Aircraft Fuel Systems · Converted to 424X0, effective 1961
First directional code change in the source-stated career-ladder sequence; year precision preserved. Verified source wording: “The Aircraft Fuel Systems career ladder began in December 1956 as AFSC 43155. In 1961, the AFSC was changed to 424X0.”
Sources
- Aircraft Fuel Systems Career Ladder. (Internet Archive full-text OCR around char offset 6,988; governing lineage context verified)