The following ratings are issued under this subpart:
• (1) Airframe.
• (2) Powerplant.
A mechanic certificate with an aircraft or aircraft engine rating, or both,
that was issued before, and was valid on, June 15, 1952, is equal to a
mechanic certificate with an airframe or powerplant rating, or both, as
the case may be, and may be exchanged for such a corresponding
certificate and rating or ratings.