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CHAPTER 52
Doors
CH-SC-SU Subject Page Effectivity
52-71-00 DOORS - DOOR WARNING SYSTEM - EMERGENCY EXIT DOOR -
FUNCTIONAL DESCRIPTION
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52-CONTENTS
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
CHAPTER 52
Doors
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The doors are movable units that give access to the airplane
compartments.
General Description
These are the types of doors on the airplane:
* Forward and aft entry doors
* Forward and aft galley service doors
* Emergency exit doors
* Cargo doors
* Miscellaneous access doors.
A door warning system shows the crew that pressure bearing
doors are closed and properly latched before flight.
Pressure doors have silicon rubber seals. The seals do these
things:
* Seal air and light leaks
* Act as acoustic and thermal barriers
* Supply aerodynamic smoothness.
See the main gear and doors section for more information on
the landing gear doors. (SECTION 32-10)
Location
The entry doors are on the left side of the airplane.
The galley service doors are on the right side of the airplane.
The emergency exit doors are above the wings on both sides of
the airplane.
The cargo doors are on the right side of the airplane.
The miscellaneous access doors are near the systems they
serve.
Training Information Point
You can open and close entry, galley service, and cargo doors
in winds up to 40 knots without structural damage. You can let
these doors stay latched open in winds up to 65 knots without
structural damage.
If a door is open for a long time, a protective cover should be put
over the door frame. This prevents bad weather damage to the
airplane.
When an entry and galley service doors are open and not used,
a safety strap must be attached in the doorway.
DOORS - INTRODUCTION
EFFECTIVITY
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DOORS - INTRODUCTION
DOORS - INTRODUCTION
EFFECTIVITY
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EFFECTIVITY
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DOORS - INTRODUCTION
EFFECTIVITY
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Purpose
The door seals do these things:
* Stop air leaks (pressure seals)
* Stop light transmission (light seals)
* Reduce noise transmission (acoustic seals)
* Reduce thermal transmission (thermal seals)
* Improve aerodynamic smoothness (aero seals).
General Description
Door seals are flexible materials made of cloth and glass fiber
reinforced silicon rubber. The seals are made in many forms to
meet the requirements of their function. These are the common
types of seal shapes:
* Bulb-type seals
* Diaphragm seals
* Flap-type seals (Blade seals)
* Multiform seals (combination of forms).
Door seals are held in place by one or more of these things:
* Adhesive compounds (fay surfaces and edges)
* Screws (with or without backing plates)
* Flanges and channels (plain or rod-and-socket).
Location
Door seals are used where it is necessary to cover the spaces
on or around a door or panel. These are the typical locations of
door seals:
* Over door and panel hinges (diaphragm type)
* Around door and panel edges (flap, blade, and bulb types)
* Around door and panel frames (flap, blade, and bulb types).
　
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