{"data":{"id":"us/14-cfr-27.65","jurisdiction":"us","citation":"14 CFR 27.65","heading":"Climb: all engines operating.","body":"(a) For rotorcraft other than helicopters—\n(1) The steady rate of climb, at VY, must be determined—\n(i) With maximum continuous power on each engine;\n(ii) With the landing gear retracted; and\n(iii) For the weights, altitudes, and temperatures for which certification is requested; and\n(2) The climb gradient, at the rate of climb determined in accordance with paragraph (a)(1) of this section, must be either—\n(i) At least 1:10 if the horizontal distance required to take off and climb over a 50-foot obstacle is determined for each weight, altitude, and temperature within the range for which certification is requested; or\n(ii) At least 1:6 under standard sea level conditions.\n(b) Each helicopter must meet the following requirements:\n(1) VY must be determined—\n(i) For standard sea level conditions;\n(ii) At maximum weight; and\n(iii) With maximum continuous power on each engine.\n(2) The steady rate of climb must be determined—\n(i) At the climb speed selected by the applicant at or below VNE;\n(ii) Within the range from sea level up to the maximum altitude for which certification is requested;\n(iii) For the weights and temperatures that correspond to the altitude range set forth in paragraph (b)(2)(ii) of this section and for which certification is requested; and\n(iv) With maximum continuous power on each engine.","path":["Title 14—Aeronautics and Space","CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER C—AIRCRAFT","PART 27—AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT","Subpart B—Flight"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-14.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:20Z","sha256":"4094811191cb3465ff0dfaab81ebfdb5b2becf74dee3cdf23c42169e4ed00b15","source_id":"us-cfr","stale":true,"prev":"us/14-cfr-27.51","next":"us/14-cfr-27.67"},"notice":"GroundRules: Original legal text. Not legal advice."}