Provides a spares replacement kit for replacing the electroluminescent (E.L.) power supply on Models 690A, 690B.
Provides inertia reel and shoulder harness for crew seats. Models 500S, 685, 690, 690A, 690B.
Provides firewall shutoff valves for the bleed air system and a system to warn of high temperatures in the aft fuselage (that may be caused by bleed air leaks). Models 690A, 690B.
Provides a fuel low level warning system for the earlier Commander Models except 680T, 680V, 680W, 681.