MODES AND ANNUNCIATION
Each of the autopilot/flight director modes is
described in brief below along with the an-
nunciation which accompanies the mode. op-
eration of the mode is the same for autopilot
engaged and flight director only, unless oth-
erwise stated.
Heading Hold/Roll Hold
The basic mode of the autopilot is heading
hold/wings level. If no other mode is selected
via the GC-810 the system will default to
Heading Hold. If the autopilot is engaged
while the airplane is in a bank, the system will
engage into Wings Level and once the bank
angle is less than 3 degrees for 10 seconds, the
Heading Hold Mode will be engaged. The
Heading Hold mode is not annunciated on the
EADI as it is the default mode when no other
mode is annunciated.
The autopilot will hold the desired roll attitude
when the TCS button is depressed and re-
leased with the roll attitude greater than 6 de-
grees and less than 35. The selected bank angle
will be held until the TCS button is used to
lower the roll angle to less than 6 degrees. If
the TCS button is released at roll angles greater
than 35 degrees, the AFCS will cause the air-
plane to roll 35 degrees. The TCS mode causes
the display of “TCS” on the EADI. This ex-
tinguishes the AP engage arrow on the GC-810
controller indicating that the autopilot servos
are not engaged.
When the autopilot is engaged this basic mode
is annunciated by a green flashing "ROL" for
5 seconds.
Pitch Hold
The basic pitch mode of the AFCS is pitch
hold. When no flight director modes are en-
gaged the default mode of the autopilot is
pitch hold. If a roll flight director mode has
been selected and no other pitch mode is se-
lected, the flight director will engage into the
pitch hold mode and a pitch command bar will
be displayed.
When the autopilot is engaged, this basic mode
is annunciated by a green flashing “PIT” for
5 seconds.
The reference pitch attitude may be changed
via the pitch wheel or use of the TCS mode.
Heading Select
When the heading select mode is engaged, the
AFCS will control the airplane through roll to fol-
low the heading bug on the selected HSI. This
mode is annunciated as “HDG” on the EADI.
The HDG Select mode may be cancelled by de-
pressing the HDG pushbutton.
This node is limited to +/-180 degree turns.
The low bank limit can be selected by de-
pressing the -BNK pushbutton on the Guidance
Controller; which is annunciated by a white
low bank symbol on the top of the attitude
sphere on the EADI. The low bank limit is au-
tomatically selected when climbing through
29,000 feet with bank angle less than 6 degrees.
VOR Mode
This mode is selected when the navigation re-
ceiver is tuned to a VOR frequency, the VOR
nav source has been selected for display, the
NAV pushbutton is depressed, and the beam
deviation is below the capture threshold of
175 millivolts (2 dots equals 150 millivolts).
If Heading Select is not engaged at the time
the VOR mode is selected, the Heading Select
Mode is automatically selected when the VOR
mode is armed. Prior to capture, the VOR
armed mode is annunciated as a white “VOR”
message on the EADI. When the capture cri-
teria are met, the white armed message is re-
placed by the green “VOR”. At this time, the
HDG select mode will cancel and the green
“VOR” is flashed for 5 seconds to emphasize
the transition.
Passage over the VOR station will cause the sys-
tem to revert to the over station submode. This
causes the AFCS to ignore the erratic VOR de-
viation signals which are a result of the station
passage. Once the system is in the over station
16A-6
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
Summary of Contents for 800 XP
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