Piper ARCHER II - Coupled Go-Around; Electronic Stability and Protection (ESP)

Coupled
Go-Around
—
Pressing
the
GA
button
will
not
disengage
the
autopilot.
Instead,
the
autopilot
will
attempt
to
capture
and
track
the
flight
director
command
bars.
_{f
insufficient
airplane
performance
is
available
to
follow
the
commands,
the
autopilot
will
enter
Underspeed
Protection
mode
at
the
minimum
airspeed.
Electronic
Stability
and
Protection
(ESP)
—
The
GFC
500
will
provide
Electronic
Stability
and
Protection
when
the
autopilot
is
not
engaged.
Electronic
Stability
and
Protection
(ESP)
uses
the
autopilot
servos
to
assist
the
pilot
in
maintaining
the
airplane
in
a
safe
flight
condition
within
the
airplane's
normal
pitch,
roll
and
airspeed
envelopes.
Electronic
Stability
and
Protection
is
activated
when
the
pilot
allows
the
airplane
to
exceed
one
or
more
conditions
beyond
normal
flight
as
defined
below:
e
Pitch
attitude
beyond
normal
flight
(+20°,
-15°)
e
Roll
attitude
beyond
normal
flight
(45°)
«
High
airspeed
beyond
normal
flight
(above
Vue
+
1
KIAS
[1
MPH])
e
Low
airspeed
below
normal
flight
(below
Vs
+
5
KIAS
[5
MPH])
ESP requires:
e
Pitch
and
Roll
servos
are
installed
and
functioning
e Autopilot not engaged
e The GPS altitude above ground is more than 200 feet (for low airspeed made)
e
Aircraft
is
within
the
autopilot
engagement
envelope
(+/-50°
in
pitch
and
+/-75°
in
roll)
Protection
for
excessive
Pitch,
Roll,
and
Airspeed
is
provided
when
the
limit
thresholds
are
first
exceeded,
which
engages
the
appropriate
servo
in
ESP
mode
at
a
nominal
torque
level
to
bring
the
airplane
back
within
the
normal
flight envelope. If the airplane deviates further from the normal flight envelope, the servo torque will increase
until the maximum torque level is reached in an atlempt to retum the airplane into the normal flight envelope.
Once the airplane retums to within the normal flight envelope, ESP will deactivate the autopilot servos.
When
the
nomnal
flight
envelope
thresholds
have
been
exceeded
for
more
than
10
seconds,
ESP
Autolevel
Made
is
activated.
Autolevel
Mode
engages
the
autopilot
to
bring
the
airplane
back
into
straight
and
level
flight
based
on
0°
roll
angle
and
0
FPM
vertical
speed.
An
aural,
“ENGAGING
AUTOPILOT’
(or
a
Sonalert
tone),
sounds
and
the
Flight
Director
mode
annunciation
will
indicate
LVL
for
the
pitch
and
roll
modes.
Any
time
an
ESP
mode
is
active,
the
pilot
can
interrupt
ESP
by
using
the
Autopilot
Disconnect
(AP
DISC
/
TRIM
INT)
switch,
or
simply
override
ESP
by
overpowering
the
autopilot
servos.
The
pilot
may
also
disable
ESP
through
the
G5
menu.
The
engagement
and
disengagement
attilude
limits
are
displayed
with
double
hash
marks
on
the
rall
indicator
depending
on
the
airplane
attitude
and
whether
or
nol
ESP
is
active
in
roll.
When
ESP
is
inactive
(roll
attitude
within
nominal
limits)
only
the
engagement
limit
indicalions
are
displayed
in
order
to
reduce
clutter
on
the
roll
indicator.
Display
symbology
implemented
for
ESP
is
illustrated
in
the
following
figures.
AFMS — GFC 500 Autopilot in Piper PA-28 Series 190-02291-07 Rev. 5
Page 7-2