For the purpose of this part:

Aviation Safety Inspector means a pilot employed by the FAA to conduct operations of a powered-lift for the purpose of establishing a type rating in that particular powered-lift under part 21 of this chapter, as appropriate.

Extended over-water operation means a powered-lift operation over water at a horizontal distance of more than 50 nautical miles from the nearest shoreline and more than 50 nautical miles from an off-shore heliport structure under part 91 or 135 of this chapter.

FAA test pilot means a pilot employed by the FAA to conduct operations of a powered-lift for the purpose of FAA examination or inspection of a type design for which an application for type certification has been submitted under part 21 of this chapter.

Heliport means an area of land, water, or structure used or intended to be used for the landing and takeoff of helicopters and powered-lift.

Instructor pilot means a pilot employed or used by a manufacturer of a powered-lift to conduct operations of the powered-lift for the purpose of developing a proposed training curriculum and providing crew training.

Manufacturer means any person who holds, or is an applicant for, a type or production certificate for an aircraft. An amateur builder under § 21.191(g) of this chapter, builder of a kit aircraft under § 21.191(h) of this chapter, or the holder of a restricted category type certificate are not considered manufacturers for the purpose of this part.

Test pilot means a pilot employed or used by a manufacturer of a powered-lift to conduct operations of the powered-lift for the purpose of research and development and showing compliance with this chapter.

Vertical-lift flight mode means a mode of flight where a powered-lift:

(1) Is in a configuration that allows vertical takeoff, vertical landing, and low-speed flight; and

(2) Depends principally on engine-driven lift devices or engine thrust for lift.

Wing-borne flight mode means a mode of flight where a powered-lift is not operating in the vertical-lift flight mode as defined and depends exclusively or partially on nonrotating airfoil(s) for lift during takeoff, landing, or horizontal flight.