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DOORS - INTRODUCTION
DOORS - INTRODUCTION
EFFECTIVITY
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DOORS - INTRODUCTION
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).
Functional Description
Door seals are flexible materials that fill the spaces between
mechanical parts. They are resilient materials that work by
elastic deformation.
Training Information Point
Liquid soap is a good, nonstaining lubricant for most seals. A
lubricant can be useful for these reasons:
* To make installation easy
* To extend the service life of the seal.
A door that is noisy or makes a whistle sound may have a faulty
seal.
You can repair a seal if there is not too much damage.
DOORS - STANDARD DOOR SEALS
EFFECTIVITY
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DOORS - STANDARD DOOR SEALS
DOORS - STANDARD DOOR SEALS
EFFECTIVITY
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Location
The forward entry door is on the left side of the upper, forward
fuselage.
General Description
The forward entry door is the largest passenger entry door on
the airplane.
The door is a plug-type door. The door has these parts:
* Center door assembly
* Upper gate
* Lower gate.
A liner covers the interior surface of the door.
The center door assembly has hard points at the bottom for the
emergency escape slide installation.
The center door assembly has a window.
Door Control Mechanisms
You can open and close the door from the interior or exterior of
the airplane. You operate the door manually. Unlatch the door
with the control handle.
When you turn the handle in the OPEN direction, internal
mechanisms do these things:
* Disengage the door roller latches
* Fold the door gates inward
* Tilt the door hinge edge inward to the cocked position.
Then push the door through the door frame until it is fully open.
Use the assist handles for this operation.
A lock mechanism in the upper hinge locks the door in the fully
open position.
To close the door, first release the hinge lock and then do the
open operations in reverse order.
A guide pin on the door and a guide pin track on the door frame
align the door in the door frame as it closes.
Door Support
When the airplane is unpressurized, the hinges support the
door.
When the airplane is pressurized, cabin pressure pushes the
door slightly outboard. This causes these things to occur:
* Door seals compress
* Door stop pins contact frame stop fittings. This transmits the
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