C.  
Prepare for the Removal

 S 014-002
 (1)  
Remove the passenger seats (AMM 25-25-01/201) between the fourth and twelfth windows aft of the No. 2 passenger door, 832 or 842 (AMM 06-46-00/201).

 S 014-003

 (2)  
Remove the sidewall linings (AMM 25-21-02/401) between the fourth and twelfth windows aft of the No. 2 passenger door, 832 or 842 (AMM 06-46-00/201).

 S 014-005

 (3)  
Remove the overhead stowage bins that are necessary to get access to the riser duct (AMM 25-28-02/401).

 S 014-006

 (4)  
Remove the support clips for the wire bundles that are attached to the support brackets on the riser ducts.

 S 014-007

 (5)  
Remove the outlets that are necessary to get access to the riser duct (Ref 21-23-02).

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MAINTENANCE MANUAL

JOINT COVER

Air Conditioning Sidewall Riser Duct Installation
Figure 401

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MAINTENANCE MANUAL

 S 014-008
 (6)  
Remove the section of the air outlet extrusion that is necessary to get access to the riser duct.

 (a)  
Remove the bolts, washers, and nuts at the joints of the air outlet extrusion.

 (b)  
Remove the screws that hold the air outlet extrusion in position.

 (c)  
Remove the air outlet extrusion.

 S 014-009
 (7)  
Loosen the retainers that hold the insulation blanket around the riser duct.

 S 014-010

 (8)  
Remove the insulation.

 D.
Remove the Riser Duct

 S 034-011
 (1)  
Remove the screws from the lower joint of the riser duct, which is immediately above the floor.

 S 034-012

 (2)  
Remove the screws from the top joint of the riser duct, which is immediately below the control cables.

 (a)  
Do not remove the cover, which is attached to the riser duct.

 S 034-013
 (3)  
Remove the screws that hold the riser duct to the support brackets.

 S 034-014

 (4)  
Disconnect the riser duct at the top and lower duct joints.

 (a)  
Break the adhesive seals at the joints.

 (b)  
Lift the riser duct to loosen the lower joint.

 (c)  
Pull the lower part of the riser duct inboard and lower it near to the duct below it.

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757 MAINTENANCE MANUAL
 (d)  Move the cover of the joint off of the overhead duct.
 S 024-015
 (5)  
Lift the riser duct up and out of the sidewall.

 S 434-017

 (6)  
Put a cover on the duct openings.

 TASK 21-23-06-404-016
 3.  Install the Sidewall Riser Duct (Fig. 401)_______________________________
 A. Consumable Materials
 (1)  
B00148 Solvent - Methyl Ethyl Ketone (MEK), TT-M-261

 (2)  
A00027 - Adhesive - BAC 5010

 B.
References

 (1)  
21-23-02/401, Air Conditioning System Outlets

 (2)  
24-22-00/201, Electrical Power - Control

 (3)  
25-21-02/401, Sidewall Lining

 (4)  
25-25-01/201, Passenger Seats

 (5)  
　
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