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4.  APU Fire Extinguisher Bottle Window
A.  The APU fire extinguisher bottle window is located on the right, aft, lower surface of the fuselage (Detail C, Fig. 1). It is a small round, plug type window that is installed so that its outer surface is flush with the exterior surface of the fuselage. The window consists of a formed, round, acrylic sheet mounted on a doubler ring and secured in position by a silicone rubber seal and an aluminum retainer ring. It is attached to fuselage structure by six mounting bolts and nut plates. The window is situated so that it is accessible to ground personnel to read the pressure gauges on the APU fire extinguisher system through the window from exterior of airplane.
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56-41-0 Page 4  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Oct 20/89 

MAIN GEAR DOWNLOCK VIEWER - REMOVAL/INSTALLATION
1. General
A.  The main gear downlock viewer window and two mirrors are mounted in an aluminum alloy viewer tube assembly which is attached to the wing center section pressure web structure at approximately station 700 at LBL 11-50. In normal servicing of the viewer installation only the bottom plate (13, figure 401) with attached mirror brackets (12) and mirrors (17) are removed, cleaned and reinstalled. The interior surfaces of the viewer tube (10) and the lower surface of viewer window (7) are cleaned after the bottom plate (13) is removed.
2.  Equipment and Materials
A.  Cellulose acetate sheeting, or equivalent
B.  Masking tape
C.  Wooden or plastic scraper
D.  Cheesecloth or equivalent
E.  Castile soap
F.  Naphtha
G.  EC1300L Adhesive Compound - Minnesota Mining and Manufacturing Co., or equivalent
H.  Q-3-0121 Adhesive Compound - Dow-Corning Corporation, or equivalent
3.  Prepare Main Gear Downlock Viewer for Removal
A.  Fold passenger cabin aisle rugs above viewer cover (3, figure 401) which exposes the removable floor panel (5) above the viewer window (7), if a replacement window or window seal is to be installed or the upper surface of the viewer window is to be cleaned.
B.  Remove viewer cover (3) and tape hinge (4).
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May 01/98  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  56-41-21 Page 401 

C.  Remove floor panel (5) exposing wing center section pressure web structure (6) in which viewer tube (10) with viewer window (7) is installed.
NOTE:  Steps "A" through "C" are necessary only if the upper surface of the viewer window is to be cleaned.
D.  Apply a protective cover of cellulose acetate sheeting or equivalent, to the upper surface of the viewer window (7). Secure cover with masking tape.
4.  Remove Main Gear Downlock Viewer
A.  Remove the eight hex head bolts (2, figure 401) and flat washers (1) from retainer ring (9).
B.  Remove viewer window (7) with rubber seal (8) from retainer ring (9).
C.  Strip rubber seal (8) from edge of window (7) only if a new seal is to be installed.
CAUTION:  IF THE WINDOW IS TO BE REINSTALLED, A PROTECTIVE COVERING OF CELLULOSE ACETATE SHEETING OR EQUIVALENT, SHOULD BE APPLIED TO BOTH UPPER AND LOWER SURFACES OF THE WINDOW TO PREVENT DAMAGE DURING HANDLING. IF A NEW SEAL IS TO BE INSTALLED, DO NOT COVER THE AREA WHICH WILL CONTACT THE RUBBER SEAL AROUND THE PERIPHERY OF THE GLASS WINDOW.
NOTE:  Steps "A" through "C" are necessary only if a replacement window or window seal is to be installed.
D.  Working from below the viewer installation, apply protective covers of cellulose acetate sheeting or equivalent, to accessible surfaces of the two mirrors (17). Secure covers with masking tape.
E.  Remove the eight pan head screws (16) and flat washers (15) attaching bottom plate (13) to ring on lower end of viewer tube (10).
F.  Remove bottom plate (13) with attached mirror brackets (12) and mirrors (17) as an assembly from the lower end of viewer tube (10).
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56-41-21 Page 402  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 15/67 

G.  If new mirrors, mirror retainers, or sponge rubber backing is to be installed, remove six pan head screws (21) and flat washers (20) from the mirror brackets (12).
H.  Remove mirror retainer (19), sponge rubber backing (18) and mirror (17) from mirror bracket (12).
NOTE:  Steps "G" and "H" are necessary only if replacement mirrors, new rubber backing or mirror retainer is to be installed.
5.  Prepare Main Gear Downlock Viewer for Installation
A.  If a window seal is being installed, clean faying surfaces of new rubber seal (8, figure 401) and viewer window (7) with naphtha applied with a clean, oil-free cheesecloth or other absorbent material
　
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