"'Tis true the a/p will trip in flight if the stab does not respond to FCC/SAM demands. "
Interesting... The 767 Boeing Maintenance Manual (22-14-00 p14) tells me that:
"The following conditions cause a CAUTION SIGNAL (their emphasis, not mine) prior to multi-channel engage only:
a) Failure of Air Data Computer, Radio Alitimeter, and Insturment Landing System (outer loop) data or interfaces for 4 seconds when the pitch or roll servos are engaged.
b) An elevator or aileron servo cammout (sic) monitor was tripped.
c) An automatic stabilizer trim failure when the servos are engaged
d) etc...."
I'm assuming that an EICAS Caution will not be present at the same time as an autopilot disconnect warning.
Cheers.
Q.