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1. General
A.  The inspection and observation equipment consists of main gear downlock viewer, nose gear downlock viewer, and APU fire extinguisher bottle window (Fig. 1). 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. The APU fire extinguisher bottle window is located on right aft lower surface of the fuselage. The window provides a rapid means for ground personnel to read gages on the APU fire extinguisher system which are visible through the window from exterior of airplane.
2.  Main Gear Downlock Viewer
A.  The purpose of the main gear downlock viewer is to provide a positive means for inflight visual inspection of the main landing gear downlock indicators (Detail A, Fig. 1). The cover over 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 on sponge rubber backing on mirror retainers that are attached to mirror 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 the indicator.
546 
Feb 01/76  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  56-41-0 Page 1 

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Viewers and Observation Windows  546 
56-41-0 Page 2  Figure 1 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 01/76 

546  Viewers and Observation Windows 
Feb 01/76  Figure 1 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  56-41-0 Page 3 

3.  Nose Gear Downlock Viewer
A.  The nose gear downlock viewer is arranged to provide inflight visual inspection of the nose gear drag link locking components when the gear is down and locked (Detail B, Fig. 1). The nose gear viewer window and cover are located in the control cabin floor above the nose gear wheel well. The viewer cover is attached to the floor and is opened to allow exposing of the viewer window. The viewer consists of the cover and two windows mounted in an aluminum alloy tube assembly. The upper end of the upper tube contains a 0.250-inch thick stretched acrylic sheet window cushioned by synthetic rubber seal gaskets in the upper flanged pan. The upper pan is bolted to the control cabin floor structure. The lower window of 0.250-inch thick glass is mounted between slotted phenolic rings, with the slots adjacent to the window, and sealed by synthetic rubber seal gaskets in the lower flanged pan on the lower end of the lower tube. A phenolic spacer is located under the flange of the lower flanged pan. The lower pan is bolted to the nose wheel well upper structure. The two tubes are connected by a hose and clamps. Four small equally spaced breather holes are provided in the viewer tube through which cabin air is introduced. The air flows over the lower window reducing fogging and is bled overboard through the slots in the phenolic rings. The slots also provide water drainage from the viewer. The viewer components are aligned so that the minimum field of vision will include the nose gear lock brace and the indicator, with the image centered in the window (Ref Chapter 32, Landing Gear).
B.  On airplanes not incorporating SB 53-1109, all of the nose gear downlock viewer must be removed and disassembled to remove the upper and lower windows for replacement or cleaning.
C.  On airplanes incorporating SB 53-1109, the upper window can be removed for replacement or cleaning by removing a window retention plate on the floor of the control cabin. All of the viewer must be removed to remove the lower window.
　
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