An airliner some years ago crashed into the Everglades in Florida because
was unknowingly disengaged by accidental knee pressure on the Yoke as the
was getting out of his seat. Specs showed that the minimum 45 pounds
pressure required was faulty.
The aircraft had been in a holding pattern pending confirmation that the
gear was down, since the
indicator lamp was burned out and the spare broke upon attempted removal
from its recessed
location. Unknowingly the aircraft was slowly descending and the last
thing on the voice
recorder ws the co-pilot "Hey, there's something wrong with the
instruments" when he
noticed the altimeter showed just above ground level.
If I understand the FG issue correctly, then I would think that a sudden
the Yoke could be used to disengage the autopilot.
----- Original Message -----
Sent: Saturday, June 30, 2007 12:12
Subject: Re: [Flightgear-devel] [off
list] patch for control lockingbyautopilot
On June 28, 2007 09:44:54 am Roy Vegard Ovesen wrote:
On Wednesday 27 June 2007 23:05, woodyst wrote:
> > > >> The
diffs are at
> > > >> http://www.eurogaran.com/fgfs/fgfs_ap_joy_locking.diff
> > > >> http://www.eurogaran.com/fgfs/kap140_locking_controls_capable.diff
AFAIK real life autopilots can be overpowered by the pilot. Wheter this
> done by brute force or if the servos can sense that they are
> overpowered and then let go, I don't know. Since we don't have
> feedback support in Flightgear, we'll have to make the
autopilot sense that
> it is being overpowered.
> The hard
part will be how to decide that the pilot is trying to overpower
autopilot. One possibility is to press a button to tell that you are
My guess is that it probably monitors the integrated term
in a PID controller,
and disengages when the value reaches a certain
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