Beechcraft C-12C, Operator And Technical Reference Manual

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TM 1-1510-218-10
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.
NOTE
During coupled approaches, if the
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. When go-around mode is
selected, the autopilot will disengage, the
GA
annunciator lamp will illuminate, and a command
presentation for wings level and 7
q
nose up pitch
attitude will appear on the pilot's horizon reference
indicator.
NOTE
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. The pitch hold
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 Wheel Steering Mode.
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. The
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
switch will cause the autopilot to couple to the
previously selected mode.
(i) Altitude Hold Mode. Pressing the
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 ALT annunciator lamp on 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 Airspeed Hold Mode.
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
situation indicator – Set to runway
heading.
2. HDG selector switch, autopilot mode
selector panel – Press, do not engage
autopilot.
(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.
1. Climb profile – Establish.
2. ENG / DIS switch – ENG , when above
200 feet above ground level.
3. IAS selector switch – Press if desired.
4. HDG knob – Move heading marker as
required to make heading changes.
(4) Cruise Altitude.
3A-35