Downloaded from https://www.everyspec.com ADS-39A (HDBK) 3.3.4.2.2 Components and assemblies requiring endurance testing are to be incorporated into the higher-level assembly that is needed to support testing (hereinafter referred to as the “test assembly”). The level of assembly used (e.g., complete gearbox or a specific quill assembly or module) is usually dependent upon the test facility chosen. For individual components requiring endurance testing, the component shall be incorporated into the test assembly by an approved assembly source. For assemblies requiring endurance testing, the assembly shall be accomplished by the candidate alternate source.
Assembly instructions shall be as specified in the approved manufacturing plan. 3.3.4.2.3 Components and assemblies requiring endurance testing are identified in Attachment 1. XXX indicates the length of the endurance test. 3.3.4.2.4 Components undergoing 5-hour endurance testing shall be installed in mesh with components produced by approved and tested sources. Components undergoing endurance tests of duration greater than 5 hours may be run in mesh with other components from untested sources, but will then be required to complete a 5-hour endurance test while run in mesh with a component from an approved and tested source.
3.3.4.2.5 Specific Statements of Work (SOW) for the endurance test shall be prepared by ATCOM Engineering after the inspection requirements of Section 3.3.3 above have been completed by the candidate alternate source. Other test requirements are as specified in TEST- STD-1. General requirements are given below. 3.3.4.2.5.1 Test assembly static patterns obtained shall meet the dimensional and positional requirements as given in the SOW. Copies of the static pattern shall be retained for each bevel gear in the test assembly. 3.3.4.2.5.2 After approval of the static patterns is given, the test assembly shall undergo an Acceptance Test in accordance with the SOW.
At the conclusion of the Acceptance Test, the dynamic patterns shall meet the requirements given in the SOW. 3.3.4.2.5.3 After approval of the dynamic patterns is given, the test assembly shall undergo an endurance bench test, of duration as specified in Attachment 1. 3.3.4.2.5.4 Testing shall be in accordance with the test spectrum identified in Attachment 1 and provided in Attachment 2. For endurance tests of 25 hours duration or less, other test spectrums may be used. These test spectrums shall be given in the SOW, and in no case will they be to greater levels than the test spectrum identified in Attachment 1.
3.3.4.2.5.5 Dynamic patterns shall be periodically examined (every 25 hours) to insure no adverse wear characteristics are evident. 8