Aircraft Fuel Systems · Converted to 423X3, effective 1976
Second directional code change in the source-stated career-ladder sequence; year precision preserved. Verified source wording: “In 1961, the AFSC was changed to 424X0. In 1976, it was again changed to 423X3.”
Sources
- Aircraft Fuel Systems Career Ladder. (Internet Archive full-text OCR around char offset 6,988; governing lineage context verified)