Decades ago, we were flying an FMS demonstration in a Beech King Air with conventional analog flight instruments, a basic weather radar and an analog autopilot. The purpose of the demo was to show off the advanced capabilities of the FMS, including its ability to automatically transition from the en route to the approach mode. The avionics company that owned the aircraft suggested we challenge the system by selecting a non-precision approach with a DME arc from the initial approach fix ...

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