VOR (VHF OMNI-DIRECTIONAL RADIO RANGE) INDICATORS
• NAV SOURCE
VOR1 legend is displayed when navigation data is from the number
one side. VOR2 is displayed when navigation data is from the number
two side.
The VOR1 or VOR2 legend is displayed when VOR/LOC mode is
selected and the NAV source is not tuned to a localizer frequency.
When the NAV source is tuned to a localizer frequency, the LOC1 or
LOC2 annunciator is displayed.
• TO/FROM INDICATOR
The TO/FROM indicator is a white triangle superimposed on the center
line of the course pointer. It is positioned at the nose (TO) or tail
(FROM) of the helicopter symbol, and moves with the course ù pointer.
The DU determines whether the helicopter is flying TO or FROM the
navigation source when tuned to a VOR.
A loss of reliable heading information from the AHRS, or a loss of
reliable bearing information from the NAV receiver does not display the
TO/FROM indicator or when the FMS is selected does not display the
TO/FROM indicator.
• VOR DEVIATION
The course deviation scale is ±10° when VOR is the selected Primary
Navaid.
• DISTANCE READOUT
When a VOR/LOC receiver is selected as the primary NAV source and
a valid DME station is available, the corresponding DME distance (in
Nautic Miles) is displayed. When the DME is tuned to a station that is
not collocated with the selected VOR, an
H
is annunciated
adjacent to the DME distance to indicate that it is in DME hold mode
and is not synchronized with the VOR.
Above the distance readout, the DME station Ident is displayed, if
properly received