Jay Beckman ) wrote:

The Bendix/King KX 155As in the C172SPs I trained in and am now renting will
(according to the Cessna Pilot Course textbook...) cut off the TX if the mic
has been keyed for longer than 33 seconds. Then the active frequency will
start blinking confirming you've been cut off. I've not had to test this
under fire yet...hope I don't have to.

Provide a PIREP or file a flight plan in the air and you will
inadvertently test the cut-off feature of this audio panel.

During a PIREP or flight plan, I purposely pause to recycle the push-
to-talk switch. This prevents the panel from activating that safety
feature and cutting me off mid-sentence.

--
Peter