14 CFR 49.1 – Applicability
(a) This part applies to the recording of certain conveyances affecting title to, or any interest in—
(1) Any aircraft registered under 49 U.S.C. §§ 44101–44104;
(2) Any specifically identified aircraft engine of 550 or more rated takeoff horsepower, or the equivalent of that horsepower;
(3) Any specifically identified aircraft propeller able to absorb 750 or more rated takeoff shaft horsepower; and
(4) Any aircraft engine, propeller, or appliance maintained by or for an air carrier certificated under 49 U.S.C. § 44705, for installation or use in an aircraft, aircraft engine, or propeller, or any spare part, maintained at a designated location or locations by or for such an air carrier.
(b) Subpart B of this part governs, where applicable by its terms, conveyances subject to this part.