440 Pistons, How F*cked am I
If it helps.......
https://magnaflux.com/Magnaflux/Resources/FAQs/FAQs--Liquid-Penetrant-Inspection
Way back in the day at the piston pin mfg. outfit I worked for, a Magnaflux Corporation Instructor was called in to train several of us final inspectors. Certs were a requirement for the MPI of aircraft pins and some locomotive. Lycoming, Continental, and GE were a couple as I recall.
If it helps.......
https://magnaflux.com/Magnaflux/Resources/FAQs/FAQs--Liquid-Penetrant-Inspection
Way back in the day at the piston pin mfg. outfit I worked for, a Magnaflux Corporation Instructor was called in to train several of us final inspectors. Certs were a requirement for the MPI of aircraft pins and some locomotive. Lycoming, Continental, and GE were a couple as I recall.