(2) Latching Mechanism with Interlock Mechanism
The latching mechanism which is installed in the lower part of the cargo door includes the subsequent components:
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the latching shaft which has six shaft levers, the control lever, the interlock cam and the link lever,
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the six latching units which have a latching hook, a bellcrank, a bellcrank lever and a connection rod,
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the interlock mechanism which includes the interlock lever with the stop bolt, the connection rod and the spring unit.
The Maltese-cross latch transmits the movement of the door handle (from 65 degree to 128 degree) via the connection rod to the latching shaft. The shaft levers then operate the latching units which move their latching hooks into the latched or released position.
The interlock mechanism prevents the operation of the door handle when the cargo door is still opened. The spring unit moves the interlock lever to the blocked position so that its stop bolt touches the interlock cam.
**ON A/C 051-052,
(1) Locking Handle with Flap Mechanism The locking handle is installed between FR56 and FR55 . To lock the cargo door correctly, the locking handle must be:
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in the horizontal position (LOCKED position),
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in the recess of the handle flap.
Parts of the locking handle are the lever mechanism, the handle bearing and the handle spring. The lever mechanism operates the safety mechanism when the locking handle is pulled from the recess. The limit lever of the lever mechanism stops the travel of the locking lever.
The handle bearing operates the locking mechanism when the locking handle is turned to the UNLOCKED position.
The handle spring keeps the lever mechanism in the overcenter position when the locking handle is in the recess. In this position, the target on the end of the locking handle operates the proximity sensor 34WV.
R 1EFF : ALL 1 52-32-00Page 52 1 1 Aug 01/05 1 1 1CES 1 The flap mechanism includes the spring-loaded handle flap and the linkage with the related hook. The inboard movement of the handle flap operates the linkage to disengage the hook from the locking handle. The hook safeties the locking handle when it is pushed in the recess of the handle flap.
(2) Locking Mechanism with Interlock Mechanism
The locking mechanism which is installed in the lower part of the cargo door includes the subsequent components:
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the locking shaft which has six shaft levers, the control lever, the interlock cam and the deflection unit with the related link rod,
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the six locking units which have a locking hook, a bellcrank, a bellcrank lever and a spring unit,
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the interlock mechanism which includes the interlock lever with the stop bolt, the connection rod and the spring unit.
The link rod connects the deflection unit with the handle bearing to transmit the movement of the locking handle to the locking shaft. The shaft levers operate then the locking units which move their locking hooks into the locked or released position. The compressed spring unit of each locking unit makes sure that the locked hooks stay in the overcenter position.
The interlock mechanism prevents the operation of the locking handle when the cargo door is still opened. The spring unit moves the interlock lever to the blocked position so that its stop bolt touches the interlock cam.
**ON A/C 001-049, 053-099, 101-105, 151-199, 201-220,
(3) Locking Mechanism with Vent Door Mechanism
The locking mechanism is installed parallel to and below the latching mechanism in the lower part of the cargo door. The primary task of this mechanism is to tell the operator that the latching mechanism is correctly latched. The locking mechanism includes the subsequent components:
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the locking shaft which has a link rod, six lock cams with a red and green mark, a drift pin lever and a vent door lever,
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the vent door mechanism which opens and closes the vent door,
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the linkage mechanism which includes the control rod, the serrated shaft and the gas spring.
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 52-32-00Page 53 1201-220, 1Aug 01/05 1 1 1CES 1 The control rod transmits the movement of the door handle (from 0 degree to 65 degree ) via the Maltese-cross lock to the locking shaft. The lock cams then engage with, or disengage from, the recess of the latching hooks. The engaged lock cams prevent the operation of the latching hooks. Then, the operator can see the green mark on each safety cam through the indication windows of the access panel. When the operator can see a red mark in the indication windows, then the lock cams are disengaged from the latching hook.
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