D.  Replacement windows are supplied complete with the necessary parts for installation and with both sides of the pane covered with a protective 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, 33M No. 221 (Ref 20-30-51)
C.  Window frame fairing compound - EC-3587-1/4 or EC-3587-1 (20-30-11)
D.  Aliphatic Naphtha, TT-N-95A, Type II (Ref 20-30-31)
500 
Feb 15/79  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  56-11-31 Page 401 

E.  Corrosion preventive compound - MIL-C-11796, Class 3 (Ref. 20-30-21)
F.  Nylon cord - MIL-C-5040, Type 1A, or Nylon Thread, V-T-295a, Type I, Class 2, No. 9  (Ref 20-30-51)
G.  Aerodynamic smoother - Pro Seal 860 Class B or RTV 174 (BAC 5010 Type 60) (Ref 20-30-11)
H.  Spatula or flow gun
I.  Cheesecloth, lint or oil-free
3.  Prepare Window No. 4 or No. 5 for Removal
A.  Check that power is OFF in window heating circuit.
WARNING:  OUTPUT VOLTAGE OF AUTOTRANSFORMER RANGES FROM 250 TO 350 VOLTS. BE CAREFUL WHEN WORKING ON CONTROL CABIN WINDOWS.

H30518
Window No. 4 and 5 Seal Details  500 
56-11-31Page 402   Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Oct 20/84 

B.  Remove trim panels and crash padding where necessary. Refer to Chapter 25, Control Cabin Equipment.
C.  Disconnect power leads at window bus bar terminals.
D.  Remove thermal switch and bracket (11, Fig. 403B) from window frame (10) (Ref 30-41-31 – Window No. 5 only)
E.  Strip aerodynamic smoother from gap around outside edge of window.
NOTE:  A nylon cord is provided to facilitate this step. The free end of this cord is located in the upper aft corner of the window. Uncover the cord end and pull steadily until cord and smoother are removed. (Fig. 402.)
4.  Remove Window No. 4 or No. 5 (Fig. 403A or 403B)
A.  Remove self-locking nuts (2, detail A) flat washer (6, if installed), flat washer (5), O-ring (4), and retaining bolt (3) from window assembly (1) and window frame (10).
NOTE:  This step may be simplified in area of map light by snapping off map light housing and removing lamp.

H29200
500  Removal of Window Gap Filler 
Feb 15/79  Figure 402  56-11-31 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

B.  Apply hand pressure to outside of window assembly (1) to break seal, and remove window from 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 aluminum spacer (2) and beaded silicone molded-in-place pressure seal (9) are removed with the window.
C.  Remove any remaining aerodynamic smoother from window frame (10), carefully, without damaging the fairing compound (8).
CAUTION:  TAKE CARE NOT TO DAMAGE METAL OR THE FAIRING COMPOUND WHICH IS ON INBOARD FACE OF THE WINDOW FRAME.
5.  Prepare Window No. 4 or No. 5 for Installation (Fig. 403A or 403B)
A.  Check that power is OFF in window heating circuit.
WARNING:  OUTPUT VOLTAGE OF AUTOTRANSFORMER RANGES FROM 250 TO 350 VOLTS. BE CAREFUL WHEN WORKING ON CONTROL CABIN WINDOWS.
B.  Examine window frame (10), Detail A to determine if fairing compound (8) requires repair or to replace the beaded silicone rubber molded-in-place pressure seal (9).
NOTE:  Spacer (2) will crush fairing compound (8) on structure locally around end of spacer. Compound should not be repaired on subsequent window installations.
(1)  Except for the area that comes into contact with the end of the spacer (2), if fairing compound (8) is cracked, chipped, broken away, or damaged in any way, repair it as described in Fairing Compound - Approved Repairs (Ref 56-11-0).
NOTE:  Replacement windows are provided complete for installation with the beaded silicone rubber molded-in-place pressure seal (9) and aluminum spacers (2).
C.  Apply protective tape cover to both window surfaces, aligning tape with edges of glass panes.
D.  Clean faying surfaces of the seal (9) and outside gap edge of both window (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 either faying surface.
WARNING:  ALIPHATIC NAPHTHA IS FLAMMABLE.
　
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