Profit Max wrote:
The change in radio altitude is not equal to the sink rate! Think of terrain - tall buildings, cliffs, hills, etc. If steep enough, this could lead to very high "sink rates" according to your calculation.
Right! I still think it should be possible to apply some kind of sanity check here. Anyway, getting rid of auto-retard in a single channel approach is IMHO the best solution (unless someone gives me a good reason to keep it).