-
the FWD cargo-compartment door 825 is open (Ref. TASK 52-30-00-860-001),

 -
the access panels are removed as necessary (Ref. TASK 25-54-12-000-001), (Ref. TASK 25-54-12-000-002) or (Ref. TASK 25-54-12-000-003).

 (e)
 For the cabin area supply ducts in the MID cabin and the wing box area:

 -the cabin floor panels are removed as necessary (Ref. TASK 53-32-12-000-002).

 (f)
 For the cabin area supply and the cargo-compartment ventilation ducts in the AFT cargo compartment:

 -
the access platform is in position at the AFT cargo-compartment door 826,

 -
the AFT cargo-compartment door 826 is open (Ref. TASK 52-30-00-860-001),

 -
the access panels are removed as necessary (Ref. TASK 25-55-11-000-001), (Ref. TASK 25-55-11-000-002), (Ref. TASK 25-55-11-000-003), (Ref. TASK 25-55-12-000-001), (Ref. TASK 25-55-12-000-002) or (Ref. TASK 25-55-12-000-003).

 (g)
 For the riser ducts in the cabin area:

 1_ The APU BLEED pushbutton switch is in the off position (the ON
 legend is off).
 2_ The ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in
 the off position (the OFF legends are on).
 3_ The warning notice to tell persons not to operate these
 pushbutton switches is in position.

 -the upper and the lower sidewall panels are removed as necessary (Ref. TASK 25-23-44-000-001) and (Ref. TASK 25-23-43-000-001).
 Subtask 21-20-00-865-051
 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------122VU AIR COND/RECIRC FAN/R/SPLY 3HG W18 122VU AIR COND/RECIRC FAN/L/SPLY 1HG X18
 4. Procedure
_________
 Subtask 21-20-00-560-050
 A. Preparation of the Replacement Air-Conditioning Distribution Duct
 (1) Where applicable remove the attached components, for example drain hose, blanking caps, restrictors etc. from the removed duct.
 NOTE : Identify the respective positions of the restrictors on the
____ removed duct. The restrictors must be installed in the identical positions on the replacement duct. The position of the restrictors is not usually interchangeable.
 (2) Install the removed components in their correct respective positions on the replacement duct.

 Subtask 21-20-00-420-050
 B. Installation of an Air-Conditioning Distribution Duct
 (1)
 Remove the protective covers from the ends of the ducts and the related connections.

 (2)
 Where applicable make sure that:
 (Ref. Fig. 202/TASK 21-20-00-991-002)

 (a)
 The blanking caps (7) and the clamps (2) are correctly installed.

 (b)
 The restrictors (9) are correctly installed in the duct (1). NOTE : The restrictors (9) must be installed in the original

____ position in the duct. The position of the restrictors is not usually interchangeable.
 (Ref. Fig. 203/TASK 21-20-00-991-003)
 (3) Put the duct (1) in position and, applicable upon duct attachment method:
 (a)
 Install the washers (21) and the screws (20) or,

 (b)
 Put the clamps (25) in position and install the washers (21) and the screws (20) or,

 (c)
 Put the clamps (22) in position on the brackets (23),

 -make sure that the clamps (22) are correctly installed on the brackets (23),
 -tighten the clamps (22).
 NOTE : On oval shaped ducts make sure that the clamp lock is in

____ the correct position on the duct ellipse. On the cabin riser ducts make sure that, where possible, the clamp lock is positioned on the outboard side of the duct. This will help to give sufficient clearance when you install the sidewall panels.
 (4) Applicable upon the type of duct connection,
 (Ref. Fig. 202/TASK 21-20-00-991-002)

 NOTE : On oval shaped ducts make sure that the clamp lock is in the
____
 correct position on the duct ellipse.

 On duct end connections with one coloured marking you must make sure that the ends of the bellows, sleeve or hose cover the coloured markings. On duct end connections with two coloured markings you must make sure that the ends of the bellows, sleeve or hose are within the coloured markings. On the cabin riser ducts make sure that, where possible, the clamp lock is positioned on the outboard side of the duct. This will help to give sufficient clearance when you install the sidewall panels.
　
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