MAIN GEAR DOWNLOCK VIEWER - INSPECTION/CHECK
1. Main Gear Downlock Viewer Check
A. Check Main Gear Downlock Viewer
(1)
Unfold passenger cabin aisle rugs over viewer cover and open viewer cover.
(2)
Turn on light switch.
(3)
Visually check that the image of each main gear downlock indicator is visible in the mirrors.
(4)
Turn off light switch.
(5)
Close viewer cover, unfold passenger cabin aisle rugs over viewer cover and tape down.
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NOSE GEAR DOWNLOCK VIEWER - REMOVAL/INSTALLATION
1. General
A. The nose gear downlock viewer window and cover are located in the control cabin floor above the nose gear wheel well (Fig. 401). Normal servicing requires only the cleaning of the upper surface of the upper window which is located under the viewer cover and the outer surface of the lower window which is situated in the nose wheel well upper structure.
B. On airplanes incorporating SB 53-1109, the upper window can be removed without removing the viewer by removing the upper window retention plate on the floor of the control cabin.
2. Equipment and Materials
A. Cellulose acetate sheeting, Permacel Tape No. 76, Minnesota Mining and Manufacturing
Company, Tape No. 221, or Transparent Cellophane No. 600, Spraylat SC-1058R
B. Masking tape
C. Wooden or plastic scraper
D. Cheesecloth
E. Sealant - BMS 5-44, Class B
F. Aliphatic Naphtha - TT-N-95A, Type II
NOTE: Freon-TF may be used in lieu of aliphatic naphtha, TT-N-95A, Type\II for general cleaning of windows.
G. Castile soap
H. Adhesive - BMS 5-105 Type II Class 1 or 2
I. Sandpaper
3. Prepare Nose Gear Downlock Viewer for Removal
A. Open viewer cover (5, Fig. 401) exposing viewer window (16).
B. Apply a protective covering of cellulose acetate sheeting, or equivalent, to accessible surfaces of the windows (9 and 16) which are to be removed and reinstalled. Secure with masking tape.
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C. Remove the aft left access panel on the side of the nose wheel wel1 structure to gain access to the viewer installation.
4. Remove Nose Gear Downlock Viewer
A. On airplanes incorporating SB 53-1109, do as follows:
(1)
Remove the 4 fasteners attaching the upper window retention plate (20) and remove the plate.
(2)
Before you remove other components of the viewer, examine the condition of the upper window (16).
(3)
Do a check to see if there is condensation or fogging on the window.
B. Remove the upper window (16) and the 2 gaskets.
C. Remove bolts attaching lower flanged pan (11) Fig. 401 to the nose wheel well upper structure (10).
D. On airplanes not incorporating SB 53-1109, support the viewer assembly and remove bolts (17) attaching upper flanged pan (15) to the floor panel (2).
E. Remove the floor panel (2) from the control cabin floor structure (4).
F. On airplanes incorporating SB 53-1109, remove the foam filter (19) from the upper viewer tube
(14) if there is condensation or fogging on the window (16).
Note: The foam filter is bonded onto the viewer. You must remove with sandpaper the adhesive and remaining filter material completely before you replace the filter.
G. Remove viewer assembly by lifting it upward through the opening in the control cabin floor.
H. Disconnect clamps (13) and remove hose (7) from lower tube (12) and upper tube (14).
I. Remove window (16) from upper flanged pan (15).
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