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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 - Unpublished Work - See title page for details.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 - Unpublished Work - See title page for details. 56-41-0 Page 3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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