(2)  
Before using any cleaning material not listed below submit the proposed material to a Polycarbonate Crazing Test (Ref Overhaul Manual, Chapter 20-30-03).

B.  Equipment and Materials (Ref 20-30-31)
(1)  
Cleaning detergent, any of the following:

(a)  
High Concentrate 40.1 (Mix 1 part cleaner to 32 parts water).

(b)  
Spraywhite E (Mix 1 part cleaner to 10 parts water).

(c)  
Clean Quick (Mix 1 part cleaner to 64 parts water).

(d)  
Orvus W.A. Paste (Mix 1 part cleaner to 30 parts water).

(e)  
Glo Do-All Formula 3B (Mix 1 part cleaner to 30 parts water).

(f)  
Glo Do-All Formula 1B (Mix 1 part cleaner to 20 parts water).

(2)  
Clean, dry cloths or absorbent paper toweling

(3)  
Plastic spray bottle or sponge

C.  Clean Window Reveals
(1)  
Apply one of detergent solutions listed in par. B by spray or by sponge dampened in solution.

CAUTION:  SOME SURFACES MAY BE DAMAGED (CRACKED) BEYOND REPAIR BY USING IMPROPER CLEANING MATERIALS.

(2)  
Allow detergent solution to remain on surface approximately 2 minutes then wipe with damp cloth.

(3)  
Rinse surface with a clean cloth saturated with clean water.

(4)  
Wipe dry with clean, dry cloth.

501 
Nov 15/78  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  25-21-314 Page 701 

AIR RETURN GRILLE - REMOVAL/INSTALLATION
EFFECTIVITY
Wide-Body Look and Carry-All Compartment Interior
1. Remove Air Return Grille
A.  On Passenger/Cargo Convertible Airplanes if an air grille containing a pallet power outlet is to be removed, open the CARGO PALLET OUTLETS circuit breaker on panel P6.
D.  At each end of air grille rotate quick-release fastener 90 degrees to unlock (Fig. 401).
C.  Pull air grille inboard to remove.
D.  On Passenger/Cargo Convertible Airplanes, if electrical outlet is installed in air grille, remove four screws attaching outlet to outboard side of air grille.
2.  Install Air Return Grille
A.  On Passenger/Cargo Convertible Airplanes, if air grille is to be installed in area of a pallet power outlet, attach outlet to outboard side of air grille with four screws.
D.  Position air grille in opening in carpet riser panel with edges overlapping the sidewall carpeting (Fig. 401).
C.  At each end of air grille rotate quick-release fastener 90 degrees to lock.
D.  On Passenger/Cargo Convertible Airplanes, close CARGO PALLET OUTLETS circuit breaker on panel P6.
Aug 15/78 25-21-315 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

Sidewall Air Return Grille Installation  518 
25-21-315 Page 402  Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 15/78 

CARPET RISER PANEL - REMOVAL/INSTALLATION
EFFECTIVITY
Wide-Body Look or Carry-All Compartment Interiors
1. Remove Carpet Riser Panel
A.  Remove air return grilles from the section of sidewall carpet that covers the carpet riser panel to be removed (Ref 25-21-315).
NOTE:  The sidewall carpet is installed in lengths which may span up to three carpet riser panels. Therefore, it is necessary to remove air return grilles from the carpet riser panels covered by that carpet section to allow removal of the carpet.
B.  If installed in carpet riser to be removed, unscrew smoke detector sensor inlet washer.
C.  Pull sidewall carpet section away from tape securing it to carpet riser panels.
D.  Loosen screws securing adjustable top edge of carpet riser panel and slide top edge down to clear window panel (Fig. 401).
E.  Rotate two quick-release fasteners on carpet riser panel 90 degrees to unlock. Also unlock fasteners on adjacent overlapping carpet riser panel.
F.  Pull inboard on end of panel containing quick-release fasteners, slide opposite end out from under adjacent carpet riser panel, and remove panel.
2.  Install Carpet Riser Panel
A.  Slide end of carpet riser panel that does not contain fasteners under adjacent panel and engage angle on outboard side with fire stop panel in sidewall (Fig. 401).
B.  Lock quick-release fasteners on carpet riser panel and adjacent panel by rotating 90 degrees.
C.  Push up adjustable top edge of carpet riser panel to engage all three tabs on window panel and tighten screws to secure top edge.
D.  Install sidewall carpet section on carpet riser panels by pressing against double-surface tape.
E.  If installed in riser panel being installed, screw smoke detector inlet washer into smoke detector fitting behind riser panel.
　
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