Beechcraft C-12C, Operator And Technical Reference Manual

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TM 1-1510-218-10
Chanute, Kansas (CNU). It is necessary in this case
to add the "K" prefix to make the letter KCNU.
(2) Navaid ICAO Identifiers. Most navaid
identifiers are made up of three letters, but
combinations of two or three letters and number also
exist.
(3) Waypoint ICAO Identifiers. Most
waypoint identifiers (high altitude, low altitude,
multiple, and approach intersections) consist of five
letters, however, some waypoint identifiers consist of
combinations of three to five letters and numbers such
as GOONI, D3N, and L121.
(4) Runway Thresholds and Outer Markers.
Runway thresholds and outer markers are not stored
in the data base by ICAO identifiers. Access is from
the appropriate airport waypoint page.
(5) On-airway NDB ICAO Identifiers. NDB's
that are located on an airway are contained in the data
base whenever any type of waypoint (high altitude, low
altitude, DP/STAR, or approach intersection) has been
loaded into the data base. On airway NDB's are
accessed by the two or three character identifier plus
an NB suffix, such as GNINB.
h. Dedicated Special Function Keys.
Dedicated special function keys are physically and
visually separated from the alpha/numeric keys used
in the generation and storage of flight plans and
waypoints.
i. FMS Interface with the MFD Radar
Graphics Unit. The FMS interfaces with the MFD
radar graphics unit, providing a radar graphics
presentation on the weather radar display. This
includes such items as flight plan waypoints, selected
course, and reference ground stations.
j. Bulk Loading and Saving Using Data
Loader. In addition to updating the data base, the
data loader may be used to load and save flight plans,
waypoints, and the user generated supplemental data
base.
k. FMS Control-Display Unit Controls and
Functions.
(1) Message Key and Annunicator. An
alternate-action key placarded MSG , when pressed
causes the message page to be displayed. Pressing
the key once selects the message page, pressing the
key again deselects the message page. The message
annunciator is located above the message key.
Illumination of the message light indicates that a
message will be displayed on the FMS control-
displayed unit when the message key is pressed. The
message key is used to acknowledge a message
annunciator. The message annunciator will be
extinguished only after the message has been
satisfactorily acknowledged.
(2) Cursor Keys. Two cursor keys are
provided,
n
and
p
, to position the cursor (a bright
inverse video rectangle) over information in a line or
portion of a line on the control display unit, in order to
approve or change that information. If the cursor is out
of view it can be brought onto the screen at the top or
bottom by using the up or down cursor key.
(3) Mode Key. This key, placarded MODE ,
allows selection of NAV, RNV ENR (RNAV en route),
or RNV APR (RNAV approach) modes of operation.
When NAV is selected, normal angular HSI deviation
bar sensitivity occurs (+ 10° full scale). When RNV
ENR s selected the deviation bar ind 5 nautical
mile full scale and when in RNV APR the deviation
indicates ± 1.25 nautical mile full scale. When an ILS
frequency is selected the sensor annunciated is ILS.
OBS will be displayed as the method of operation and
ILS will be displayed and the mode of operation.
When the OMEGA or BLEND sensor is selected, RNV
ENR is automatically selected as the only mode of
operation.
(4) Sensor Key. The sensor key, placarded
SNS , selects the active sensor to be used for
navigation. Alternate key strokes will select VOR,
OMEGA, TACAN, GPS, or BLEND. When the VOR
sensor is selected, navigation is based upon available
VOR/DME signals. When an ILS frequency has been
selected as the active waypoint the sensor
annunciation indicates ILS. When the OMEGA sensor
is selected, navigation is based upon available omega
and VLF signals. When the GPS sensor is selected,
the NAVSTAR satellite global positioning system GPS)
is used for navigation information. When the BLEND
sensor is selected, navigation is based on a computer
blend of position inputs from all active sensors.
(5) OBS/LEG Key. The OBS/LEG key
selects method of operation. Each key push selects
the next method of operation in the sequence of OBS,
AUTO/LEG, then back to OBS.
(6) Frequency Key. The frequency key,
placarded FREQ , selects the two frequency pages that
allow frequency management of the VHF transceivers,
NAV/TACAN, NAV 2, and the ADF receivers.
(7) Brightness Control Switch. The
brightness control switch, placarded BRT DIM , is a
rocker type switch which, when pressed at the top,
increases the picture brightness and message light
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