Project High Wire was a United States Air Force (USAF) modernization programme for selected North American Aviation F-100C, D and F Super Sabres that were still in active inventory. It consisted of two detailed modification groups: significant electrical rewiring upgrade, and heavy aircraft maintenance and IRAN (inspect and repair as necessary) upgrade. These upgrades began in 1962.[1]
Rewiring upgrade operation consisted of replacing old wiring and harnesses with improved maintainable designs while heavy maintenance and IRAN included new kits, modifications, standardized configurations, repairs, replacements and complete refurbishment.[2]