In a message dated 8/23/2005 11:33:01 P.M. Central Standard Time,
Lancair1@bellsouth.net writes:
During
today's phase 1 flight I started checking the autopilot, an S-Tec
55x. When
altitude hold is engaged the aircraft starts to porpoise. Acts
like the
pitch servo is making a larger correction then is necessary for
the
sensitive pitch of a IV. Has anyone had this
problem?
Check your grounds on the autopilot.