AMC1 27.337 Limit
manoeuvring load factor
ED Decision 2023/001/R
This AMC supplements FAA AC 27-1B, § AC 27.337 and should be used in conjunction with that AC when demonstrating compliance with CS 27.337 for determining the positive limit manoeuvring load factor.
In accordance with CS 27.337, the rotorcraft may be substantiated to a maximum positive load factor less than +3.5 (but not less than 2.0) provided that the probability of being exceeded is shown to be extremely remote. Whenever this option is selected, the maximum available rotor lift with both power on and power off rotor speed ranges throughout the entire operational density envelope should be considered.
AC 27-1B, § AC 27.337(b)(1) provides some guidance as to the necessary considerations when substantiating manoeuvre load factors less than the specified values. Further clarification should be provided in this paragraph to specify that the entire operational envelope should be considered when determining the maximum available rotor lift.
The guidance should be read as follows:
§ AC 27.337(b)(1) The applicant may elect to substantiate the rotorcraft for a design manoeuvring load factor less than +3.5 and more than -1.0. Whenever this option is used, an analytical study and flight demonstration are required. Maximum available rotor lift with both power on and power off throughout the entire operational density envelope should be considered when substantiating manoeuvre load factors less than the specified values.
[Amdt 27/10]
Small rotorcraft maneuvering load factor limits require demonstrating extremely remote probability of exceeding specified values. Compliance involves analytical study, flight demonstration, and considering maximum rotor lift throughout the entire operational density envelope for load factors less than +3.5, ensuring safe operation.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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