14 CFR § 65.92 - Inspection authorization: Duration.
(a) Each inspection authorization expires on March 31 of each odd-numbered year. However, the holder may exercise the privileges of that authorization only while he holds a currently effective mechanic certificate with both a currently effective airframe rating and a currently effective powerplant rating.
(b) An inspection authorization ceases to be effective whenever any of the following occurs:
(1) The authorization is surrendered, suspended, or revoked.
(2) The holder no longer has a fixed base of operation.
(3) The holder no longer has the equipment, facilities, and inspection data required by § 65.91(c) (3) and (4) for issuance of his authorization.
(c) The holder of an inspection authorization that is suspended or revoked shall, upon the Administrator's request, return it to the Administrator.