C.
Access

 (1)  
Location Zones
 233/234 Passenger cabin - section 43
 243/244 Passenger cabin - section 44

 D.
Install the Riser Duct

 S 034-018
 (1)  
Remove the covers from the duct openings.

 S 424-019

 (2)  
Put the riser duct into the sidewall, outboard of the wire bundles.

 S 434-020

 (3)  
Connect the riser duct, at the top and lower duct joints, to the adjacent ducts.

 WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON
_______ YOUR SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
 (a)  Use solvent, Series 91 (AMM 20-30-91), to clean the mating surfaces of the top and lower duct joints.
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MAINTENANCE MANUAL

 (b)  
Apply the adhesive to the mating surface of the lower joint.

 (c)  
Put the riser duct into position above the lower joint.

 (d)  
Move the cover for the top joint on to the overhead duct.

 (e)  
Install the screws for the lower joint.

 (f)  
Apply a continuous bead of the adhesive to the edge of the cover of the top joint.

 (g)  
Install the screws for the cover of the top joint.

 S 034-021
 (4)  
Install the screws that hold the riser duct to the support brackets.

 S 864-022

 (5)  
Let the adhesive cure for at least 24 hours at 65 to 100°F (18-38°C) and a minimum of 20 percent relative humidity.

 E.
Do the Riser Duct Installation Test

 S 864-023
 (1)  
Supply electrical power (Ref 24-22-00).

 S 864-024

 (2)  
Push the L and R RECIRC FAN switch-lights, on the P5 panel, to the on position.

 (a)  
Make sure the ON lights come on and the INOP lights go off.

 S 214-026
 (3)  
Feel for air leaks at the duct joints.

 (a)  
Small leaks are permitted.

 (b)  
You must repair the large leaks.

 F.
Put the airplane back to its usual condition.

 (1)  
Install the insulation along the riser duct.

 S 414-028

 (2)
Install the section of the air outlet extrusion that was removed.

 (a)  
Put the section of the air outlet extrusion into position.

 S 414-027
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757 MAINTENANCE MANUAL
 (b) (c)  Install the screws that hold the air outlet extrusion in position.Install the bolts, washers, and nuts at the joints of the air outlet extrusion.
 (3)  S 414-029Install the support clips for the wire bundles to the support brackets.
 (4)  S 414-030Install the sidewall lining (AMM 25-21-02/401).
 (5)  S 414-031Install the overhead stowage bins (AMM 25-28-02/401).
 (6)  S 414-032Install the passenger seats (AMM 25-25-01/201).
 (7)  S 864-033Remove the electrical power, if it is not necessary (Ref 24-22-00).

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 INDIVIDUAL (GASPER) AIR DISTRIBUTION SYSTEM - DESCRIPTION AND OPERATION
　
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