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-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------122VU AIR COND/PACK TEMP/CTL SYS1/2/28VDC 23HH W21 122VU AIR COND/PACK TEMP CTL SYS2/2/28VDC 24HH Y21 122VU AIR COND/PACK TEMP CTL SYS2/2/115VAC 22HH Y20
Subtask 21-51-51-941-050
C. Safety Precautions
(1)
On the panel 30VU:
(a)
Make sure that:
-
the APU BLEED pushbutton switch is in the off position (the ON legend is off) and,
-
the ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in the off position (the OFF legends are on).
(b)
Put a warning notice in position to tell persons not to operate these pushbutton switches.
(2)
On the HP ground connector put a warning notice in position to tell persons not to supply the ground air.
Subtask 21-51-51-010-051
D. Get Access
(1) Remove the access panels (Ref. TASK 53-35-13-000-002): R (a) FOR 11HB 191KB and 191BB. R (b) FOR 8HB
192KB 191BB. R **ON A/C 001-049, 101-105, 151-199,
Subtask 21-51-51-010-057-A
E. Removal of the Ozone Filter for Accesss
(1) Remove the ozone filter upstream of the flow control valve (Ref. TASK 21-51-41-000-001).
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Subtask 21-51-51-010-057
E. Removal of the Air Duct upstream of the Flow Control Valve for Accesss
(1) Remove the air duct upstream of the flow control valve (Ref. TASK 21-51-51-000-002).
R **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
4. Procedure
_________ R **ON A/C 001-003, 051-054,
Subtask 21-51-51-020-057
A. Removal of the Pack Flow-Control Valve
(Ref. Fig. 401/TASK 21-51-51-991-001-C)
(1)
Disconnect the electrical connector (4).
(2)
Put blanking caps on the disconnected electrical connectors.
(3)
Release the sense line quick-disconnects (2), (3) and (5).
(4)
Put blanking plugs on the disconnected line ends.
(5)
Remove the nut (23), the washer (24), the screw (18) and disconnect the bonding strap (25).
(6)
Remove the clamp (16).
(7)
Move the flange (13) and the sleeve (14) as far to the heat exchanger unit as they will go.
(8)
Hold the pack flow-control valve (17) and remove the nuts (22), the washers (21), the bolts (19) and the spacers (20).
(9)
Carefully remove the pack flow-control valve (17) from the aircraft.
(10) Remove the flange (13) together with the sleeve (14) from the heat exchanger unit connecting-end (15).
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(11)
Remove the flange (13) from the sleeve (14).
(12)
Remove and discard the seals (31(131)) from the sleeve (14).
(13)
Put protective covers on the open ends of the pack flow-control valve
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