AMC1 27.1521 Powerplant
limitations
ED Decision 2023/001/R
(a) Introduction
This AMC supplements FAA AC 27-1B, § AC 27.1521 and should be used in conjunction with that AC when demonstrating compliance with CS 27.1521.
(b) 30-minute power rating
(1) Explanation
The 30-minute power rating may be set at any level between the maximum continuous up to and including the take-off rating, and may be used for multiple periods of up to 30 minutes each, at any time between the take-off and landing phases in any flight.
This rating is associated with some limitations which should be adequately established and declared.
(2) Procedure
CS 27.1521(a) refers to the limits for which the engines are type certificated. This should include the 30-minute power rating usage and:
— the associated usage limit:
— maximum duration in one single shot up to 30 minutes;
— cumulative limit, if any, in one flight; and
— any other limits associated with the usage of the 30-minute power rating declared in the installation and/or operating manual of the engine.
[Amdt 27/10]
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