Originally Posted by
albatross
The autopilot does not give any protection for high Rotor RPM. It was the first thing I was warned about when I got my check on type. In fact I don’t know of any autopilot that does.
The H145 Helionix AFCS has protections against inadvertent coupled entry into autorotation (and so by inference protection from NR split off). Also has a handy marker on the otherwise diabolical FLI that shows where NR split off will occur (the FLI is a collective pitch gauge so zero pitch is not zero torque) The latest version (for D3) also has protection from droopping the NR when OEI. I presume there are similar protections on similar Airbus Helionix types.
Originally Posted by
albatross
They joy of punching in heading on an early Sperry without centering the heading bug first was exhilarating too.
The heading bug defaulting to North on early EC135 led to the loss of a Scottish Police aircraft (not Clutha). I hope to high heaven any future autopilot won't have this "feature".