§3.20 Airplane categories .

(a) For the purpose of certification under this part, airplanes are divided upon the basis of their intended operation into the following categories: (1) Normal suffix N . Airplanes in this category are intended for nonacrobatic, nonscheduled passenger, and nonscheduled cargo operation. (2) Utility suffix U . Airplanes in this category are intended for normal operations and limited acrobatic maneuvers. These airplanes are not suited for use in snap or inverted maneuvers. NOTE: The following interpretation of paragraph (a) (2) was issued May 15, 1947, 12 F.R. 3434: The phrase “limited acrobatic maneuvers” as used in § 3.6 (now § 3.20) is interpreted to include steep turns, spins, stalls (except whip stalls), lazy eights, and chandelles. (3) Acrobatic suffix A . Airplanes in this category will have no specific restrictions as to type of maneuver permitted unless the necessity therefor is disclosed by the required flight tests. (b) An airplane may be certificated under the requirements of a particular category, or in more than one category, provided that all of the requirements of each such category are met. Sections of this part which apply to only one or more, but not all, categories are identified in this part by the appropriate suffixes added to the section number, as indicated in paragraph (a) of this section. All sections not identified by a suffix are applicable to all categories except as otherwise specified.] CHANGES