Door Suspension and Balance Mechanism
 Figure 003

R 1EFF : 001-003, 051-054, 1 52-33-00Page 10 1 1 May 01/05 1 1 1CES 1R **ON A/C 004-049, 055-099, 101-149, 221-221, 224-224, 228-228,

 (Ref. Fig. 003A)
R **ON A/C 001-049, 051-099, 101-149, 221-221, 224-224, 228-228,
 The suspension of the Bulk door includes two hinge fittings and two hinge arms with their dampers. The hinge fittings are riveted to the vertical spars of the door structure. The hinge arms are attached to the hinge fittings and connected to the fuselage door frame. These connections are made with pivot pins which are safetied in position with a screw and a tab washer. The dampers decrease the shockloads of the hinge fittings which can occur during the pressurization of the fuselage.
 C. Lining and Insulation
 Special insulation panels with different thicknesses are installed in the gaps between the horizontal beams and the vertical spars (referred to as interspaces) for the heat protection. They are made of polyethylene foam and attached with their self-adhesive sides on the inner face of the outer skin. The thinner panels are only in the inter sp aces where the movable components of the locking and balance mechanism are installed.
 A special lining for the fire protection is installed on the inner skin of th e Bulk door. This lining is in three parts which are attached with VELCRO tapes on their positions.
 D. Door Seal
 The door seal, made of special rubber hose, is installed in the retainers, riveted on the door structure. When the Bulk door is closed, the door seal is pressed on a bulb section of the fuselage door frame. The cabin pressure inflates the door seal to make a pressure-tight interface.
R **ON A/C 001-003, 051-054,
 E. Locking Mechanism
 (Ref. Fig. 004)

 The locking mechanism is installed in the lower section of the Bulk door. Its primary components are the door handle mechanism, the locking shaft and the latch assy.
R 1EFF : 001-049, 051-099, 101-149, 221-221, 1 52-33-00Page 11 1224-224, 228-228, 1May 01/05 1 1 1CES 1

 Door Suspension and Balance Mechanism
 Figure 003A

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 Locking Mechanism Figure 004 
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 The door handle mechanism has the lever assy, the internal and external door handles which are installed in the housing. The external door handle contains a lock mechanism which keeps the handle in the recess of its housing. The spring moves the external door handle from the recess if the mechanism is released. The internal actuator pin of the extended handle engages with the slot of the lever assy. Thus, the external door handle can operate the locking shaft only when it is out of the recess. The internal door handle is connected directly to the lever assy, but opposite to the external door handle.
 A spring unit is installed between the lever assy and the door structure. It makes sure that the lever assy is always in the overcenter position.
 The locking shaft includes the torque tubes, the shaft lever, the main lever and the barrel locks. The two barrel locks engage with the latch spigots to lock the Bulk door in the closed position. The latch spigots are on the door frame of the fuselage. The push-rod connects the lever assy with the main lever to transmit the movement of the door handles to the locking shaft.
 To safety the Bulk door in the open position, the hook of the latch assy engages with the hook arrester. The spring unit connects the hook with the shaft lever so that the movement of the locking shaft operates the hook.
 The two barrel locks engage with the latch spigots and hold the Bulk door in the closed position. The latch spigots are attached to the door frame of the fuselage. A spring strut is installed between the lever assy and the door structure. It makes sure that the lever assy is always in the overcenter position.
R **ON A/C 004-049, 055-099, 101-105,
 E. Locking Mechanism
 (Ref. Fig. 004A)

 The locking mechanism is installed in the lower section of the Bulk door. Its primary components are the door handle mechanism, the locking shaft and the latch assy.
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 Locking Mechanism Figure 004A 
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 The door handle mechanism has the lever assy and external door handles which are installed in the handle housing. The external door handle contains a lock mechanism which keeps the handle in the recess of its housing. The spring moves the external door handle from the recess if the mechanism is released. The internal actuator pin of the extended handle engages with the slot of the lever assy. Thus, the external door handle can operate the locking shaft only when it is out of the recess.
　
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