This document provides guidelines for the process used to establish the equivalency of TTE and related procedures other than that recommended by the OEM. Figure 1 is provided to assist in establishing when an equivalency determination is necessary. Primarily, this report is concerned with equipment specified or recommended for the purpose of performing specific tasks concerning the airworthiness of an article (e.g., avionics, hydraulics, pneumatics, mechanical devices, etc). However, this process may be used to establish the equivalency to any OEM-recommended tool or device.

In those instances where the airline or repair station uses the OEM recommended equipment, no proof of equivalency is necessary.

If during a TTE equivalency process it becomes necessary to alter a test procedure, consult ARINC Report 625: Quality Management Process for Test Procedure Generation.

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