Check Valve of the Avionics Ventillation Water / Dust Separation
Figure 501/TASK 21-26-43-991-016
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(1)
Make sure that the bowl of the syphon is clean.
(a) If there are debris, clean the syphon assembly (Ref. TASK 21-26-43-100-001).
(2)
Make sure that the ball of the check valve moves up.
(3)
De-energize the aircraft electrical circuits
(Ref. TASK 24-41-00-862-002).
Subtask 21-26-43-861-090
B. Energize the ground service network
(Ref. TASK 24-42-00-861-001)
(1) Make sure that the ball of the check valve moves down.
5. Close-up
________ Subtask 21-26-43-862-086
A. De-energize the ground service network
(Ref. TASK 24-42-00-862-001)
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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 - CLEANING/PAINTING______________________________________________________
TASK 21-26-43-100-001
Inspection of the Siphon Assembly (Strainer) for Cleanliness
1. Reason for the Job__________________
Refer to the MPD TASK: 212643-10
2. Job Set-up Information______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific No specific No specific circuit breaker(s) safety clip(s)warm water and liquid detergent soap (non-foaming)access platform 1.6 m (5 ft. 3 in.)
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
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
52-41-00-410-002 Close the Avionics Compartment Doors after Access
21-26-43-991-017 Fig. 701
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.
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A. Energize the ground service network (Ref. TASK 24-42-00-861-001). Subtask 21-26-43-865-090
B. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------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 21-26-43-010-079
C. Get Access
(1)
Put the access platform in position below the access door 824.
(2)
Open the access door 824.
4. Procedure
_________ (Ref. Fig. 701/TASK 21-26-43-991-017) Subtask 21-26-43-020-067
A. Removal of the Syphon Assembly
(1) Remove the twelve screws (2) and the washers (1).
(2) Remove the syphon assembly (3) from the filter housing. Subtask 21-26-43-160-064
B. Cleaning of the Syphon Assembly
(1) Clean the inner floor of the filter housing and the area around the syphon assembly (3) with warm water and liquid detergent soap (non-foaming).
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Syphon Assembly
Figure 701/TASK 21-26-43-991-017
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(2) Make sure that the plastic check valve (4) is clear of any debris.
(a) If there is debris, turn the check valve (4) to put the bottom up and flush the syphon with the flow in the opposite direction.
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