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Subtask 21-51-51-941-053
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 21-51-51-010-060
D. Get Access
(1) Remove the access panels (Ref. TASK 53-35-13-000-002): R (a) FOR 23HB 191KB and 191BB. R (b) FOR 24HB
192KB 191BB.
Subtask 21-51-51-010-061
E. Removal of the Air Duct upstream of the Flow Control Unit for Accesss
(1) Remove the air duct (Ref. TASK 21-51-51-000-002).
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4. Procedure
_________
Subtask 21-51-51-020-067
A. Removal of the Pack Flow-Control Unit R **ON A/C 401-499,
(Ref. Fig. 404/TASK 21-51-51-991-009) R **ON A/C 106-149, 303-399, 401-499,
(1)
Disconnect the electrical connectors (2), (3) and (4).
(2)
Put blanking caps on the disconnected electrical connectors.
(3)
Remove the nut (23), the washer (24), the screw (18) and disconnect the bonding strap (25).
(4)
Remove the clamp (16).
(5)
Move the flange (13) and the sleeve (14) as far to the heat exchanger unit as they will go.
(6)
Hold the pack flow-control unit (17) and remove the nuts (22), the washers (21), the bolts (19) and the spacers (20).
(7)
Carefully remove the pack flow-control unit (17) from the aircraft.
(8)
Remove the flange (13) together with the sleeve (14) from the heat exchanger unit connecting-end (15).
(9)
Remove the flange (13) from the sleeve (14).
(10)
Remove and discard the seals (31(131)) from the sleeve (14).
(11)
Put protective covers on the open ends of the pack flow-control unit
(17) and the heat exchanger unit connecting-end (15).
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B. Removal of the Attachment Fitting
(Ref. Fig. 402/TASK 21-51-51-991-003)
(1)
Remove the nuts (3), the washers (4), the bolts (5), the bushings (6) and the fitting (1).
(2)
Do the inspection of the components for in-service wear (Ref. TASK 21-51-51-200-001).
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Attachment Components - Air Duct
Figure 403B/TASK 21-51-51-991-006-A13 (SHEET 1)
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Attachment Components - Air Duct
Figure 403B/TASK 21-51-51-991-006-A23 (SHEET 2)
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Attachment Components - Air Duct
Figure 403B/TASK 21-51-51-991-006-A33 (SHEET 3)
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INTENTIONALLY BLANK
R 1 1
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Pack Flow-Control System - Component Location
Figure 404/TASK 21-51-51-991-009- 13 (SHEET 1)
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Pack Flow-Control System - Component Location
Figure 404/TASK 21-51-51-991-009- 23 (SHEET 2)
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Pack Flow-Control System - Component Location
Figure 404/TASK 21-51-51-991-009- 33 (SHEET 3)
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TASK 21-51-51-400-001-A Installation of the Pack Flow-Control Unit
1. Reason for the Job
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