REV. F Sept 15, 2015 Manual Number 9017846
12
Flight Mode /
ALTITUDE OPERATION
or decreasing nature of the aircraft’s altitude. The Barometric
Window shows the currently set barometric pressure. It is identified
by the abbreviation BARO and is located at the top center of the
Airspeed/Altitude Display. Setting the current barometric pressure
compensates the altitude for the appropriate environmental conditions.
The barometric setting can be adjusted by turning the Control
Knob while in Flight Mode. When adjusting the barometric pressure
the digits will turn green (Image 9). When finished setting the pressure
the digits will return to their original color. Barometric pressure units
can be selected during Flight Mode using the Options Menu (see
Options Menu, page 20).
Note: If the unit is installed to receive
ARINC data from the Primary Flight Display (PFD), the BARO value
will automatically synchronize. When the two are synchronized two
arrows will appear on either side of BARO (Image 10). Manually
changing the MD302 barometric setting will override the external
source.
The Altitude Trend Bar is located along the right margin of the Altitude
Display. This feature can be turned ON or OFF using the Options Menu
(see Options Menu, page 23). The Altitude Trend Bar is magenta in
color and originates at the current altitude on the Altitude Scale —
always from the middle of the display, directly across from the Altitude
Pointer. The height of the Trend Bar, above or below the current
altitude, indicates the altitude of the aircraft on the Altitude Scale if
the current vertical speed or ‘altitude trend’ is maintained over a
period of six seconds. For example, as seen in Image 9, the current
altitude is approximately 2,420 feet. The Trend Bar is at approximately
2,470 feet, indicating that the aircraft’s altitude will be 2,470 feet in six
seconds if the current vertical speed or climb is maintained constant.
The length of the Trend Bar will increase with increased dive or climb
rates and approach zero or disappear entirely as the vertical speed
reaches zero in level flight.
