CS 25.1521 Powerplant limitations — CS-25

IRImplementing rule

CS 25.1521Powerplant limitations

(See AMC 25.1521)

(a)General. The powerplant limitations prescribed in this paragraph must be established so that they do not exceed the corresponding limits for which the engines or propellers are type certificated and do not exceed the values on which compliance with any other requirement of this Code is based.

(b)Reserved.

(c)Turbine engine installations. Operating limitations relating to the following must be established for turbine engine installations:

(1)Horsepower, torque or thrust, rpm, gas temperature, and time for –

(i)Maximum continuous power or thrust (relating to augmented or unaugmented operation as applicable).

(ii)Take-off power or thrust (relating to augmented or unaugmented operation as applicable).

(2)Fuel designation or specification.

(3)Maximum time interval between engine run-ups from idle, run-up power setting, duration at power, and the associated minimum ambient temperature, if any, demonstrated for the maximum time interval, for ground operation in icing conditions, as defined in CS 25.1093(b)(2).

(4)Any other parameter for which a limitation has been established as part of the engine type certificate except that a limitation need not be established for a parameter that cannot be exceeded during normal operation due to the design of the installation or to another established limitation.

(d)Ambient temperature. An ambient temperature limitation (including limitations for winterisation installations, if applicable) must be established as the maximum ambient atmospheric temperature established in accordance with CS 25.1043(b).

[Amdt 25/16]

IR · CS 25.1521 — CS-25 · ED Decision 2015/008/R · CS-25 Easy Access Rules · EAR revision 26 Jan 2023

AMCAcceptable means of compliance

AMC 25.1521Power-plant limitations

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1 In furnishing limitations, consideration should be given to the following. The list does not necessarily include all the items to be considered for a given aeroplane. a. Rotational speeds. b. Exhaust and/or turbine gas temperature. c. Oil temperatures and pressures. d. Fuel temperatures and pressures. e. Water and/or water methanol usage. f. Anti-icing. g. Specifications of approved fuels, oils and additives. 2 Other parameters, e.g. time, altitude, ambient temperatures, airspeed, may be necessary in defining power-plant limitations. 3 All operating phases should be considered in establishing the power-plant limitations.

AMC · AMC 25.1521 — CS-25 · ED Decision 2003/2/RM · CS-25 Easy Access Rules · EAR revision 26 Jan 2023