Federal Register - September 27, 2021
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Source: Federal Register
53534
Federal Register / Vol. 86, No. 184 / Monday, September 27, 2021 / Rules and Regulations
rotating components. The applicant must define by test, validated analysis, or a combination thereof, and document in the engine installation manual, the energy level, trajectory, and size of fragments released from damage caused by the main rotor failure, and that pass forward or aft of the surrounding case.
31. Operation With a Variable Pitch Propeller
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The applicant must conduct functional demonstrations including feathering, negative torque, negative thrust, and reverse thrust operations, as applicable, with a representative propeller. These demonstrations may be conducted in a manner acceptable to the Administrator as part of the endurance,
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durability, and operation demonstrations.
32. General Conduct of Tests a Maintenance of the engine may be made during the tests in accordance with the service and maintenance instructions submitted in compliance with 33.4.
b The applicant must subject the engine or its parts to maintenance and additional tests that the Administrator finds necessary if 1 The frequency of the service is excessive;
2 The number of stops due to engine malfunction is excessive;
3 Major repairs are needed; or
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4 Replacement of a part is found necessary during the tests or due to the teardown inspection findings.
c Upon completion of all demonstrations and testing specified in these special conditions, the engine and its components must be 1 Within serviceable limits;
2 Safe for continued operation; and 3 Capable of operating at declared ratings while remaining within limits.
Issued in Kansas City, Missouri, on September 10, 2021.
Patrick R. Mullen, Manager, Technical Innovation Policy Branch, Policy and Innovation Division, Aircraft Certification Service.
FR Doc. 202119926 Filed 92421; 8:45 am BILLING CODE 491013P
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27SER3
