on the left side of the aircraft, below the valve.
 Subtask 21-26-56-865-051
 C. 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
　
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