(7)
Examine windows for concavity.
(a)
Concavity is out of contour window panes. The outer (stretched acrylic) pane bows inward and the middle (cast acrylic) pane bows outward. A deformed window is of no structural concern even if the middle and outer panes touch when the airplane is unpressurized. 1) Place straightedge across narrow width of outboard surface of outer plane. If
gap exists between straightedge and center of pane, window is concave. Windows prone to fogging are prone to uniform concavity.
(b)
Deformed windows can be returned close to their original contour by removing them from the airplane and drying them out.
(8)
Examine windows for optical distortion.
(a) Replace windows with extreme localized optical distortion, or thickness variations.
(9)
Examine windows for leakage into cavity between middle and outer panes.
(a)
Some signs of a leaking seal are: 1) Fogging and concavity. 2) Brown stains, outside in vicinity of seal or inside near vent hole in middle pane. 3) Obvious displaced, rolled back, or damaged seals.
(b)
Replace leaking seals.
(10)
Examine windowpanes for creep deformation.
(a)
Creep deformation is middle pane damage created by window retainer clip against the edge of pane (Fig. 601).
(b)
Middle pane creep deformation is permissible within the following limits: 1) Without discrete surface discontinuity, surface or edge is slightly displaced, but a fingernail cannot detect a discontinuity. No rework is necessary. 2) Discrete discontinuity, but no evidence of a vee notch crack. Window should be reworked (Ref Approved Repairs). 3) Discrete surface discontinuity and a vee notch crack less than 0.05 inch inward from edge of pane. Window should be reworked.
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NOTE: Uneven surface contour and reduced optical quality can be caused by exposure to high temperature, such as photo flood lamp.
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4) Discrete surface discontinuity and a vee notch crack greater than 0.05 inch inward from edge of pane. Window should be replaced.
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PASSENGER CABIN WINDOWS - APPROVED REPAIRS
1. General
A. This section contains repairs to be accomplished with windows installed in the airplane. For window repairs to be accomplished on the bench (including repairs to the bevel edge and the seal plane), refer to Component Maintenance Manual 56-21-31 or 56-21-51.
B. Chips or scratches in the passenger compartment windows are removed by sanding, polishing, or buffing. Damage criteria and limits are established in Passenger Windows - I/C.
C. Use clean cotton gloves when handling windowpanes to avoid additional damage.
D. Use only approved materials.
E. Take care not to scratch the window surface with finger rings or other sharp objects.
2. Equipment
A. Optical Micrometer - Model 966A1
Edwards Aerospace Company
1841 Business Pkwy
Ontario, CA 91761
Telephone (714) 923-3533
Fax (714) 923-6781
B. Sander, Vibrating - Air Driven (with rubber pad) (Commercially Available)
C. Sanding Block - Rubber Block of Shore-A Scale Durometer 35 Hardness (Optional: Wood Block with Several Layers of Flannel) (Commercially Available)
3. Materials
A. Protective Coating - Spraylat SC-1071 (Ref 20-30-51)
B. Aluminum Foil Tape - Permacel P112 (Ref 20-30-51)
C. Protective Tape - Gizard Protex 20V (Ref 20-30-51)
D. Canton (cotton) flannel cloth, clean and oil free, any source
E. Chamois - KK-C-300 (Ref 20-30-51)
F. Buffing Compound - Learock No. 888 (Ref 20-30-31)
G. Buffing Compound - Learock No. S-30 (Ref 20-30-31)
H. Dustless Acrylic Window Cleaner (Ref 20-30-31)
I. Plex-I-Glow Cleaner and Polish (Ref 20-30-31)
J. Wet-or-Dry Sandpaper No. 600-A to 100-A
K. Micromesh Cloths 1600 thru 8000 grit - Kit SN2 (Ref 20-30-51)
L. Mirror Glaze Polish, MGH-10 (Ref 20-30-31)
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M. Mirror Glaze Polish, MGH-17 (Ref 20-30-31)
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