B. Remove retaining angle bolt (14, Detail B) from doubler (13), retaining angle (15) and window frame post (12).
C. Apply hand pressure to outside of window to break seal, and remove window. 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 spacers (2) and the silicone rubber molded-in-place pressure seal (10) with bumper strip (11) and bead (9) are removed with the window assembly.
D. Remove any remaining aerodynamic smoother from window frame.
CAUTION: TAKE CARE NOT TO DAMAGE METAL ON WINDOW OR THE WINDOW FRAME.
5. Prepare Window No. 1 for Installation
A. The new bolts, nuts, etc. that come with the windshield should be presorted for installation.
B. 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.
C. Examine window frame (8, Fig. 401), to determine if fairing compound requires repair.
NOTE: Spacer (2) will crush the fairing compound on structure locally around end of the spacer. The 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 the fairing compound is cracked, chipped, broken away, or damaged in any way, repair it as described in Fairing Compound - AR (Ref 56-11-0-8).
D. Do a visual check of the window post and sill for cracks and corrosion.
E. Check window resistance (Ref 30-41-21 A/T).
F. Apply protective tape cover to both window surfaces, aligning tape with edges of glass panes.
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Jun 20/91 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 56-11-11 Page 407
G. Clean faying surfaces of pressure seal, faying surfaces of window frame, and window frame post, 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 surface. Repeat cleaning until surfaces are free of residual film, taking care not to damage or deform either faying surface.
WARNING: NAPHTHA IS FLAMMABLE AND HAZARDOUS. USE IN A WELL VENTILATED AREA. AVOID PROLONGED BREATHING OF VAPORS. AVOID EYE AND SKIN CONTACT. KEEP AWAY FROM SPARKS AND FLAMES.
H. Position window (1) in window frame (8) and window frame post (12) and check that a uniform gap exists between outside edge of the window and fuselage outer skin.
(1)
On windows without Z-channel strip, examine that bumper strip on beaded silicone rubber molded-in-place pressure seal (10) is properly positioned in window frame (Details A thru D, Fig. 401).
(2)
Examine that aluminum spacers (2) are inserted in boltholes of window assembly (1).
NOTE: Retain spacers in boltholes by friction or other means until retaining bolts and attaching nuts are installed. Do not bond spacers. Spacers must be free to move on bolts and within boltholes in window.
(3)
Treat bolt shanks with a corrosion preventive compound just prior to installation.
6. Install Window No. 1
A. Equipment and Materials
(1)
Tape - Scotch Cal No. 639 (Ref 20-30-51)
(2)
Corrosion Preventive Compound - MIL-C-11796, Class 3 (Ref 20-30-21)
B. Install window in frame.
CAUTION: MAGNETIC OR HIGH PERMEABILITY MATERIALS SHALL NOT BE INSTALLED WITHIN A 20-INCH RADIUS FROM THE CENTER OF THE MAGNETIC COMPASS, NOR SHALL THEY BE INSTALLED NEARBY IF, AFTER MAINTENANCE REMOVAL, THEY MIGHT BE INSTALLED WITHIN THE 20-INCH RADIUS.
(1)
Apply corrosion preventive compound to the fasteners.
(2)
Install retaining bolts (3, Details A, C and D) into position previously removed from (refer to IPC 56-10-00-01 for new parts and their location).
CAUTION: USE ONLY NONMAGNETIC BOLTS (HEAT TREATED TO 140,000 PSI) ALONG TOP, BOTTOM, AND FORWARD EDGES BECAUSE OF PROXIMITY OF STANDBY COMPASS. BOLTS ATTACHING WINDOW RETAINING ANGLE AT AFT EDGE ARE NOT STANDARD AND MUST BE REPLACED ONLY BY IDENTICAL BOLT. OBSERVE SPECIFIED TORQUE FOR BOLTS ON EACH WINDOW INSTALLATION AS DAMAGE CAN RESULT IF TORQUE IS EXCEEDED.
(3)
Install silicone rubber seal washer (16, Details C and D) aluminum washer (17), hexnut (18, Detail C) and self-locking nut (7, Detail D), finger-tight at this time.
(4)
Install O-rings (4, Detail A), flat washers (5) and wire clamps (6).
(5)
Install self-locking hex head nuts (7, Detail A), finger-tight at this time.
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