
Round Dials
1
st
Ed Nov 2018
IDU-450 EFIS Software Version 8.0H (Rotorcraft)
RD-3
The altimeter setting digitally displays the
altimeter setting in either inches of mercury
(inHg) or millibars (mbar) according to the pilot-
selected units.
Figure RD-4: Altimeter QNH
The mode is annunciated as QFE operations
otherwise, no mode is annunciated
Figure RD-5: Altimeter QFE
QFE
: Barometric setting resulting in the
altimeter displaying height above a reference elevation (i.e., airport or
runway threshold).
QNE
: Standard barometric setting (29.92 inHg or 1013 mbar) used to
display pressure altitude for flight above the transition altitude.
QNH
: Barometric setting resulting in the altimeter displaying altitude above
mean sea level at the reporting station.
RD 4. Altitude Display
The altitude readout digitally displays barometric
altitude to the nearest ten feet as adjusted by an
altimeter setting and shows a 1000-foot range
with labels and graduations every 100 feet. CW
rotation of the pointer indicates increasing
altitude. All graduations are removed when
below sea level.
Figure RD-6: Altitude Display