Downloaded from https://www.everyspec.com ADS-79D-HDBK FIGURE D-4. CI development flow diagram D.5.2.1 Understand the failure mode. From recovery of several of the failed IGB, it appears that the failure is along the tooth of the spiral bevel gear, and that all other aspects of the input pinion assembly appear to be normal. The cracks appear to initiate near the machined edge at the root of the tooth, but review of the drawings shows that the physical dimension and method of manufacture are as specified. The cracks are initiating in the areas of greatest stress, but there are no specific manufacturing defects which require a safety message limiting flight or recalling specific parts. 85