Procedure is applicable to aircraft motors which operate from constant-frequency@ nominally 400-cycle-per-second@ constantvoltage@ (nominally 115 volt line to neutral@ 3-phase four-wire or 115 volt single-phase) alternating-current aircraft power systems. This aircraft power system is defined by paragraph 3.2.1.3@ Type I of Military Specification No. MIL-E-7894. The test methods described herein will be suitable for test of machines of different frequency and voltage ranges. However@ test equipment must be chosen suitable for the desired ranges. Purpose. The purpose of this Procedure is to define uniform acceptable methods for making tests to determine the performance of alternating- current@ 400-cycle-per-second@ aircraft type@ induction electric motors. Aircraft type machines are subjected to environmental operating conditions much more stringent than those normally encountered by commercial type machines and yet minimum weight and the utmost reliability are essential to the application. Weight reduction is normally achieved by reduction of life expectancy@ thus making direct measurements a necessity in order to determine that reliability is commensurate with aircraft practices. It is recognized that there may be acceptable methods for making tests other than those included herein. However@ the methods in this publication are intended to serve as a standard for both manufacturers and users of aircraft motors. It is intended that the standardizing of test procedures will lead to coincident test data regardless of which party conducts the test.