Window No. 1........................................................................................................... 56-11-11 Removal/Installation Inspection/Check
Window No. 3........................................................................................................... 56-11-21 Removal/Installation Inspection/Check Approved Repairs
Windows No. 4 and 5............................................................................................... 56-11-31 Removal/Installation Inspection/Check Subject Subject No.
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Feb 15/79  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Contents 56 Page 1 

SLIDING CONTROL CABIN WINDOWS.................................................................... 56-12-0

Description and Operation
Window No. 2 (Pilots' Sliding Windows)
Window No. 2 Seals and Sealants
Window No. 2 (Pilots' Sliding Window) Emergency Exit 

Release Mechanism
Window No. 2 (Sliding Window) .............................................................................. 56-12-11 Trouble Shooting Removal/Installation Adjustment/Test Inspection/Check Approved Repairs
CABIN
PASSENGER CABIN WINDOWS .............................................................................. 56-21-0 Description and Operation Servicing Removal/Installation Inspection/Check Approved Repairs
Passenger Cabin Windows Plate (Plug).................................................................. 56-21-11 Removal/Installation
EMERGENCY EXIT HATCH WINDOW...................................................................... 56-22-0 Description and Operation Removal/Installation Inspection/Check
DOOR
DOOR-MOUNTED WINDOWS................................................................................... 56-31-0 Description and Operation Removal/Installation Inspection/Check Approved Repairs
INSPECTION AND OBSERVATION
VIEWERS AND OBSERVATION WINDOWS............................................................. 56-41-0

Description and Operation
APU Fire Extinguisher Bottle Window
Main Gear Downlock Viewer Window
Nose Gear Downlock Viewer Window

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Contents 56 Page 2  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 20/89 

Subject Subject No.
Main Gear Downlock Viewer Window...................................................................... 56-41-21 Removal/Installation Inspection/Check
Nose Gear Downlock Viewer Window ..................................................................... 56-41-31 Removal/Installation Inspection/Check
APU Fire Extinguisher Bottle Window ..................................................................... 56-41-41 Removal/Installation
505 
Nov 15/67  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Contents 56 Page 3 

WINDOWS - DESCRIPTION AND OPERATION
1.  General
A.  The windows on the airplane are grouped as follows:
(1) 
 Flight Compartment Windows

(2) 
 Passenger Cabin Windows

(3) 
 Door-Mounted Windows

(4)  
Viewers and Observation Windows

B.  All windows, except the APU fire extinguisher bottle window, are designed to withstand cabin pressurization loads, and are designed with fail-safe features.
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Nov 15/77  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  56-00 Page 1 

FLIGHT COMPARTMENT WINDOWS - DESCRIPTION AND OPERATION
1. General
A.  There are ten windows symmetrically located around the flight compartment. They are named and numbered as shown on figure 1. Windows No. 1, 3, 4 and 5 are fixed in place. Window No. 2 is a sliding window, mounted on tracks, to permit ventilation and communication on the ground.
B.  The window seals which are used on the flight compartment windows consist of fixed window pressure seals, which are used on windows No. 1, 3, 4, and 5, and the sliding window pressure seals. The sliding window pressure seals are installed on windows No. 2. The primary purpose of the two types of pressure seals is to prevent cabin pressurization leakage around the windowpanes when the flight compartment is pressurized.
C.  The sealants that are used on the windows prevent moisture penetration, water entrapment, and provide aerodynamic flushness of the outer windowpane and the window frame. The pressure seals, sealants, and the other components used to seal each window in its frame are described in 56-11-0 and 56-12-0.

H29672
500  Flight Compartment Window Location 
Aug 15/67  Figure 1  56-10-0 
Page 1 
　
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