[Code of Federal Regulations] [Title 14, Volume 1] [Revised as of January 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 14CFR29.51] [Page 653] TITLE 14--AERONAUTICS AND SPACE CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 29_AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY ROTORCRAFT--Table of Contents Subpart B_Flight Sec. 29.51 Takeoff data: general. (a) The takeoff data required by Sec. Sec. 29.53, 29.55, 29.59, 29.60, 29.61, 29.62, 29.63, and 29.67 must be determined-- (1) At each weight, altitude, and temperature selected by the applicant; and (2) With the operating engines within approved operating limitations. (b) Takeoff data must-- (1) Be determined on a smooth, dry, hard surface; and (2) Be corrected to assume a level takeoff surface. (c) No takeoff made to determine the data required by this section may require exceptional piloting skill or alertness, or exceptionally favorable conditions. [Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as amended by Amdt. 29-39, 61 FR 21899, May 10, 1996]