The hatch seal is a special lip-type seal with a reinforced lip edge. The hatch seal is made of silicone rubber reinforced with strong fabric. It is installed in the retaining channels around the hatch. When the emergency exit hatch is installed, the seal lip is in contact with the hatch frame. Thus, the emergency exit is pressure-tight, when closed.
C. Lining and Insulation
Differently formed insulation packets are installed between the components 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 packets are made of glasswool blankets which are covered with a wrapped foil.
A hatch lining, which is part of the cabin lining, is attached with screws to the inside framing to cover the primary structure. It has a cut-out for the cover flap to get access to the hatch control handle. Around the hatch lining there is a gap seal to decrease the possible pressure leaks.
D. Locking Mechanism
**ON A/C 001-049, 051-099, 101-149, 201-299,
(Ref. Fig. 004)
R **ON A/C 151-199, 401-499,
(Ref. Fig. 004A)
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
The primary components of the locking mechanism are the locking shaft unit and the hatch control handle. They are installed in the upper section of the emergency exit hatch.
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Locking Mechanism Figure 004
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Locking Mechanism Figure 004A
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The locking shaft unit includes the two locking hooks and the locking shaft. When the emergency exit hatch is correctly locked, the locking hooks engage in the upper roller fitting on the fuselage. A connection rod attaches the hatch control handle to the locking shaft unit. When the hatch control handle is released, the connection rod causes a movement of the locking shaft unit. The hatch control handle has two tension springs which retain the handle in the up position. Part of the hatch control handle are the pull lever and the flush panel which operates the locking mechanism. When the pull lever is set down, the flush panel still remains in the handle frame. The spring-loaded linkage then blocks the pull lever in its lower position. An outboard operation of the flush panel moves the pull lever down and operates the locking shaft unit.
E. Slide Release Mechanism
**ON A/C 001-049, 051-099, 101-149, 201-299,
(Ref. Fig. 005)
R **ON A/C 151-199, 401-499,
(Ref. Fig. 005A)
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
The slide release mechanism includes the guiding fitting, the spring and the latch pin. The guiding fitting is installed on the left or right edge curve of the hatch structure. A guide pin is installed in the guiding fitting and engages in the keyway of the latch pin. The spring pin locks the spring-loaded latch pin in its ARMED position if the extended latch pin is turned clockwise. If the latch pin is turned counterclockwise, the spring retracts the latch pin to its DISARMED position.
F. Roller Guide Assemblies
The roller guide assemblies include the subsequent components:
-
the hook brackets and their pivot fittings,
-
the lateral guide fittings,
-
the upper roller fittings.
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Slide Release Mechanism
Figure 005
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Slide Release Mechanism Figure 005A
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The hook brackets, attached on the hatch bottom beam, engage in their pivot fittings attached on the opening sill. Both components together put the emergency exit hatch in line with the fuselage during the installation.
A lateral guide fitting is attached on each vertical edge member of the emergency exit hatch. These fittings put the hatch in the center position during the installation. The upper roller fittings are mounted on the lintel of the fuselage. If the emergency exit hatch is locked, the locking hooks engage in the roller fittings.
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