FIXED CONTROL CABIN WINDOWS - DESCRIPTION AND OPERATION
1. Window No. 1 (Forward Windshield)
A.  The construction of window No. 1 consists of a glass pane laminated to each side of a polyvinyl butyral (vinyl) interlayer or core (Fig. 1). The inner glass pane is the thicker of the two and is the primary load carrying member. The vinyl interlayer, or core, acts as the "fail-safe" load carrying member and prevents the window from shattering if the inner pane should break. The outer pane has no structural significance, but provides rigidity and a hard, scratch resistant surface. A thin strip of parting medium is laminated around the window edges between the vinyl interlayer and each glass pane. This is to prevent edge chipping of the glass under conditions of differential expansion and contraction.
B.  A conductive film, applied on the inner face of the outer glass pane permits electrical heating for anti-icing and defogging. On No. 1 windows with Z-channel seal, an additional forward and aft edge heater is embedded in the vinyl core near the inner pane surface. Bus bars molded into the upper and lower edges of the windows in contact with the conductive film are connected to electrical terminals. For further information concerning window anti-icing and defogging refer to Chapter 30, Control Cabin Window Anti-Icing System.
C.  Number 1 windows from three different manufacturers can be installed. These manufacturers are PPG, Triplex, and Sierracin. These windows are completely interchangeable. Windows by different manufacturers may be mixed on the airplane. Subtle differences in the windows may be noticed.
2.  Window No. 3 (Crew Side Window)
A.  The construction of No. 3 window consists of two stretched acrylic panes separated by a phenolic spacer (Fig. 1). The spacer is attached to the panes by low-tack pressure sensitive tape which also acts as an air seal. The spacer provides an insulation cavity which prevents fogging on the inner surface of the windows. There is a small hole in the upper forward corner of the inner pane. This hole must be open at all times to allow pressure in the air space to equalize with pressure in the cabin.
3.  Window No. 4 (Eyebrow Window)
A.  The construction of window No. 4 consists of a glass pane laminated to each side of a polyvinyl butyral (vinyl) interlayer, or core, with an additional vinyl layer laminated to the inboard surface of the inner pane. A cast acrylic sheet is laminated to the additional vinyl layer (Fig. 1). These additional layers prevent glass from scattering throughout the cabin in the event of bird impact. The additional layers are of no structural importance. On PPG and Sierracin windows a thin parting medium is laminated around the window edges between the vinyl interlayers and each glass pane. This is to prevent edge chipping of the glass under conditions of differential expansion and contraction. Triplex windows have a soft vinyl layer around the edge of the window between the outer glass pane and the outer vinyl layer and between the inner glass pane and the outer vinyl pane, instead of the parting medium.
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B.  A conductive film, applied on the outer face of the inner glass pane permits electrical heating for anti-icing and defogging. Bus bars molded into the upper and lower edges of the windows in contact with the conductive film are connected to electrical terminals. For further information concerning window anti-icing and defogging refer to Chapter 30, Control Cabin Window Anti-Icing System.
4.  Window No. 5 (Eyebrow Window)
A.  The construction of window No. 5 consists of a glass pane laminated to each side of a polyvinyl butyral (vinyl) interlayer or core (Fig. 1). On PPG windows a thin strip of parting medium is laminated around the window edges between the vinyl interlayer and each glass pane to prevent edge chipping of the glass under conditions of differential expansion and contraction. Triplex windows have thin layers of soft vinyl between the glass and vinyl structural layers as well as slip panes (parting medium) included in the vinyl core layer around the edge of the window.
B.  A conductive film, applied on the outer face of the inner glass pane permits electrical heating for anti-icing and defogging. Bus bars molded into the upper and lower edges of the windows in contact with the conductive film are connected to electrical terminals. For further information concerning window anti-icing and defogging refer to Chapter 30, Control Cabin Window Anti-Icing System.
5.  Fixed Window Seals and Sealants
A.  General (Fig. 2)
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The fixed control cabin windows number 1, 3, 4, and 5 are sealed on installation by a beaded silicone rubber molded-in-place pressure seal which is molded to the window mounting surface.
　
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