H30760
Passenger Cabin Window Plate (Plug) Installation 500
56-21-11 Figure 401 Nov 15/79
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
EMERGENCY EXIT HATCH WINDOW - DESCRIPTION AND OPERATION
1. General
A. The emergency exit hatch window, installed in each emergency exit hatch in the passenger cabin, is located in the upper portion of the hatch and is similar in external appearance to the passenger windows. (See figure 1.) The window consists of outer, middle and inner panes. The inner pane is nonstructural and is mounted in the emergency exit hatch trim panel which is described in Emergency Exit Hatch Lining, Chapter 52. The outer and middle panes are each capable of taking the cabin ful1 pressurization load. All three panes are acrylic, the structural panes being formed to improve resistance to crazing.
B. Each emergency exit hatch window is designed as a plug type window subject only to the pressure acting on it. The outer window pane of stretched acrylic plastic is rectangular in shape with rounded corners and a routed outer edge to fit the window outboard frame. The pane is curved to fair with the fuselage contour. The middle window pane of modified acrylic sheet is similarly shaped but with an unrouted edge which is seated on the window inboard frame.
C. The outer pane has a peripheral seal of molded synthetic silicone rubber. An outer pane spring assembly and ten outer pane spring retainers secure the outer pane in position on the window outboard frame. The center pane is pressure sealed to the window inboard frame and outer reveal and is secured by screws which are spaced around the periphery of the window retainer.
D. The emergency exit hatch window is designed to preclude fogging and frosting by means of multiple pane construction with intervening cavities essentially isolated from cabin interior air conditions and supply air conditions.
500
May 15/67 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 56-22-0 Page 1
H26296
Emergency Exit Hatch Window Installation 500
56-22-0 Figure 1 Aug 15/72
Page 2
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
EMERGENCY EXIT HATCH WINDOW - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Cellulose acetate sheeting, Permacel Tape No. 76, Minnesota Mining and Manufacturing Tape No. 221 or Transparent Cellophane No. 600, Spraylat SC-1058R
B. Masking tape
C. Wooden or plastic scraper
D. Cheesecloth
E. EC 1128 - Minnesota Mining and Manufacturing Co.
F. Aliphatic Naphtha, TT-N-95A, Type II
NOTE: Freon-TF may be used in lieu of aliphatic naphtha, TT-N-95A, Type II, for general cleaning of windows.
G. Castile soap
2. Prepare Emergency Exit Hatch Window for Removal
A. Remove emergency exit hatch trim panel (Ref Chapter 52, Emergency Exit Hatch Lining.
B. Apply protective covering of cellulose sheeting to accessible surfaces of window panes which are to be removed and reinstalled. Secure cover with masking tape if necessary.
3. Remove Emergency Exit Hatch Window
A. Remove window retainer screws (2, Fig. 401) and retainer (3) so that middle window pane (5) can be removed.
B. Remove middle pane (5), seal (4), and window outer reveal (6).
CAUTION: IF PANE IS TO BE REINSTALLED, A PROTECTIVE COVERING OF CELLULOSE SHEETING SHOULD BE APPLIED TO SURFACES TO PREVENT DAMAGE DURING HANDLING.
USE CARE IN HANDLING PLASTIC REVEAL. SURFACES VISIBLE TO CABIN INTERIOR MUST BE FREE OF MARKS, SCRATCHES AND DENTS.
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