General.

CFR · 2024-01-01 · US · Title 14

(a) Unless otherwise prescribed, airplanes must meet the applicable performance requirements of this subpart for ambient atmospheric conditions and still air. (b) The performance, as affected by engine power or thrust, must be based on the following relative humidities; (1) For turbine engine powered airplanes, a relative humidity of— (i) 80 percent, at and below standard temperatures; and (ii) 34 percent, at and above standard temperatures plus 50 °F. (2) For reciprocating engine powered airplanes, a relative humidity of 80 percent in a standard atmosphere. Engine power corrections for vapor pressure must be made in accordance with the following table: (c) The performance must correspond to the propulsive thrust available under the particular ambient atmospheric conditions, the particular flight condition, and the relative humidity specified in paragraph (b) of this section. The available propulsive thrust must correspond to engine power or thrust, not exceeding the approved power or thrust less— (1) Installation losses; and (2) The power or equivalent thrust absorbed by the accessories and services appropriate to the particular ambient atmospheric conditions and the particular flight condition. (d) Unless otherwise prescribed, the applicant must select the takeoff, en route, approach, and landing configurations for the airplane. (e) The airplane configurations may vary with weight, altitude, and temperature, to the extent they are compatible with the operating procedures re

official document · source cfr-2024 · id 14:§ 25.101