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 of the target is operated, the sensor transmits a signal to the ECAM system. It shows on the lower ECAM control panel that the door is opened.
 There is a red warning light CABIN PRESSURE near the door window. It flashes on the ground if a person tries to open the door from the inner or outer side when:
 - the door is in the DISARMED MODE, - there is a difference between the inside and outside pressure and - one engine is off.
R  4. Component Description_____________________ 
R R R R R R R R R R  The main components of each emergency exit door (referred to as door) are: (Ref. Fig. 003, 004) - the Door Structure, - the Door Seal, - the Lining and Insulation, - the Door Suspension, - the Door Damper and Emergency Operation Cylinder, - the Locking Mechanism, - the Escape Slide-Release Mechanism, - the Door Stop and Roller Fittings.
 A. Door Structure
 (Ref. Fig. 005, 006) The primary structural elements of each door are: - the chemically milled outer skin, - the frame segments, - the edge members, - the upper and lower members - the curved members, - the horizontal beams, - the window frame.
 These formed and milled components are made of aluminum alloy. They are riveted together to give the door its rigidity. In the outer skin panel there are cut-outs for the door window and the outboard handle. A
 pressure-tight handle housing covers the handle cut-out to the inner side of the door. The horizontal beams have some cut-outs and holes to
 decrease the weight of the door. The holes at the lowest collection points of the horizontal beams allow liquids to flow from the internal door structure.
 The door has two hoisting points integrated in the frame segments above the door center. The hoisting points have threaded inserts to receive the hoist lugs.

 

 Structure of the 73" Emergency Exit Door
 Figure 005
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 Structure of the 60" Emergency Exit Doors
 Figure 006
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 To prevent the corrosion of the primary door structure, all components have a surface protection and are installed with sealing compound. The surface protection of the structure components is chromic acid anodizing plus epoxy primer and polyurethane top coat. On the inner side of the door there is a water repellant agent.
 B. Door Seal
R The door seal is an extruded rubber seal profile with equally-spaced pressurization holes. Retainers attached with bolts and nuts around the inner edge of the outer skin hold the door seal in the position. When the door is closed, the door seal touches with the sealing section of the fuselage door frame. When the cabin is pressurized, the door seal inflates and makes the door pressure-tight.
 C. Lining and Insulation
R Differently formed insulation packets and panels are installed in the interspaces of the primary structure for sound and thermal protection. They are attached with VELCRO tapes on the inner face of the outer skin. The insulation panels are made of polyethylene foam. They are only installed in the area where the movable components of the door mechanism are located.
 The insulation packets are made of glasswool blankets which are covered with a wrapped foil. An additional insulation mat made of polyethylene foam is attached with VELCRO tapes on the inner skin of the door.
 The door lining which is in several sections covers the inner side of the door. It has different cut-outs for the subsequent components:
 -
the interior control handle of the locking mechanism,

 -
the door window and the warning indicator lights,

 -
the LOCKING/UNLOCKING indicator,

 -
the DISARMED/ARMED indicator.

 D. Door Suspension
 (Ref. Fig. 007)
 The primary components of the door suspension are:

 -
the support arm,

 -
the upper and lower guide arms,

 -
the adjustable door buffer,

 -
the door stay mechanism.

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 Door Suspension
 Figure 007
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 The support arm and the guide arms hold the door in balance and keep it parallel to the fuselage when it moves. The support arm is a cast alloy box section with integral connection forks. It is linked to the fuselage hinge fittings and to the link lever of the door locking mechanism to connect the door with the fuselage. The guide arms are installed between the fuselage attachment fitting and the guide fitting mounted on the door.
　
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