(2)
If ethylene propylene O-rings are used on fasteners adjacent to the bus bar terminals, trim O-ring as shown in Fig. 401 to provide minimum gap. This step unnecessary if nonconductive rubber O-rings are installed on adjacent windshield fasteners.
(3)
Brush terminals with a single coat of insulating coating compound, BMS 5-37.
(4)
Install insulating boot over terminal connection.
B. Install drain pan, drain tube clamps at window post on airplane centerline, and sunshade support rod above window.
C. Install lightshield (glareshield) brackets or clips, if previously removed.
D. Install lightshield (glareshield) (Ref 25-11-21).
E. Install trim panels and crash padding where necessary (Ref 25-16-41).
F. Install seat adjustment sight gage (Ref 25-11-31).
G. Remove protective cover from inside surface of window.
H. Test window heating system (Ref 30-41-0 A/T).
I. Rerig windshield wiper blade as required (Ref 30-42-11 R/I).
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WINDOW NO. 1 - INSPECTION/CHECK
1. General
A. The inspection/check of window No. 1 should be in accordance with established window damage criteria in addition to the following (Ref 56-11-0, Control Cabin Windows - Damage Criteria).
2. Window No. 1 Inspection
A. Examine and replace the No. 1 window if any of the following is found:
NOTE: You may find 0.08 inch diameter tong marks at the upper and lower inboard corners of the window. Tong marks are acceptable on the inner and outer glass pane provided the tong marks do not extend more than 0.50 inch (maximum) from the edge of the outer glass pane. Tong marks on the window occur during the fabrication of the window when it is hung to cool after tempering.
(1) Outer Glass Pane:
(a)
Cracks, chips, delamination which decrease the visual capacity.
(b)
Cracks, chips, delamination or an intermittent operation which cause the No. 1 window heat system to not operate.
(c)
Arcing, electrical discontinuity or cracks rendering main window heating system inoperative.
NOTE: Refer to limitation section, Boeing 737 Flight Manual for control cabin window heat requirements. Outer pane is not a structural member. No. 1 window replacement due to outer pane damage should be based upon window heat and visibility requirements and can be delayed to the nearest maintenance interval. Window heat leads should be disconnected and secured if replacement is delayed.
(2)
Inner Glass Pane:
(a)
Cracks of any kind.
(b)
Scratches deeper than 0.015 inch.
(c)
Conchoidal chips in either surface, deeper than 0.015 inch.
(d)
V-shaped chips of any kind.
(3)
Middle Vinyl Pane
(a) Cracks of any kind.
B. Examine Window No. 1 For Delamination
(1) Delamination is the separation of glass pane from adjacent vinyl inner layer. Affected area may be clear but will be cloudy if penetrated by moisture. Electrical heating system may be affected. Since delamination has no affect on the structural integrity of the windshield, the following limits are to be used as approximate guidelines for window replacement. Minor variations from these limits are acceptable providing flight personnel have not indicated that visibility is affected.
(a)
Isolated delamination areas (island delamination) with diameter of 3/4 inch or more and located more than 2 inches from nearest edge.
(b)
Continuous edge delamination which extends 2-1/2 inches or more from the originating edge (top or side), 3-1/2 inches or more top corner radius, 2 inches or more from the bottom edge or 3 inches or more from a lower corner toward the center of the panel.
(c)
Any dalamination that is cloudy (indicating moisture between the vinyl and glass).
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Jun 20/93 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 56-11-11 Page 601
C. Examine and replace aerodynamic smoother (sealant) if any of the following are found:
(1)
Erosion
(2)
Gaps or voids
(3)
Does not overlap the glass
(4)
Is not bonded to the glass
NOTE: An unsharpened pencil can be used in determining sealant adhesion. Depress wooden tip on sealant surface gently and push away from windshield with a very slight force. Do not apply too much pressure - i.e., not enough to penetrate surface of sealant or to break a good bond. If sealant is loose, a very small force will show a gap between glass and sealant.
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