Emergency AD
Emergency ADs are issued when immediate corrective action is required.
Emergency ADs are distributed to the registered owners of the affected product
by telegram or priority mail and are effective upon receipt.
Emergency ADs are published in the Federal Register as soon as possible after
initial distribution.
ADs issued to other than aircraft
ADs may be issued which apply to engines, propellers, or appliances installed on
multiple makes or models of aircraft.
When the product can be identified as being installed on a specific make or
model aircraft, AD distribution is made to registered owners of those aircraft.
However, there are times when such a determination cannot be made, and
direct distribution to the registered owners is impossible.