CS 25.101 General

• ED Decision 2016/010/R found in: CS-25 Amdt 27 - Large Aeroplanes (Jan 2023)

CS 25.101 General ED Decision 2016/010/R (See [AMC 25.101](#_DxCrossRefBm1709820729)) (a) Unless otherwise prescribed, aeroplanes 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) 80%, at and below standard temperatures; and (2) 34%, at and above standard temperatures plus 28°C (50°F). Between these two temperatures, the relative humidity must vary linearly. (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 sub-paragraph (b) of this paragraph. 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. (See [AMCs No 1](#_DxCrossRefBm1709820728) and [No 2 to CS 25.101(c)](#_DxCrossRefBm1709820727).) (d) Unless otherwise prescribed, the applicant must select the take-off, en-route, approach, and landing configuration for the aeroplane. (e) The aeroplane configurations may vary with weight, altitude, and temperature, to the extent they are compatible with the operating procedures required by sub-paragraph (f) of this paragraph. (f) Unless otherwise prescribed, in determining the accelerate-stop distances, take-off flight paths, take-off distances, and landing distances, changes in the aeroplane’s configuration, speed, power, and thrust, must be made in accordance with procedures established by the applicant for operation in service. (g) Procedures for the execution of balked landings and missed approaches associated with the conditions prescribed in [CS 25.119](#_DxCrossRefBm1709820701) and [25.121(d)](#_DxCrossRefBm1709820672) must be established. (See AMC 25.101(g)) (h) The procedures established under sub-paragraphs (f) and (g) of this paragraph must – (1) Be able to be consistently executed in service by crews of average skill, (2) Use methods or devices that are safe and reliable, and (3) Include allowance for any time delays in the execution of the procedures, that may reasonably be expected in service. (See [AMC 25.101(h)(3)](#_DxCrossRefBm1709820726).) (i) The accelerate-stop and landing distances prescribed in [CS 25.109](#_DxCrossRefBm1709820677) and [25.125](#_DxCrossRefBm1709820685), respectively, must be determined with all the aeroplane wheel brake assemblies at the fully worn limit of their allowable wear range. (See [AMC 25.101(i)](#_DxCrossRefBm1709820725).) [Amdt 25/2] [Amdt 25/18]