MIL-P-85573

Abstract

This specification establishes the performance, operating characteristics, design features, detailed interface configuration definitions, and installation envelopes for a gas turbine auxiliary power unit (APU). This specification also establishes the demonstrations, tests, reports, inspection procedures, and other data required for satisfactory completion and acceptance, by the Using Service, of the Preliminary Flight Rating Tests (PFRT) and the Verification Tests (VT) for APUs. Further, this specification identifies the tests, procedures and data required for satisfactory completion of the Acceptance Tests (AT) of each production unit. Notwithstanding the requirements for test verification of individual points of performance or operating characteristics of the APUs covered by this specification for purposes of PFRT, VT, or AT; the manufacturer/contractor shall continue to be fully responsible for all features, characteristics, and performance of the APU throughout the environmental conditions and operating envelope, to the extent required by the applicable contract. This specification also establishes the content and format to be used by the contractor for the preparation of the model specification. <b><u>Intended Use:</u></b> The APUs covered by this specification are intended for use onboard an aircraft. The APUs will be used to supply compressed air for aircraft engine pneumatic starting systems and environmental cooling systems, and as a power source to drive hydraulic pumps, generators and other aircraft accessories. <br>