5. Prepare Nose Gear Downlock Viewer for Installation
A. Remove sealant residue from interior surfaces of the flanged pans (11 and 15, figure 401) with a cloth moistened with aliphatic naphtha. Use wooden or plastic scraper to dislodge adhesive. Wipe dry before solvent has evaporated with clean cheesecloth or equivalent. Dry with an oil and lint-free cloth.
B. Clean interior surfaces of lower tube (12), hose (7), and upper tube (14) with a clean cloth moistened with aliphatic naphtha. Wipe the surfaces dry with an oil and lint-free cloth.
C. On airplanes with SB 53-1109, if the foam filter was removed, lightly sand the upper tube to remove any foam that has not come off. Wipe the surface with a clean cloth moistened with aliphatic naptha. Wipe the surface dry with an oil and lint free cloth before you install new foam filter.
D. If new gaskets (8) and slotted phenolic rings (18) are to be installed, clean faying surface of each window and ring with a cloth moistened with aliphatic naphtha. Wipe dry before the solvent has evaporated with an oil and lint-free cloth.
E. Immediately before use, thoroughly blend components of BMS 5-44, class B, sealant. Apply a thin, even coat of the sealant to each faying surface of the windows (9 and 16), gaskets (1 and 8) and the slotted phenolic rings (18).
F. Assemble the two gaskets (l) on window (16).
G. Assemble the two slotted phenolic rings (18) and the two gaskets (8) on window (9). Locate the phenolic ring slots adjacent to each face of the lower window. Apply a firm, uniform pressure to ensure complete contact of the faying surfaces.
H. Wipe off excessive sealant before it has cured, using a clean cloth moistened with aliphatic naphtha.
CAUTION: MAKE SURE THE DRAIN SLOTS IN THE PHENOLIC RINGS ARE FREE OF SEALANT AND ARE OPEN.
I. Remove protective covers and clean each window with lukewarm water and castile soap applied with a soft cloth, such as boiled cheesecloth or equivalent. Rinse with clean water and wipe dry with an oil and lint-free cloth.
528
Feb 20/93 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 56-41-31 Page 403
EFFECTIVITY
AIRPLANES NOT INCORPORATING SB 53-1109
H26448
Nose Gear Downlock Viewer Installation 5E7
56-41-31 Figure 401 (Sheet 1) Oct 20/89
Page 404
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
5E7 Nose Gear Down Lock Viewer Installation
Feb 20/93 Figure 401 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 56-41-31 Page 405
J. Install a clean protective cover of cellulose acetate sheeting, or equivalent, over one surface only of each window.
CAUTION: DO NOT COVER THE GASKET.
6. Install Nose Gear Downlock Viewer
A. Apply a thin, even coat of the sealant to faying surfaces of the gaskets (1 and 8, Fig. 401) and gasket seat on upper flanged pan (15) and lower flanged pan (11).
B. Install window (16) in upper flanged pan (15). The protective cover is attached to the outer upper surface only of the window.
CAUTION: MAKE SURE THE GASKETS ARE IN PLACE BEFORE INSTALLING THE WINDOWS.
C. Install window (9) with the slotted rings (18) and gaskets (8) in lower flanged pan (11). The protective cover is attached to the outer lower surface only of the window.
D. Apply a firm, uniform pressure on each window gasket to ensure complete contact of the faying surfaces.
E. Wipe off excessive sealant before it has cured, using a clean cloth moistened with aliphatic naphtha.
F. Install spacer (19) in the lower flanged pan with BMS 5-44, class B, sealant.
G. On airplanes with SB 53-1109, if the foam filter (19) was removed, install the foam filter using BMS 5-105 Type II. Make sure the viewer is free from old adhesive and foam filter.
WARNING: ADHESIVE BMS 5-105 CONTAINS ISOCYANATES. AVOID SKIN CONTACT AND INHALATION OF VAPORS. MIX AND USE IN OPEN AREAS WITH SUFFICIENT AIR CIRCULATION.
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