AMS2403P results from a Five-Year Review and update of this specification with changes to ordering information, fixture/electrical contact locations reworded (3.1.3), procedure clarified and adding that spotting in is not allowed (3.2.1, 3.2.1.1, 3.2.2), thickness changed to allow direct measurement (3.4.1, 3.4.1.3, 3.1.1.3, 3.4.1.4), adhesion test clarification (3.4.2.1, 3.4.2.2, 3.4.2.2), heat resistance test clarification (3.4.3), corrosion resistance (3.4.4), hydrogen embrittlement (3.4.5), quality clarification (3.5), acceptance tests (4.2.1.1), sampling and testing lot standard wording and standard specimen size (4.3, 4.3.2, 4.3.3), approval clarification (4.4.1, 4.4.3), resampling and retesting (4.6), rejections (Section 7), and notes added (8.7, 8.8).