Re: Oscillation during flight

From:         "David G. Davidson" <>
Date:         10 Jul 96 12:47:14 
References:   1 2
Next article
View raw article
  or MIME structure

>>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.