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Flight Management System (FMS) for the Agusta AW139/AB139 Helicopter
The CONVERSION 4/4 page, shown in Figure 6--81, shows the
QFE--QNH conversion page. The CONVERSION 4/4 page is designed
to support QFE/QNH conversions and give conversions between
barometric altimeter units.
01636.01
Figure 6- -81
CONVERSION 4/4
QNH altimeter settings result in the altimeter displaying the aircraft
altitude above mean sea level based on the local station pressure.
When an altimeter is set to QFE, the aircraft altitude above a station
is displayed. With the altimeter set to QFE and the aircraft on the
ground, zero (0) is displayed on the altimeter. Inflight QFE gives height
above
ground
level
(without
consideration
for
nonstandard
temperature).
When an elevation exists at 1R, entry of a QNH or QFE (in any unit)
results in the remaining parameters being displayed. Figure 6--82 is an
example with a QNH entry of 29.92. When an elevation does not exist,
the FMS is unable to convert to the QFE/QNH altimeter setting. When
the FMS is unable to covert to the QFE/QNH altimeter seetting, the
equivalent unit(s) for the entered altimeter setting are computed and
displayed.
A28- - 1146- - 181
Navigation
6-102
REV 3 Mar 2009
Honeywell International Inc. Do not copy without express permission of Honeywell.
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