Originally Posted by
glum
Genghis: The pilot over-ride is a slightly tricky one. We initially thought of a PIN number, but the lecturer reckons in the heat of a systems malfunction, the last thing the pilot needed was to try and bring to mind a PIN number! Far better to have a couple of manual over-ride switches or buttons, which would require simultaneous operation (perhaps).
All you need is an audible warning and an illuminated "I'm still alive" override cancel switch, possibly guarded, in clear view. You really don't want this to be multi-control or like a security system - it really must be as simple as possible - the pilot the aeroplane thinks is asleep may be busy troubleshooting something, or planning a weather diversion with a manual or chart open on his lap.
G