Flight Compartment Window Location
Figure 1
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A
737-300/400/500MAINTENANCE MANUAL
CONTROL CABIN FIXED WINDOWS - DESCRIPTION AND OPERATION
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1. Window No. 1____________
A. The windshields are of laminated construction. They are designed to withstand bird impact with or without window heat.
B. Number 1 windows from three different manufacturers can be installed. These manufacturers are PPG, Triplex, and Sierracin. These windows are completely interchangeable regardless of the manufacturer. Windows by different manufacturers may be mixed on the airplane. Subtle differences in the windows may be noticed.
C. 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.
D. The different layers of the windows expand and contract at different rates during a change in temperature. This can cause the layers to pull against each other at their interface with great force causing internal glass chipping and vinyl interlayer cracking, especially around the edges. To prevent this windows have thin layers of a slippery material around the edges, called parting material or slip planes, to allow the window layers to slide against each other during expansion and contraction. Some windows have soft material layers around the edges or across the whole window that will flex when the main structural layers pull against them.
E. A conductive film, applied on the inner face of the outer 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.
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.
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A 737-300/400/500MAINTENANCE MANUAL
MATERIAL THICKNESS
___PPG SIERRACIN
GLASS 0.1875 0.1875 OR 13/64
VINYL 0.380 0.380
CUSHION (PR1422 PPG, GLASS 0.500 0.500
GLASS 0.1875
VINYL 0.450
GLASS 0.470
SLIP
CONDUCTIVE
PLANES
COATING
WINDOW NO. 1 (TRIPLEX)
Control Cabin Window Cross Sections Figure 1 (Sheet 1)
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