B.  
Access

 (1)  
Location Zones
 221/222 Passenger cabin - section 41
 231/232 Passenger cabin - section 43
 241/242 Passenger cabin - section 44
 251/252 Passenger cabin - section 46

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A
757
MAINTENANCE MANUAL

CARPET RISER PANEL AND AIR GRILLE A-A Return Air Grilles Installation Figure 201
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757 MAINTENANCE MANUAL
 C.  Clean the return air grills.
 S 022-128
 (1)  
Remove the return air grill.

 S 162-129

 (2)  
Use the vacuum cleaner to remove the dust, lint, and other unwanted material from the grill.

 S 162-130

 (3)  
Use the vacuum cleaner to remove the dust, lint, or unwanted material from the airplane structure behind the return air grill.

 S 422-131

 (4)  
Install the return air grill.

 TASK 21-23-05-402-030
 4.  Install the Return Air Grills (Fig. 201)_____________________________
 A.  References
 (1)  
AMM 25-25-01/201, Passenger Seats

 B.  
Access

 (1)  
Location Zones
 221/222 Passenger cabin - section 41
 231/232 Passenger cabin - section 43
 241/242 Passenger cabin - section 44
 251/252 Passenger cabin - section 46

 C.  
Install the Return Air Grills

 S 422-051
 (1)  
Do the steps that follow:

 (a)  
Install the return air grill into the carpet riser. 1) Attach the clip, on the top of the return air grill, onto the carpet riser.

 2)  Install two clips and screws into the back of the carpet riser, on the bottom of the grill.

 (b)  
Install the carpet riser. 1) Push the top of the the carpet riser into the sidewall clip as far as possible. 2) Push the bottom of the carpet riser outboard, against the sidewall frame.

 3)  Push the carpet riser down, so that the carpet riser clip attaches to the crease beam.
 S 412-052
 (2) If applicable, install the passenger seats (AMM 25-25-01/201).
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757 MAINTENANCE MANUAL
 SIDEWALL RISER DUCT - REMOVAL/INSTALLATION
__________________________________________
 1.  General_______
 A.  Four riser ducts, two on each side of the airplane, are installed in the sidewalls of the passenger compartment. The forward riser ducts are between the fifth and sixth windows aft of the No. 2 passenger door. The aft riser ducts are between the sixth and seventh windows aft of the No. 2 passenger door.
 B.  This procedure has instruction to remove and install the sidewall riser ducts.
 TASK 21-23-06-004-001
 2.  Remove the Sidewall Riser Duct (Fig. 401)______________________________
 A.  References
 (1)  
06-46-00/201, Entry, Service, and Cargo Doors Access Doors and Panels

 (2)  
21-23-02/401, Air Conditioning System Outlets

 (3)  
25-21-02/401, Sidewall Lining

 (4)  
25-25-01/201, Passenger Seats

 (5)  
25-28-02/401, Overhead Stowage Bin

 B.  
Access

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