Re: Oscillation during flight

From:         "David G. Davidson" <gerhard@onramp.net>
Organization: http://members.aol.com/tristar500/l1011
Date:         10 Jul 96 12:47:14 
References:   1 2
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>>Sounds like an autopilot failure.<<

The 727 is notorious for having an autopilot that 'porpoises'. It's
generally caused by slop in the linkage in the elevator and stabilizer
position sensors. This can also be caused by a bad air data computer or
the pitch computer.