Beechcraft C-12C Operator And Technical Reference Manual page 277

illuminate. Glideslope capture is dependent on
localizer capture and must occur after localizer
capture. The localizer is always captured from a
selected heading, but the glideslope may be captured
with autopilot operating in any vertical mode (pitch
hold, altitude hold, or indicated airspeed hold), and
from above (not recommended) or below the
glideslope. At the point of glideslope intercept, the GS
CAP annunciator lamp will illuminate and all pre-
selected vertical modes will be cleared.
During coupled
VOR/localizer signal is lost, or frequency
changes, the flight director command bars
will remain in view displaying unreliable
indications.
(f) Go-Around Mode. Pressing the GO
AROUND button on the outboard side of the left power
lever selects the go-around mode. Go-around mode
may be selected from any lateral mode, HDG, NAV,
APPR, or BACK LOC.
selected, the autopilot will disengage, the GA
annunciator lamp will illuminate, and a command
presentation for wings level and 7q nose up pitch
attitude will appear on the pilot's horizon reference
indicator.
The heading marker may be preset to the
go around heading after the localizer is
captured. After go-around airspeed and
power settings are established, select the
HDG mode to clear the go-around mode.
Pitch attitude will remain at that used for
go-around until changed with the PITCH
SYNC & CWS button or the selection of a
vertical mode.
(g) Pitch Hold Mode.
mode is selected by selecting one of the vertical mode
selector switches or actuating the pitch synchronize
and control wheel steering switch, PITCH SYNC &
CWS, located on each control wheel.
(h) Control
Pressing one of the PITCH SYNC & CWS switches
located on each control wheel disconnects the
autopilot servos from the control surfaces, allows the
pilot to fly the aircraft to a new pitch attitude, and
synchronizes the vertical command bar on the pilot's
horizon reference indicator to aircraft attitude.
ALT or IAS mode will disengage, if selected, when the
PITCH SYNC & CWS button is pressed. When the
autopilot is coupled to the HDG, NAV, APPR, or BACK
LOC modes, releasing the PITCH SYNC & CWS
NOTE
approaches, if the
When go-around mode is
NOTE
The pitch hold
Wheel Steering
switch will cause the autopilot to couple to the
previously selected mode.
(i) Altitude Hold Mode.
ALT selector switch on the autopilot mode selector
panel when desired altitude has been reached, with
autopilot engaged, will cause the autopilot to fly the
aircraft to maintain the barometric altitude at which the
aircraft was flying when ALT switch was pressed,
illuminate the
autopilot/flight director annunciator panel, and display
the altitude hold commands on the vertical command
bar of the pilot's horizon reference indicator with the
flight director engaged.
(j) Indicated
Pressing the IAS selector switch on the autopilot mode
selector panel when desired airspeed has been
reached, with autopilot engaged, will cause the
autopilot to fly the aircraft to maintain the indicated
airspeed at which the aircraft was flying when IAS
switch was pressed, illuminate the IAS annunciator
lamp on autopilot/flight director annunciator panel, and
display the IAS hold commands on the vertical
command bar of the pilot's horizon reference indicator.
i. Takeoff and Climbout.
(1) Before Takeoff.
1. Heading marker, pilot's horizontal
2. HDG selector switch, autopilot mode
(2) Takeoff. Pressing the PITCH SYNC &
CWS switch on control wheel will provide pitch sync
and the crosspointers on the pilot's horizon reference
indicator will command flight to the pitch attitude that
existed at the time the PITCH SYNC & CWS switch
was pressed.
(3) Climbout.
Mode.
1. Climb profile – Establish.
2. ENG / DIS switch – ENG, when above
The
3. IAS selector switch – Press if desired.
4. HDG knob – Move heading marker as
(4) Cruise Altitude.
TM 1-1510-218-10
ALT annunciator lamp
Airspeed
situation indicator – Set to runway
heading.
selector panel – Press, do not engage
autopilot.
200 feet above ground level.
required to make heading changes.
Pressing the
on the
Hold Mode.
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