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(2) qualify by showing compliance with either the performance requirements contained in §§ 04a.75-T through 04a.7533-T or the requirements contained in Part 04b, and when so qualified shall meet the requirements of § 61.712 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 § 61.712 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)

-18519 Part 40 last printed July 10, 1946