S 378-006-B00

 (4)  
Apply a layer of Spraylat to the window with a brush or spray or apply an approved tape for storage.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 VIEWER AND OBSERVATION WINDOWS - DESCRIPTION AND OPERATION
__________________________________________________________
 1.  General_______
 A.  The inspection and observation equipment consists of main gear downlock viewer and a nose gear downlock viewer. The main gear downlock viewer is located in the aisleway of the main cabin floor over the wheel well area and is arranged to provide inflight visual inspection of the main gear downlock indicators when the main gear is down and locked. The nose gear downlock viewer is installed above the nose gear wheel well and is arranged to provide inflight visual inspection of the nose gear drag link locking components when the nose gear is down and locked.
 2.  Main Gear Downlock Viewer_________________________
 A.  The main gear downlock viewer provides a positive means for inflight visual inspection of the main landing gear downlock indicators. The cover over the window of downlock viewer is located in the floor near the aisleway of the main cabin over the wheel well area at approximately station 700 at LBL 11.50. The plywood cover is hinged by tape to the floor panel to allow exposure of viewer window. The viewer consists of the window and two mirrors mounted in an aluminum alloy viewer tube assembly which is attached to the wing center section pressure web structure. The two-ply, 0.125-inch, glass window is mounted in a silicone rubber seal in a retainer ring which is secured over the upper end of the viewer tube. The two mirrors are mounted with sponge rubber backing on retainers attached to brackets. The brackets are attached to a bottom plate that is secured to the lower end of the viewer tube. Two drain holes are located in the bottom plate. The mirrors are aligned with cutouts in the viewer tube and are arranged so that the main landing gear downlock indicators are centered in the field of vision of each mirror. Red paint stripes are located on the main gear lower side strut and the lower downlock link. When the main gear is down and locked, the red paint stripes on the lower side strut will align with the red paint stripe on the lower downlock link. A light is provided for illuminating this area.
 3.  Nose Gear Downlock Viewer_________________________
 A.  Operation
 (1)  The nose gear downlock viewer provides inflight visual inspection of the nose gear drag link locking component when the gear is down and locked. The viewer components are aligned so that the minimum field of view will include the nose gear lock brace and the indicator, with image centered in the window (Ref. Chapter 32, Landing Gear).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
MAIN GEAR DOWNLOCK VIEWER SEE A
NOSE GEAR DOWNLOCK VIEWER
SEE B TAPE HINGE
FLOOR PANEL
VIEWER COVER
WING CENTER SECTION PRESSURE WEB STRUCTURE
RETAINER RING
VIEWER WINDOW
VIEWER TUBE
RUBBER SEAL
GUIDE PIN HOLE
BOTTOM PLATE
MIRROR BRACKETS
MIRROR RETAINER
(2 LOCATIONS)

MIRROR
DRAIN HOLE (2 LOCATIONS) (2 LOCATIONS)
SPONGE RUBBER BACKING (2 LOCATIONS)
MAIN GEAR DOWNLOCK VIEWER
A
Viewers and Observation Windows
Figure 1 (Sheet 1)

B72652
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 ALL  ú ú B02 Page 2 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
REMOVABLE FLOOR PANEL
HINGE PIN
GASKET (2 LOCATIONS)
　
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