H26817
500 No. 1 Window Delamination Limits
Feb 20/86 Figure 602 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 56-11-11 Page 603
WINDOW NO. 3 - REMOVAL/INSTALLATION
1. General
A. The number 3 window is installed with a beaded silicone rubber molded- in-place pressure seal (Fig. 401). The beaded rubber seal is molded to the window mounting surface. A continuous bead molded in the rubber seal ensures an effective pressure seal around the window.
B. Also shown on Fig. 401 are some items which are not components of the pressure seal. They are:
(1)
Aerodynamic Smoother. Aerodynamic is installed in the gap between the window frame and the edge of the window and pressure seal and provides aerodynamic flushness and protection against water entrapment. A nylon cord, or nylon thread, is installed under the aerodynamic smoother to facilitate its removal when required.
(2)
Rubber Cushion Strip and Metal Backing Plate. The rubber cushion strip is bonded to the metal backing plate. The rubber cushion strip is allowed to compress predetermined amount thereby transmitting sufficient compression load into the window assembly to compress the seal bead to make a weather seal.
C. Replacement windows are supplied complete with the necessary parts for installation and with both sides of the pane covered with a plastic coating.
2. Equipment and Materials
A. Protective covering for windows not already protected: Polyester Transparent Tape No. 850 (Ref 20-30-51)
B. Masking Tape - No. 221 (Ref 20-30-51)
C. Aliphatic Naphtha - TT-N-95A, Type II (Ref 20-30-31)
D. Corrosion Preventive Compound - MIL-C-11796, Class 3 (Ref 20-30-21)
E. Nylon Cord - MIL-C-5040, Type 1A or Nylon Thread, V-T-295a, Type I, Class 2, No. 9 (Ref 20-30-51)
F. Aerodynamic Smoother - BMS 5-95, Class B, or PRO SEAL 860 Class B (Ref 20-30-11)
G. Spatula or flow gun
H. Cheesecloth, lint and oil free
500
Feb 20/85 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 56-11-21 Page 401
3. Prepare Window No. 3 for Removal
A. Remove trim panels and crash padding where necessary (Ref Chapter 25, Control Cabin Equipment).
B. Strip aerodynamic smoother from gap around outside edge of window.
NOTE: A nylon cord, or nylon thread, is provided to facilitate this step. The free end of the cord, or thread, is located in the upper aft corner of the window. Uncover the free end and pull steadily until cord, or thread, and smoother are removed (Fig. 402).
4. Remove Window No. 3
A. Remove self-locking nuts (7, detail A, Fig. 403), support clip (6), metal backing plate (5), rubber cushion strip (4), and window retaining bolts (3) from the window assembly (1) and the window frame (10).
B. Apply hand pressure to outside of window (1) to break seal, and remove the window (1) from the window frame (10). Always apply pressure to a wide area . Bumping with a rubber mallet and a nonmetallic block may be necessary if window is particularly difficult to remove. The insert bushings (2) and the silicone rubber molded in place pressure seal (8) with the bead (9) are removed with the window.
C. Remove any remaining aerodynamic smoother from window frame.
CAUTION: TAKE CARE NOT TO DAMAGE THE WINDOW FRAME.
NYLON CORD OR NYLON THREAD
Window No. 3 Seal Details 544
56-11-21Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 1/74
H31478
5. Prepare Window No. 3 for Installation
A. Apply protective tape cover to both window surfaces, aligning tape with edges of glass panes.
B. Clean faying surface of the seal (8, detail A, Fig. 403), and outside gap edge of both window assembly (1), and window frame (10) thoroughly with aliphatic naphtha. Use a clean cheesecloth to apply naphtha and a clean cheesecloth to wipe it off. Do not allow naphtha to dry on the surface. Repeat cleaning until surfaces are free of residual film, taking care not to damage or deform faying surfaces.
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