When flying decoupled, the pilot flies the helicopter to satisfy Flight Director
Commands as programmed on the Flight Director Control Panel.
When in this mode, the pilot should either center the commands or go to
standby on his mode controller.
When flying coupled, the aircraft is automatically flown in pitch and roll to
satisfy Flight Director Commands.
VOR operation
NAV MODE
CAUTION
VOR approaches in NAV mode are prohibited.
VOR approaches are permitted in VOR APP mode.
The NAV mode is designed for cross-country operation and localizer/glide
slope approaches and any radial capture in this mode should be effectuated
more than 15 NM from the station.
When flying near a VOR station the flight director senses the ″Cone of
Confusion″ and automatically switches to Over Station Sensor Logic at which
time course deviation signal is ignored and the system will fly course arrow
heading for a fixed time to allow for station passage. This system can cause
significant course deviation prior to termination of Over Station Sensor Logic;
therefore it is recommended to use the HDG Mode near the station.
VOR APP MODE
The VOR APP Mode is designed for operating radial captures less than 15 NM
from the station and to permit VOR approaches.
Very near to the station oscillations could occur around the tracked radial.
If the oscillations are undesirable, use HDG mode.
RFM A109E
R.A.I. Approved 2-41
Rev. 2
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