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B.  Wipe off solvent before it has evaporated with clean, oil and lint-free absorbent material such as Finetex, new cheesecloth, or equivalent.
C.  Repeat application of clean solvent as necessary.
D.  Mix EC-1300L adhesive compound thoroughly before using. Adhesive which has thickened excessively or jelled shall not be used.
E.  Apply two thin, uniform brush coats of adhesive to faying surfaces on the window (7) and seal (8). Allow 30 minutes drying time at room temperature between coats.
F.  Allow the last coat of adhesive to dry until it is tacky, but will not transfer to the knuckle when touched lightly. This will require 10 to 20 minutes at room temperature.
NOTE:  Adhesive may be reactivated by lightly wiping one surface with a clean cheesecloth saturated with solvent.
G.  Shape and bend the new rubber seal (8) around the glass window (7) while adhesive is tacky, applying sufficient pressure to ensure intimate contact. Care must be taken to avoid entrapping air pockets.
500 
May 01/98  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  56-41-21 Page 403 

H.  The assembly may be handled immediately. Full strength is not developed for 24 hours or longer at room temperature.
I.  Remove excessive adhesive with naphtha. Wipe dry with a clean oil and lint-free cheesecloth or equivalent.
J. Clean retainer ring (9) and upper surface of ring on the tube (10) by wiping surfaces with a clean cheesecloth saturated with naphtha. If a residue of hardened adhesive is present, use wooden or plastic scraper to dislodge the material.
K. Wipe off solvent before it has evaporated with a clean, oil and lint-free cheesecloth or
equivalent.

L.  Immediately prior to installation, remove protective cover from viewer window (7) and clean the window with lukewarm water and castile soap applied with a soft material such as boiled cheesecloth. Rinse with clean water and wipe dry.
NOTE:  Steps "A" through "L" are necessary only if a replacement window or window seal is being installed.
M.  Clean interior surfaces of viewer tube (10), upper surface of bottom plate (13) and surfaces of mirror brackets (12). Use an oil and lint-free cheesecloth or equivalent. Make sure drain holes
(14) in bottom plate (13) are open.
N. If new sponge rubber backing (18) is to be installed, clean mirror retainer (19) and upper surfaces of mirror brackets (12) with naphtha. Wipe dry before the solvent has evaporated with a clean oil and lint-free cheesecloth or equivalent.
O.  Apply a uniform layer of Q-3-0121 adhesive compound over one or both surfaces to be bonded on the mirror (17), rubber backing (18), and mirror retainer (19).
P.  Join the surfaces as soon as possible after adhesive application. Exposure to the air for more than a few minutes will cause the adhesive to form a skin which interferes with adhesion.
Q.  Apply sufficient pressure to ensure complete contact but not enough to squeeze out an excessive amount of adhesive. A bond line thickness of at least 15 mils gives best results.
NOTE:  Steps "N" through "Q" are necessary only if a replacement mirror, new sponge rubber backing or mirror retainer is being installed.
6.  Install Main Gear Downlock Viewer
A.  Install viewer window (7, figure 401) with rubber seal (8) on upper surface of ring on top of viewer tube (10).
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56-41-21  Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/98 

H29392
500  Main Gear Downlock Viewer 
May 15/67  Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  56-41-21 Page 405 

CAUTION:  MAKE SURE THE WINDOW RUBBER SEAL (8) IS IN PLACE AND A CLEAN PROTECTIVE COVER IS POSITIONED OVER THE UPPER VIEWING SURFACE ONLY OF THE WINDOW.
B.  Secure the window (7) and seal (8) on upper ring of tube (10) with retainer ring (9), flat  washer (1) and eight hex head bolts (2).
CAUTION:  PRESS DOWN ON THE RETAINER RING WHILE TIGHTENING BOLTS TO ENSURE A PRESSURE TIGHT JOINT.
C.  Remove protective cover from window (7) and install removable floor panel (5) on the pressure web structure (6).
D.  Install viewer cover (3) and tape hinge (4).
NOTE:  Steps "A" through "D" are necessary only if a replacement window or window seal is installed.
E. If mirror (17), the rubber backing (18) or mirror retainer (19) was removed from mirror bracket
(12) install these items on the mirror bracket (12) with flat washer (20) and pan head screw (21).
F.  Immediately prior to installation remove protective covers from mirrors and clean each mirror with lukewarm water and castile soap applied with a soft cloth, such as boiled cheesecloth. Rinse with clean water and wipe dry with an oil and lint-free cheesecloth or equivalent.
　
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