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 When the locking handle is in line with the cargo door contour, the target operates the proximity switch 34WV. This causes the visual warning in the cockpit to go off (Ref. 52-71-00). In this position, the hook of the flap mechanism safeties the locking handle against movement.
R **ON A/C 106-149, 221-299, 301-399, 401-499,
 When the door handle is moved down and pushed inboard so that it is in line with the cargo door contour, the subsequent occurs:
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the door handle disengages from the Maltese-cross latch and engages with the Maltese-cross lock. This causes the control rod to operate and the latching shaft turns so that the safety cams move into the recess of the latching hooks.

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the handle spring keeps the door handle in the overcenter position,

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the vent door lever moves down and operates the connection rod. The sequence shaft transmits the movement through the input bellcrank and the drift pin bellcrank to the horizontal linkages. They move the drift pins which extend into the pockets of the fuselage frame.

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the vent door bellcrank operates the vent door rod which closes the vent door.

　
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