_______ 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 21-26-51-861-050
A. Energize the ground service network
(Ref. TASK 24-42-00-861-001).
Subtask 21-26-51-865-050
B. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 18HQ
49VU AIR COND/AVNCS VENT/CTL 6HQ D06
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 301-399,
123VU AVNCS VENT/EXTC/FAN 2HQ AC04 **ON A/C ALL
FOR 20HQ 49VU AIR COND/AVNCS VENT/CTL 5HQ D05 123VU AVNCS VENT/BLOWER/FAN 1HQ AD10
Subtask 21-26-51-010-050
C. Get Access
(1)
Put the access platform in position at the access door 824.
(2)
Open the access door 824.
4. Procedure
_________ (Ref. Fig. 401/TASK 21-26-51-991-001, 402/TASK 21-26-51-991-002) R **ON A/C 001-049, 053-099, 101-149, 151-199, 201-299, 301-399, 401-499,
Subtask 21-26-51-020-050
A. Removal of the Blower and Extract Fans (18HQ, 20HQ)
(1)
Disconnect the electrical connector (4) from the fan (5).
(2)
Put blanking caps on the disconnected electrical connectors.
(3)
Remove the clamps (7) and (9). NOTE : Do not discard the clamps (7) and (9). You must keep and use
____
them during the installation procedure.
(4)
Move the flexible sleeve (8) on the pipe (10) to release the fan (5).
(5)
Remove the clamp (2).
(6)
Hold the fan (5), open the clamps (6) and remove the fan (5).
(7)
Remove and discard the O-ring (3).
(8)
Remove the flexible sleeve (8).
(9) Put blanking plugs on the disconnected line ends.
**ON A/C 051-052,
Subtask 21-26-51-020-050-A
A. Removal of the Blower and Extract Fans (18HQ, 20HQ)
(1)
Disconnect the electrical connector (4) from the fan (5).
(2)
Put blanking caps on the disconnected electrical connectors.
(3)
Remove the clamps (7) and (9).
(4)
Move the flexible sleeve (8) on the pipe (10) to release the fan (5).
Extract Fan Figure 401/TASK 21-26-51-991-001
1EFF : 1 1R 1CES ALL 1 11 1 21-26-51 Page 404 May 01/05
Blower Fan Figure 402/TASK 21-26-51-991-002
1EFF : 1 1R 1CES ALL 1 11 1 21-26-51 Page 405 May 01/05
R (5) Remove the clamp (2).
R (6) Hold the fan (5), open the clamps (6) and remove the fan (5).
R (7) Remove and discard the O-ring (3).
R (8) Remove the flexible sleeve (8).
R (9) Put blanking plugs on the disconnected line ends.
R 1EFF : 051-052, 1 21-26-51Page 406 1 1 May 01/05 1 1 1CES 1R **ON A/C ALL
TASK 21-26-51-400-001
Installation of the Blower and Extract Fans (18HQ, 20HQ)
1. Reason for the Job
__________________
Self Explanatory
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
-------------------------------------------------------------------------------
No specific platform 1.6 m (5 ft. 3 in.)
B. Expendable Parts
-------------------------------------------------------------------------------
FIG.ITEM |DESIGNATION |IPC-CSN
-------------------------------------------------------------------------------
3 O-ring 21-26-01 08A-030 3 O-ring 21-26-01 08B-030
C. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
21-26-00-710-001 Operational Check of System via MCDU 21-26-51-710-001 Operational Test of the Blower and Extract Fans (18HQ, 20HQ) (without the CFDS) 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
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