D.
Install the restrictor plate

 S 114-017
 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.
 (1)  
Use isopropyl alcohol or ethyl alcohol to clean the mating surfaces of the overhead distribution duct and the adapter.

 S 114-018

 (2)  
Use isopropyl alcohol or ethyl alcohol to clean the surfaces of the joint cover.

 S 424-008

 (3)  
Put the restrictor plate in its position immediately below the overhead air distribution duct.

 (a)  
If it is necessary, trim the restrictor plate to make sure there is not a gap at the ends of the restrictor plate.

 S 434-009
 (4)  
Put the adapter in its position immediately below the restrictor plate.

 (a)  
Install the screws to hold the adapter to the overhead distribtion duct.

 (b)  
Put the adhesive side of the seal against the joint cover.

 (c)  
Put the joint cover in its position against the adapter.

 (d)  
Install the screws to hold the joint cover to the adapter.

 S 434-016
 (5)  
Install the overhead nozzle assembly.

 (a)  
Put the nozzle assembly in its position immediately below the adapter.

 (b)  
Install the screws to hold the nozzle assembly to the adapter.

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757 MAINTENANCE MANUAL
 (6)  S 394-019Apply the adhesive or the tape along the entire edge of the adapter and the overhead distribution duct.
 (7)  S 114-020Apply the adhesive over all the gaps and voids to make sure ther are no leaks in the adapter.
 (8)  S 414-012Install the sculptured ceiling panel (AMM 25-22-01/401).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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757
MAINTENANCE MANUAL

 RETURN AIR GRILLS - MAINTENANCE PRACTICES
_________________________________________
 1.  General
_______
 A.  This procedure has instructions to do the tasks that follow:
 (1)  
Remove the Return Air Grills

 (2)  
Install the Return Air Grills

 (3)  
Clean the Return Air Grills

 TASK 21-23-05-002-001
 2.  Remove 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.  
Remove the Return Air Grills

 S 012-002
 (1)  
If necessary, remove the passenger seats (AMM 25-25-01/201) to get access to the grills.

 S 032-027

 (2)  
Do the steps that follow:

 (a)  
Remove the carpet riser that has the return air grill. 1) Push the carpet riser up into the sidewall clip until the bottom carpet riser clip is above the crease beam. 2) Pull the bottom of the carpet riser inboard over the crease beam.

 3)  Pull the carpet riser down until it comes out of the sidewall clip.

 (b)  
Remove the screws in back of the carpet riser.

 S 022-028
 (3)  Remove the return air grill.
 TASK 21-23-05-102-127
 3.  Clean the Return Air Grills (Fig. 201)
___________________________
 A.  Equipment
 (1)  
Vacuum Cleaner - commercially available
　
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