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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(2) Inner and outer pane damage/repair limits are presented below. Panes cannot be reduced below these thicknesses under any circumstances.
CONTROL CABIN WINDOW NO. 3 MINIMUM THICKNESS
Inner Pane *[1] 0.220 inch
Outer Pane 0.380 inch
*[1] Ref Component Maintenance Manual for Repairs
(3)
Crazing:
(a)
Crazing in inner stretched acrylic pane.
(b)
Surface crazing in the outer stretched acrylic pane, other than at the routed edge, if following limits are exceeded:
(4)
Chipping:
(a)
Chipping of the outer stretched acrylic pane when following limits are exceeded:
(b)
Any chip on the surface of the inner stretched acrylic pane and chips along edge that exceed 0.06 inch in depth. Edge chips and delaminations may be removed by chamfering edge of pane (Ref Overhaul Manual).
(5)
Delaminations (In-plane cracking):
MAX DEPTH (IN.) MAX LOCAL AREA
0.050 2.0 inch dia
0.030 Over entire surface
MAX CHIP MAX SIZE OF MIN DISTANCE
DEPTH DELAMINATION BETWEEN SHIPS
(INCH) DUE TO CHIP (INCHES)
0.05 0.50 DIA 1.00
500
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(a) Delaminations if visibility is impaired or if the following limits are exceeded:
4. Window No. 3 Check
A. Check for loose or missing fasteners in window frame.
CAUTION: TO REDUCE POSSIBILITY OF WINDOW BREAKING, LOOSE OR REPLACEMENT BOLTS SHOULD NOT BE TIGHTENED MORE THAN THE SPECIFIED TORQUE (REF REMOVAL/INSTALLATION).
A92286
500
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500 No. 3 Window Urethane Layer Crack Identification
Jun 20/91 Figure 603 56-11-21
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
WINDOW NO. 3 – APPROVED REPAIRS
1. Repair Window No. 3
A. General
(1)
Scratches and surface crazing in the No. 3 windows may be removed by sanding, polishing, or buffing. Outer panes must not be reduced in thickness below 0.38 inch under any circumstances. Repairs to inner pane should be made per Overhaul Manual.
(2)
Scratches are divided into three types: superficial, minor, and major. Superficial scratches are those which may be caused by careless removal of traffic film or by rubbing dry cheesecloth over the pane; depth is under 0.001 inch. Minor scratches do not have a buildup on the sides and are from 0.001 to 0.004 inch in depth. Major scratches are over
0.004 inch in depth and usually have a buildup on both sides of crevice.
(3)
Crazing appears on the window outer surface and takes the form of many tiny cracks which reflect and disperse light. It causes a sparkling appearance which results in loss of optical quality. Crazing becomes evident at a depth of 0.001 inch and optical impairment occurs at a depth of 0.004 inch. Crazing may center at minor scratch sites and can obscure detection of cracks. Cracks become structurally critical at a depth of 0.050 inch.
(4)
Use care when handling window panes to avoid additional damage.
(a)
Cover unscratched areas with protective coating or tape.
(b)
Handle polished panes only when wearing clean cotton gloves.
(c)
Do not use unapproved materials
(d)
Take care not to scratch the window surface with finger rings or other sharp objects.
500
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B. Equipment and Materials
(1)
Protective Coating, Spraylot SC-1071 (Ref 20-30-51)
(2)
Protective Tape, Gizard Protex 20V (Ref 20-30-51)
(3)
Speed Tape, 3M# Y9162A (Ref 20-30-51)
(4)
Canton (Cotton) Flannel Cloth, Clean and Oil-Free, Any Source
(5)
Chamois, KK-C-300 (Ref 20-30-51)
(6)
Sander, Vibrating, Air-Driven with rubber band
(7)
Sanding Block: Rubber Block, Shore "A" Durometer Hardness; or Wood Block With Several Layers of Flannel
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