MD23-215
User Guide
Mid-Continent Instruments and Avionics
7
User Guide UG215, Revision 1
December 9, 2021
4.1.4. ALTIMETER FUNCTIONS
BARO SYNC
The barometric pressure setting can be synchronized with an
external system (such as the primary avionics) via ARINC 429.
When available, two small gray triangles will appear next to the
Baro window. The baro value will follow and match the external
input and turn green while changing, and back to white when
stable. The baro setting can be manually changed at any time
by simply turning the Control Knob. The gray arrows will be
removed. If the external sync signal is still valid and available, it
will revert back to sync mode when the external input value changes.
STANDARD BARO
The user can change the barometric pressure value directly to
standard baro (29.92 inHg or 1013 mBar/hPa) using the
Standard feature. By pressing the Control Knob once, the STD
annunciation will be highlighted from gray to magenta. By
turning the Control Knob left or right and pressing when ON is
displayed, the baro will change to standard value.
This feature can be turned off in the User Options Menu or be
set to Auto. In Auto mode, the baro will automatically revert to
standard baro and the STD label will change from white to
green when the altitude ascends past 18,000 feet (FL 180; or equivalent meters). In auto mode,
the STD label will turn yellow when the aircraft descends below 18,000 feet, to indicate the need
to adjust the baro pressure to the applicable value. Manually adjusting the baro with the Control
Knob, or through the external sync will immediately take the unit out of Standard Baro mode.
ALTITUDE TARGET
The user can use the Altitude Target feature to set a point of
interest as a reminder or altitude acquisition value. The Target
feature can be turned on or off in the User Options Menu.
When on, the Target Value can be set by pressing the Control
Knob until the TRGT annunciator turns magenta.
Once the TRGT feature is active, turning the Control Knob left
or right will change the target value and rotate the magenta
Target Bug around the dial to its corresponding position. The
Target value has a resolution of 100 units. Once active, the bug
is only visible on the dial when the current altitude is within 800 units of the target. The bug is
cyan until the current altitude is within 200 units, then the bug and the target value will turn
amber. When within 50 units, the bug and target value will turn green.
