BMM389EC
5th Dec 2005, 03:26
What's the difference between these two again??
FLEXJET
5th Dec 2005, 08:33
http://www.iasa.com.au/folders/RoboLander_files/AutolandFailmodes.htm
When Google performs a search, Australians are the winner for this one!
Piltdown Man
5th Dec 2005, 21:27
Or of you can't be bothered to search, think about this senario. You are making a CAT IIIB approach and as you decend, one of channels of one the autopilots does a naughty. You'll probably find that the approach can still be continued safely and that you can continue safely to CAT IIIA minima. This would be considered to be "Fail Operational". Now, (and this is where we praise the certification neddies), consider if the same channel in the remaining autopilot fails. If this failure still enables the aircraft to be controlled safely (no trim runaway, control not frozen etc.), then this would be "Fail Passive". Our certification Neddies therefore require aircraft to "fail passive" when they are flown "close to the spuds" in fog.