Subtask 21-26-42-941-050
B. Safety Precautions
(1)
On the AIR COND panel 30VU:
(a)
Make sure that the APU BLEED, all ENG BLEED and the PACK 1(2) pushbutton switches are released.
(b)
Put a warning notice in position to tell persons not to operate these pushbutton switches.
(2)
On the HP and LP ground connectors, put a warning notice in position to tell persons not to supply the ground air sources.
Subtask 21-26-42-010-050
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 21-26-42-991-001) R **ON A/C 001-049, 053-099, 101-149, 151-199, 201-299, 301-399, 401-499,
Subtask 21-26-42-020-050
A. Removal of the Avionics Equipment Ventilation Duct
(1)
Remove the clamp (5).
(2)
Disconnect the flexible hose (6).
(3)
Remove the clamp (7).
(4)
Remove the clamps (3) and (12). NOTE : Do not discard the clamps (3) and (12). You must keep and use
(5)
Move the flexible sleeves (1) and (11) to disengage the duct (4).
____ them during the installation procedure.
Avionics Equipment Ventilation Duct
Figure 401/TASK 21-26-42-991-001
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(6) Remove the duct (4).
(7) Remove the flexible sleeves (1) and (11).
(8) Remove the clamp (9) and the bracket (8).
(9) Put blanking plugs on the disconnected line ends.
R **ON A/C 051-052,
R Subtask 21-26-42-020-050-A
R A. Removal of the Avionics Equipment Ventilation Duct
R (1) Remove the clamp (5).
R (2) Disconnect the flexible hose (6).
R (3) Remove the clamp (7).
R (4) Remove the clamps (3) and (12).
R (5) Move the flexible sleeves (1) and (11) to disengage the duct (4).
R (6) Remove the duct (4).
R (7) Remove the flexible sleeves (1) and (11).
R (8) Remove the clamp (9) and the bracket (8).
R (9) Put blanking plugs on the disconnected line ends.
R **ON A/C ALL
TASK 21-26-42-400-001
Installation of the Avionics Equipment Ventilation Duct
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.
1. Reason for the Job
__________________
Self Explanatory
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
-------------------------------------------------------------------------------
No specific warning notice
No specific 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 21-26-42-991-001 Fig. 401
3. Job Set-up
__________
Subtask 21-26-42-860-050
A. Aircraft Maintenance Configuration
(1)
Make sure that the ground service network is energized (Ref. TASK 24-42-00-861-001).
(2)
On the AIR COND panel 30VU:
(a)
Make sure that the APU BLEED, all ENG BLEED and the PACK 1(2) pushbutton switches are released.
(b)
Make sure that a warning notice in position to tell persons not to operate these pushbutton switches.
(3)
On the HP and LP ground connectors, make sure that a warning notice is in position to tell persons not to supply the ground air sources.
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