Piper SENECA III - Page 267

PIPER
AIRCRAFT
CORPORATION
SECTION
9
PA-34-220T,
SENECA
III SUPPLEMENT
4
(d)
AUTOPILOT
DISENGAGEMENT
(l)
The
autopilot
can
be
manually
disengaged
by
the following
actions:
a.
Press
the
AP DISC/TRIM INTERRUPT
switch
on
the
pilot's
control
wheel.
b.
Move
the
Autopilot ON-OFF handle
to
the
OFF position.
c.
Engage
the
Go-Around
mode.
d. Pull the
AUTOPILOT
circuit
breaker
out
(OFF)
e.
Turn
off
the
RADIO
POWER
switch.
f.
Operate
manual
electric
trim
switch
UP
or
DN.
(2)
The
following conditions
will
cause
the Autopilot
to auto-
matically
disengage:
a.
Power
failure,
b.
Internal
Flight Control System
failure.
c.
With
the KCS 55A
compass
system,
a
loss
of
compass
valid
(displaying
HDG
flag) disengages
the Autopilot
and Flight
Director
when
a
mode
using
heading
information
is
engaged.
With
the
HDG flag
present
only
vertical
modes
can
be
selected
for
FD
or
Autopilot
operation.
(e)
MAXIMUM
ALTlTUDE LOSSES DUE TO
AUTOPILOT
MALFUNCTIONS
Cruise, Climb, Descent
400 feet
Maneuvering
100
feet
APPR 50 feet
SE APPR
50
feet
CAUTION
When
the
autopilot is
engaged, manual
application of
a
force
to
the
pitch axis of
the
control
wheel
for
a
period
of
three
seconds
or
more
will
result
in the autotrim
system
operating in
the
direction
to create
a
force
opposing
the
pilot.
This
opposing
mistrim
force
will
continue
to
increase
as
long
as
the pilot
applies
a
force
to
the
control
wheel,
and will
ultimately
overpower
the
autopilot.
If
the
autopilot is
disengaged under
these
conditions,
the
pilot
may
be
required
to exert
control forces
in
excess
of
50
pounds
to
maintain
the desired
airplane
attitude.
The
pilot will have
to
maintain
this
control
force
while
he
manually
retrims
the
airplane.
ISSUED: APRIL
21, 1981
REPORT:
VB-1110
5
of
16,
9-23