4. Procedure
_________
 **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,

 (Ref. Fig. 401/TASK 21-28-52-991-001) R **ON A/C 151-199, 401-499,
 (Ref. Fig. 401A/TASK 21-28-52-991-001-A)
 **ON A/C ALL

 Subtask 21-28-52-420-050
 A. Installation of the Isolation Valve
 (1) FOR 34HN
 (a)
 Remove the blanking plugs from the isolation valve (11), the sleeve (1), and the duct flange (2).

 (b)
 Clean the component interface and/or the adjacent area.

 (c)
 Make sure that the parts retained from the removed component are clean and in the correct condition.

 (d)
 Put the isolation valve (11) in position and engage the pin (4) in the cutout in the duct flange (2).

 (e)
 Install the clamp (3).

 (f)
 TORQUE the clamp (3) to between 0.51 and 0.56 m.daN (45.13 and

 49.55 lbf.in).

 (g)
 Put the clamp (12) and the sleeve (1) in position on the isolation valve (11).

 NOTE : The end of the sleeve (1) must be within the coloured
____ markings on the isolation valve (11).
 (h)
 Tighten the clamp (12).

 (i)
 Put the bonding strap (9) in position and install the washer (8), the screw (7), the washer (6) and the nut (5) (Ref. TASK 20-28-00-912-004).

 (j)
 Remove the blanking caps from the disconnected electrical
 connectors.

 (k)
 Make sure that the electrical connectors are clean and in the correct condition.

 (l)
 Connect the electrical connector (10).

 (2) FOR 33HN
 (a)
 Remove the blanking plugs from the isolation valve (24), the sleeve (15) and the duct flange (13).

 (b)
 Clean the component interface and/or the adjacent area.

 (c)
 Make sure that the parts retained from the removed component are clean and in the correct condition.

 (d)
 Put the isolation valve (24) in position and engage the pin (26) in the cutout in the duct flange (15).

 (e)
 Put the clamp (25) in position on the isolation valve (24) and the duct flange (13).

 NOTE : Do not fully tighten the clamp (25) at this time.
____
 (f) Put the clamp (17) in position on the bracket (14) and the isolation valve (24).
 NOTE : Do not fully tighten the clamp (17) at this time.
____
 (g)
 Make sure that the clamp (25) is in the correct position.

 (h)
 TORQUE the clamp (25) to between 0.51 and 0.56 m.daN (45.13 and

 49.55 lbf.in).
 NOTE : When you look in the direction of the air flow the attach

____ device of the clamp (25) must be between the 7 o'clock and the 8 o'clock position.
 (i) Tighten the clamp (17).
 1EFF : ALL 1 21-28-52Page 415 1 1 Aug 01/05R 1 1 1CES 1

 (j) Put the clamp (16) and the sleeve (15) in position on the isolation valve (24).
 NOTE : The end of the sleeve (15) must be within the coloured
____ markings on the isolation valve (24).
 (k)
 Tighten the clamp (16).

 (l)
 Put the bonding strap (21) in position and install the washer (20), the screw (19), the washer (22) and the nut (23) (Ref. TASK 20-28-00-912-004).

 (m)
 Remove the blanking caps from the disconnected electrical connectors.

 (n)
 Make sure that the electrical connectors are clean and in the correct condition.

 (o) Connect the electrical connector (18). Subtask 21-28-52-865-052
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 30HN, 31HN.
 Subtask 21-28-52-710-050
 C. Do the operational test of the AFT cargo-compartment ventilation system (Ref. TASK 21-28-00-710-006).
 5. Close-up
________ **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
 Subtask 21-28-52-410-050
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Install the access panel:

 (a) FOR 33HN
 -162DW (Ref. TASK 25-55-12-400-001).
 1EFF : ALL 1 21-28-52Page 416 1 1 Aug 01/05R 1 1 1CES 1

 (b) FOR 34HN
 -151EW (Ref. TASK 25-55-11-400-003).
 (3)
 Remove the access platform(s).

 (4)
 Close the AFT cargo-compartment door 826 (Ref. TASK 52-30-00-860-002).

 (5) Remove the warning notice(s). R **ON A/C 151-199, 401-499,
　
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