Originally Posted by
Microburst2002
I guess that the FCS uses IR (rather than ADR) altitude,
My understanding is that IRs have no altitude data.
I did not read well your post. So you have all pitot blocked. What happened? If the three of them give the same incorrect values, the failures would go undetected by the ADRs?. Was this the case or did they fail one by one?
It was a LOFT sim scenario, first pitot 3 was blocked in climb (stby ASI overreads gibberish, ADR3 fault), then, en-route, loss of speed on ADR1+2, no speed info information whatsoever. Managed according to Unreliable Airspeed tables from QRH, done easier and more precise than I would have had expected.
Regarding stick free in direct law... Do the surfaces float of remain fixed in the position corresponding to the sidestick angle
By "stick free" I ment 'manual flight with stick released' in the scenario given and sim used we did not encounter DCT law at all. If so, as you well know, the control surfaces are controlled conventially in proportion to side stick movement.
FD (the un-real)