R  4. Procedure_________ 
R  (Ref. Fig. 404/TASK 21-26-43-991-033) 
R  Subtask 21-26-43-420-084 
R  A. Installation of the Filter Assembly 
R  (1) Remove the blanking plugs from the disconnected line ends. 
R  (2) Install the filter body (4) with a new seal (11) on the blowing duct 
R  (6). 
R  (3) Install the screws (2) and the nuts (5). Do not fully tighten at this 
R  time. 
R  (4) Install the screws (10) and the nuts (7) with the equipped flange 
R  (12) and tighten. 
R  (5) Tighten the screws (2). 
R  (6) Install the drain hose (8). 
R  (7) Install the clamp (9) and tighten. 
R  (8) Install the flexible sleeve (14). 
R  (9) Install and tighten the clamps (1). 
R  (10) Make sure that the attachments (3) are correctly tightened. 
R  (11) Release each of the four fasteners, open the door and install the 
R  filter cartridge (Ref. TASK 21-26-43-600-019). 
R  (12) Install the demister filter (Ref. TASK 21-26-43-600-018). 
R  5. Close-up________ 
R  Subtask 21-26-43-410-091 
R  A. Close Access 
R  (1) Make sure that the work area is clean and clear of tool(s) and other 
R  items. 
R  (2) Close the access door 824 (Ref. TASK 52-41-00-410-002).

R  (3) Remove the access platform(s). 
R  Subtask 21-26-43-865-126 
R  B. Remove the safety clip(s) and the tag(s) and close this(these) circuit 
R  breaker(s): 
R  1HQ, 2HQ, 3HQ, 5HQ, 6HQ 
R  Subtask 21-26-43-861-121 
R  C. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002). 
R  Subtask 21-26-43-862-116 
R  D. De-energize the ground service network (Ref. TASK 24-42-00-862-001).

R **ON A/C 001-049, 101-149, 151-199, 201-299,
R Post SB 21-1087 For A/C 001-049,101-105,

R  FILTER ASSY - AVIONICS VENTILATION - ADJUSTMENT/TEST____________________________________________________
 TASK 21-26-43-710-001
 Operational Test of the Check Valve of the Syphon Assembly
 1. Reason for the Job
__________________
 Refer to the MPD TASK: 212643-09
 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
21-26-43-100-001 Inspection of the Siphon Assembly (Strainer) for Cleanliness 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power 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 21-26-43-991-016 Fig. 501
R 1EFF : 001-049, 101-149, 151-199, 201-299, 1 21-26-43Page 501 1 1 May 01/05 1 1 1CES 1

 3. Job Set-up
__________ Subtask 21-26-43-865-087
 A. Make sure that this(these) circuit breaker(s) is(are) closed:
 -------------------------------------------------------------------------------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 123VU AVNCS VENT/BLOWER/FAN 1HQ AD10 123VU AVNCS VENT/EXTC/FAN 2HQ AE02
 Subtask 21-26-43-941-067
 B. Safety Precautions
 (1) Make sure that the throttle control levers of the engines 1 and 2 are at idle.
 Subtask 21-26-43-861-086
 C. Energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-861-002).

 Subtask 21-26-43-860-055
 D. Aircraft Maintenance Configuration
 (1) On the VENTILATION section of the panel 22VU:
 -make sure that the BLOWER and EXTRACT pushbutton switches are in the AUTO configuration (pushed and with the FAULT and OVRD legends off).
 4. Procedure
_________ (Ref. Fig. 501/TASK 21-26-43-991-016) Subtask 21-26-43-710-054
 A. Operational Test of the Check Valve of the Syphon Assembly NOTE : The energization of the aircraft electrical circuits starts a full
　
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