mechanism blocks each latching unit in its latched position. The red marks show that the latching units are not blocked and satisfactory.
When the cargo door is locked, the door seal makes the related cargo compartment pressure-tight. To balance the difference in pressure on the ground and in the cargo compartment, there is a vent door in the cargo door. This spring-loaded vent door opens inboard and remains in this position until the cargo door is correctly locked.
The interlock mechanism blocks the latching mechanism in the unlatched position when the cargo door is not closed. Then the door handle is not movable and the latching hooks stay in the lifted position. The door actuators use hydraulic pressure from the door hydraulic system to open and close the cargo doors. They have an internal locking mechanism to keep the cargo door safely in the fully open position.
The proximity switches of the door warning system (circuit WV) monitor the closed and locked condition of the cargo door. They send a signal to the Electronic Centralized Aircraft Monitoring (ECAM) system when a cargo door is not locked. Then the master caution lights in the cockpit come on and the data is shown on the DOOR page of the ECAM display.
The external indications which show that a cargo door is not correctly locked and latched are:
- the vent door stays in open position, - the door handle stays away from the outer contour of the cargo door, - the red mark of each lock cams is in view through the indication windows.
R **ON A/C 051-052,
R R R R The locking hooks of the manually operated locking mechanism keep each cargo door in the closed position. The cams of the safety mechanism engage with the locking hooks when the cargo doors are correctly locked.
R R R R R To show this condition there are indication windows in the access panel of each cargo door. The green mark on each safety cam shows that the safety mechanism locks each locking unit in its latched position. The red marks show that the locking units are not locked and satisfactory.
R R R R R R When the cargo doors are locked, the door seal makes the related cargo compartment pressure-tight. To balance the difference in pressure on the ground and in the cargo compartments, there is a vent door in each cargo door. This spring-loaded vent door opens inboard and remains in this position until the cargo door is correctly locked.
R 1EFF : ALL 1 52-31-00Page 10 1 1 May 01/05 1 1 1CES 1 The interlock mechanism blocks the locking mechanism in the unlocked position when the cargo door is not closed. Then the locking handle is not movable and the locking hooks stay in the lifted position. The door actuators use hydraulic pressure from the door hydraulic system to open and close the cargo doors. They have an internal locking mechanism to keep the cargo door safely in the fully open position.
The proximity switches of the door warning system (circuit WV) monitor the closed and locked condition of the cargo door. They send a signal to the Electronic Centralized Aircraft Monitoring (ECAM) system when a cargo door is not locked. Then the master caution lights in the cockpit come on and the data is shown on the DOOR page of the ECAM display.
The external indications which show that a cargo door is not correctly locked and latched are:
-
the vent door stays in open position,
-
the locking handle stays away from the outer contour of the cargo door,
-
the red mark of each safety cam is in view through the indication windows.
**ON A/C ALL
4. Component Description
_____________________
R **ON A/C 001-049, 053-099, 101-149, 151-199, 201-299, 301-399, 401-499,
A. Door Structure
The primary structure has vertical and horizontal edge members, fairings, longitudinal beams, frames, and an inner and outer skin. These formed and milled components are made from aluminum alloy and are riveted together with a sealant compound to make a corrosion-resistant cargo door. The sealant compound between the skin and the edge members makes sure that the primary structure is pressure-tight.
To prevent corrosion, all components have a surface protection of chromic acid anodizing plus epoxy primer and a polyurethane top coat.
The lower, milled ends of each door frame have provisions for the installation of the locking and latching mechanism. An access panel covers the lower part of the cargo door.
The outer skin has cutouts for the vent door and for the installation of the three hoisting lugs.
1EFF : ALL 1 52-31-00Page 11 1 1 Aug 01/05 1 1 1CES 1
The attachment fittings of the door actuators are part of the door frames
FR25A and FR26A.
For the attachment of the door seal, the related retainers are riveted at
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