Installation of S-TEC System 55 two axis automatic flight guidance system, Model ST-559, with optional automatic electric trim system.

Century automatic flight system kit No. YK918/FD consisting of Century 41 autopilot flight director.

Installation of S-TEC system 60 two axis automatic flight guidance system, model ST-398.

Installation of S-TEC System 65 two axis automatic flight guidance system, model ST-397.

Installation of King KFC 250 flight control system (3 axis) using 3-inch or 4-inch indicators.

Install King KFC-200 flight control system with or without flight director.

Mitchell automatic flight system AK624 consisting of Century IV autopilot or AK624FD consisting of Century IV flight director autopilot with optional remote annunciator.

Mitchell automatic flight system AK774/FD consisting of Century IV/ flight director autopilot with optional remote annunciator.

Installation of S-TEC System 65 two axis automatic flight guidance system, Model ST-379.

Installation of Bendix/King KFC 225 Automatic Flight Control System. For Model 421C, serial numbers 421C0401 and after.