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(b) Aircraft certificated as a basic type prior to June 30, 1942, shall either:

(1) retain their present airworthiness certification status and shall be operated in accordance with such operating limitations as the Administrator finds will provide a safe relation between the performance of the aircraft and the dimensions of airports and terrain;
or

(2) Qualify by showing compliance with either the performance requirements contained in SS 04a. 75-T through 04a.7533-T, or the requirements contained in Part 04b, and when so qualified shall meet the requirements of SS 41.27 over each route to be flown: Provided, That should any model be so qualified all aircraft of any one operator of the same or related models shall be similarly qualified and operated.

(c) Aircraft used after December 31, 1953, shall comply with all of the requirements of Part 04b or the transport category requirements of Part 04a, and shall meet the requirements of SS 41.27 over each route to be flown.

[Secs. 205 (a), 601, 603, 604, 52 Stat. 984, 1007, 1009, 1010; 49 U.S.C. 425 (a)., 551, 552, 554]

By the Civil Aeronautics Board:

/s/ M.C. Mulligan

M.C. Mulligan 
Secretary

( S E A L )

-18520 Part 41 last printed May 1, 1946.