Anyway, here’s another question. I was always taught that if you have a full authority AFCS/Autopilot, that to protect anyone under the disc from the dangers of a control hard-over, you disengage it while on the ground. But we don’t in the 139. Why?
Presumably it is WOW switch (Weight On Wheels) related? Both the S-92 and EC-155 (and the 225 I think) are operated with the AFCS engaged on the ground, but the WOW logic disables it. I once had an EC-155 with a faulty WOW switch - that remained in 'ground logic' - and it resulted in an interesting few second as I lifted into the hover, trying to work out what was wrong (the a/c obviously wasn't stabilised, but non of the usual warnings/cautions to say the AP was disengaged, and I could see on the AP control panel that it was engaged!)