(2)  
PPG and Sierracin No. 1 windows have a stainless steel Z-channel strip mounted between a rubber cushion and the beaded pressure seal around the periphery of the outer glass pane. PPG No. 1 windows have a silicone bumper strip around the periphery of the outer glass pane covered by a PR 1422 sealant cushion and then the Z-channel. On Sierracin No. 1 windows the cushion is PR 1422 sealant. Triplex No. 1 windows have a PR 1425 rubber bumper strip around the periphery of the outer glass pane.

(3)  
On control cabin windows number 1, 4 and 5, fairing compound is applied to the window frame structure to accommodate the smal1 irregularities in the frame surface and to ensure that a perfectly flat surface is presented to the windowpane.

(4)  
An aerodynamic smoother is installed on each of the fixed windows, in the gap between the window frame and the edge of the outer pane or bumper strip. The smoother provides aerodynamic flushness and protection against water entrapment. A nylon cord, or nylon thread, is installed under the aerodynamic smoother to facilitate its removal when required.

500 
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H26805
500  Fixed Control Cabin Window Details 
May 15/67  Figure 1 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  56-11-0 Page 3 

Fixed Control Cabin Window Seal Details  500 
56-11-0Page 4   Figure 2 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 20/90 

CONTROL CABIN WINDOWS - MAINTENANCE PRACITICE
1.  General
A.  No. 3 window made of stretched acrylic plastic are to be cleaned and waxed per the
procedures in par. 2 and 3. (For No. 1, 4 and 5 windows, and No. 3 glass window
Ref 12-40-0 MP).

B.  The optical qualities of any window are of prime importance. Any window whose condition impairs visibility must be replaced no matter how well it might meet the requirements of par. 4.
NOTE:  Paragraph No. 4 describes damage criteria for windows with glass panes. (For damage criteria for window No. 3, refer to Window No. 3 - Inspection/Check, 56-11-21.)
2.  No. 3 Window Cleaning
A.  Equipment and Materials
(1)  
Cloth or sponge, soft, clean, and oil-free

(2)  
Chamois, Clean and Oil-Free KK-C-300 (Ref 20-30-51)

(3)  
Canton (cotton) flannel, clean and oil-free, any source

(4)  
Soap, Orvus WA paste (Ref 20-30-31)

(5)  
Aliphatic Naphtha - TT-N-95 (Ref 20-30-31)

B.  Clean No. 3 Window
(1)  
Remove loosely adhering dirt and grit from window exterior by flushing with water filtered free of dirt and abrasive materials.

(2)  
Wipe exterior with a soft, damp cloth or sponge. Keep cloth or sponge free of abrasive materials by rinsing it frequently in clean water.

(3)  
Wash both sides with nonabrasive soap and water. Use a soft, thoroughly clean cloth, sponge, or chamois for washing, if required, but only as a means of carrying the soapy water to the plastic. Go over surface only with bare hand so that any abrasive can be quickly detected and removed before it scratches the plastic surface.

NOTE:  All rubbing operations on acrylic plastics must be done with as light a pressure as possible.

(4)  
Dry window surfaces with a clean, damp chamois. A clean, cotton-flannel cloth may be used if care is taken not to rub plastic after surface is dry.

CAUTION:  DO NOT RUB DRY PLASTIC WITH A DRY CLOTH. THIS WILL CAUSE SCRATCHES AND BUILD UP AN ELECTROSTATIC CHARGE WHICH ATTRACTS DUST PARTICLES.

(5)  
Remove oil and grease by rubbing lightly with a cloth wetted with aliphatic naphtha. Dry with a clean, cotton-flannel cloth.

CAUTION:  DO NOT USE THE FOLLOWING MATERIALS ON ACRYLIC PLASTICS: GASOLINE, ALCOHOL, BENZINE, HEZANE, ZYLENE, ACETONE, CARBON TETRACHLORIDE, FIRE EXTINGUISHER FLUIDS, DEICING FLUIDS CONTAINING ISOPROPYL ALCOHOL, LACQUER THINNERS, OR WINDOW CLEANING SPRAYS BECAUSE THEY SOFTEN THE PLASTIC AND/OR CAUSE CRAZING.
500 
Feb 20/87  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  56-11-0 Page 201 

3.  No. 3 Window Waxing
A.  Equipment and Materials
(1)  
Static stop cleaner wax (Ref 20-30-31)

(2)  
DuPont No. 7 Auto Polish and Cleaner (Ref 20-30-31)

(3)  
Maguires Mirroglaze, Mirror Bright Polish Co., Irvine, California

(4)  
Canton (cotton) flannel

B.  Wax No. 3 Window
(1)  
Thoroughly agitate wax to ensure a homogeneous mixture.
　
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