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.