_______ 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 21-26-43-860-052
A. Make sure that the ground service network is energized (Ref. TASK 24-42-00-861-001).
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B. Get Access
(1) Make sure that the access platform is in position below the rear avionics compartment door (824).
(2) Make sure that the access door 824 is open. Subtask 21-26-43-865-073
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 123VU AVNCS VENT/BLOWER/FAN 1HQ AD10 123VU AVNCS VENT/EXTC/FAN 2HQ AE02
4. Procedure
_________
(Ref. Fig. 401/TASK 21-26-43-991-010) Subtask 21-26-43-420-060
A. Installation of the Filter Assembly
(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 filter body (3).
(5)
Install the screws (1) and the nuts (2). Do not fully tighten at this time.
(6)
Attach the bonding strap (12) to the filter body (3) with the screw (11), the washer (10) and the nut (9). Tighten the nut (9).
(7)
Install the drain hose (6).
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(8)
Install the clamp (7) and tighten.
(9)
Tighten the screws (1).
(10)
Install the flexible sleeve (5).
(11)
Install and tighten the clamps (4). NOTE : Use the clamps (4) kept during the removal procedure.
____
(12)
Make sure that the attachments (8) are correctly tightened.
(13)
Release the two fastener devices, open the door and install the filter as mentioned in (Ref. TASK 21-26-43-920-001).
5. Close-up
________ Subtask 21-26-43-410-063
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 21-26-43-865-074
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1HQ, 2HQ, 3HQ, 5HQ, 6HQ
Subtask 21-26-43-862-071
C. De-energize the ground service network (Ref. TASK 24-42-00-862-001).
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TASK 21-26-43-920-001
Replacement of the Filter Cartridge
1. Reason for the Job__________________
Refer to the MPD TASK: 212643-07
2. Job Set-up Information______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific No specific circuit breaker(s) safety clip(s)access platform 1.6 m (5 ft. 3 in.)
R B. Expendable Parts
R R R -------------------------------------------------------------------------------FIG.ITEM |DESIGNATION |IPC-CSN -------------------------------------------------------------------------------
R R 3 3 filter cartridge filter cartridge 21-26-43 01B-020 21-26-43 01B-020A
R C. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-42-00-861-001 24-42-00-862-001 21-26-43-991-018 Energize the Ground Service Network from the External PowerDe-energize the Ground Service Network Supplied from the External PowerFig. 402
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