(2)
Grasp protective cover at least 2 inches in from edge and pull toward center. When released, seal should adhere to outer surface of outer pane and remain snuggly in place.
(3)
Repeat above procedure until seal edge is in place as viewed from inside airplane.
(4)
On airplanes without return flanged clips, tighten screws using criss-cross torque sequence. A suggested tightening sequence is shown in Fig. 401. Tighten until threads show past nut, and washer and head sits flat on clip.
(5)
On airplanes with return flanged clips (preferred), tighten screws using criss-cross torque sequence. A suggested tightening sequence is shown in Fig. 401. Tighten screws 12-15 pound-inches.
NOTE: If bulging occurs reduce torque as required. If clip is loose and not seated at 15 pound-inches torque, torque may be increased 5 pound-inches as required to seat clip. Maximum torque should not exceed 25 pound-inches.
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502 Passenger Cabin Window Installation
Feb 20/81 Figure 401 56-21-0
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C. Remove protective cover from inner surface of middle pane (7).
D. Clean and apply antistatic agent to inner surface of middle pane (7) (Ref Servicing, Passenger Cabin Windows).
7. Restore Airplane to Normal
A. Clean sidewall lining (Ref 12-40-0).
B. Install sidewall lining (Ref 25-21).
NOTE: Use care in handling plastic reveal. Surfaces visible to cabin interior must be free of marks, scratches, and dents.
C. Remove window pane seal protective cover by tearing along notch line and tear off seal cover. Start tear by cutting notch. If seal cover does not tear smoothly at notch line, it may be necessary to score notch thickness 25 to 75% all around before tearing.
CAUTION: EXTREME CARE MUST BE TAKEN DURING CUTTING OF NOTCH TO PREVENT SCRATCHING WINDOW OR CUTTING THROUGH BEADS ON EITHER SIDE OF NOTCH. DO NOT CUT THROUGH.
D. Clean outer surface of outer pane (3) with luke warm water and castile soap. Use a soft, clean cloth to transfer the soap solution to the pane surface. Go over the surface with the bare hand only, so that any dirt can be quickly detected and removed before it scratches the surface.
CAUTION: COMBINATION OF PROLONGED SOAP SOLUTION CONTACT AND PROLONGED EXPOSURE TO SUNLIGHT CAN CAUSE THE WINDOW TO CRAZE.
E. Wipe dry with a clean damp chamois.
NOTE: Do not rub surface with a dry cloth. It causes scratches and builds up an electrostatic charge which attracts dust particles.
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PASSENGER COMPARTMENT WINDOWS - INSPECTION/CHECK
1. Passenger Compartment Window Inspection
A. General
(1)
During inspection of windows, if damage or normal deterioration of a component of the window installation exceeds limits described, remove window and replace component (Ref Removal/Installation).
(2)
Definitions of various types of damage are as follows:
(a)
Crazing: Series of very fine fissures perpendicular to surface of plastic. Due to extremely narrow width of fissures, crazing is very difficult to detect when viewed normal to surface. It can be seen by reflection from smooth surfaces of fissures when viewed at varying angles to the incident light.
(b)
Crack: A fissure which has visible width when viewed parallel to the faces of the fissure. A crack may propagate at any angle to surface of a plastic pane depending on direction of the driving force. Cracks in stretched acrylic may have chevron or clam shell growth lines (Fig. 603).
(c)
Scratch: The removal or displacement of material from surface of a pane along a line. The ratio of depth to width is usually quite small.
(d)
Chips:
1) Spall (Shell Type) Chips have circular or curved periphery with many fine hairlines or ridges that follow the outline of outer edge and degenerate toward the center of deepest point of chip, similar to a clam shell.
2) Vee shaped chips have sharp narrow "V" shape and appear to propagate toward the interior of plastic.
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