AC 21-37

Advisory circular · Primary Category Aircraft

Approved
June 14, 1994
Last reviewed
March 22, 2017
Family
AC 21-37 · 1 version
14 CFR parts
21

Guidance, not mandatory unless a rule or AD requires it. DRS record last changed October 23, 2026.

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b. Section 91.325 (b) permits a person other than the pilotowner to operate a primary category aircraft maintained by the pilot-owner as long as the pilot-owner is not compensated for use of the aircraft. For example, this allows a pilot-owner to lend the aircraft to a pilot friend or to demonstrate the aircraft to a prospective buyer. It also allows a pilot-owner whose certificate is not current to regain currency using a certificated flight instructor in the pilot-owner's selfmaintained primary category aircraft.

The 12-month annual inspection required by § 91.409(a) is required for primary category aircraft that have been issued an airworthiness certificate under § 21.184. In addition, the 100-hour inspection required by § 91.409 (b) is required if the aircraft is used for rental or flight instruction. Pilot-owners that do not also hold airframe and powerplant mechanic ratings and/or inspection authorizations are not authorized to perform the inspections.

23. FAR Part 147 - Aviation Maintenance Technician Schools.

Aviation maintenance technician schools may conduct training programs for primary category preventive maintenance programs.

Training programs must be specific to aircraft makes and models.

The school submits its training program (s) for FAA approval to the local Flight Standards District office, not to the ACO.

school also may issue certificates of competency to persons who successfully complete the training programs. A certificate of competency must specify the aircraft make and model to which the certificate applies.

JOHN K. MCGRATH Manager, Aircraft Engineering Division Par 22 13