K. Install removable floor panel (2) on control cabin floor structure (4). Position upper flanged pan
(15) to align with viewer cutout in the floor panel before installing bolts.
L. On airplanes not incorporating SB 53-1109, attach upper flanged pan (15) to the floor panel (2) with the four bolts (17).
CAUTION: MAKE SURE THE OUTER GASKET IS IN PLACE BEFORE INSTALLING BOLTS IN THE UPPER FLANGED PAN.
M. On airplanes incorporating SB 53-1109, install the upper window retention plate with the four fasteners.
N. Tighten clamps (13) that secure hose (7) to upper tube (14) and lower tube (12).
7. Restore Airplane to Normal Configuration
A. Remove the protective cover from each window.
B. Visually check that the image of the nose gear downlock indicator is centered in the viewer window (16, Fig. 401). Refer to Landing Gear, Chapter 32.
C. Close viewer cover (5).
D. Install the access panel on the side of the nose wheel well structure.
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Feb 20/93 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 56-41-31 Page 407
NOSE GEAR DOWNLOCK VIEWER - INSPECTION/CHECK
1. Nose Gear Downlock Viewer Check
A. Check Nose Gear Downlock Viewer
(1)
Open viewer cover.
(2)
Turn on light switch.
(3)
Visually check that the nose gear downlock indicator is visible through the viewer window.
(4)
Turn off light switch.
(5)
Close viewer cover.
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May 15/67 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 56-41-31 Page 601
NOSE GEAR DOWNLOCK VIEWER - CLEANING/PAINTING
1. General
A. The upper surface of the upper window can be cleaned from the control cabin without viewer removal. The lower surface of the lower window can be cleaned from the nose wheel well without viewer removal. Window surfaces inside the viewer assembly must be accessed by first removing, then disassembling the viewer.
B. The window surfaces inside the viewer can become stained with nicotine and may require periodic cleaning.
2. Clean Nose Gear Downlock Viewer Assembly and Windows
A. Remove and disassemble viewer per 56-41-31 R/I, steps 3 and 4.
B. Clean viewer assembly and windows and reassemble per 56-41-31 R/I, step 5.
C. Install viewer and restore airplane to normal per 56-41-31 R/I, steps 6 and 7.
D. Check operation of viewer (Ref 56-41-31 I/C).
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APU FIRE EXTINGUISHER BOTTLE WINDOW - REMOVAL/INSTALLATION
1. General
A. The window pane in the APU fire extinguisher bottle window consists of a single sheet of formed, round, acrylic plastic. It is mounted on an aluminum doubler ring which is attached and sealed to the outer skin panel. The window is installed in an unpressurized compartment of the fuselage. Access to the window is gained through the section 48 access and blowout door.
2. Equipment and Materials
A. Cellulose Acetate Sheeting
B. Masking Tape
C. Boiled Cheesecloth or equivalent
D. Castile Soap
E. Chamois
3. Remove APU Fire Extinguisher Bottle Window (See figure 401.)
A. Apply protective covers of cellulose acetate to accessible surfaces of the window pane if it is to be removed and later reinstalled. Secure covers with masking tape.
B. Remove the six mounting bolts attaching the window assembly to fuselage structure.
C. Remove window assembly.
D. Remove retainer ring and silicone rubber seal from window pane.
E. Apply a protective cover to uncovered surfaces of window pane if it will later be reinstalled.
4. Install APU Fire Extinguisher Bottle Window (See figure 401.)
A. Remove protective covering from the surfaces of the window pane.
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