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begin to contact with the lock pin, the dog bone will be in full contact with its stop to complete the movement of the drag leg assembly into the down and locked position, and the downlock hooks will move up and over the lock pin to complete the downlock.
After the hydraulic system turns off, the hydraulic pressure bleeds off. The hydraulic actuator will no longer have the pressure (force) to push the dog bone. The link assembly that connects the dog bone to the downlock hooks has a spring. Due to this spring, the dog bone can move away from its stop as the hydraulic pressure bleeds off. This condition is normal. In this condition, the downlock hooks will remain over the lock pins and keep the drag leg safely in the locked position.
In summary, the dog bone can and does, at times, move away from the stop; as long as the downlock hooks are over the D bolt, it can be considered down and locked. The illustration below shows this condition.
From King Air Communiqué 2016-07
Issued: June 2016
ATA 46 – XM Weather TAF data on Pro Line 21 King Airs with XM Receiver part number 822-2031-002
Beginning in early 2016, Rockwell Collins began receiving reports of intermittent reception of Terminal Area Forecast (TAF) data through the XM weather receiver installed in Pro Line 21 aircraft. This data
JULY 2016
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KING AIR MAGAZINE • 39