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5-36
Rev 1
5.9.4 Switching From The Leg Mode To The OBS
Mode
The following mode transition occurs if the KLN 90B is
in the Leg mode and the mode is changed to the OBS
mode:
1.The waypoint that was active in Leg mode prior to
the mode change remains the active waypoint in
OBS mode.
2.The selected course is defined by two different meth-
ods depending on the installation and the status of
the unit.
i. If the KLN 90B is the displayed navigation
source when the change is made to OBS mode, then
the selected course becomes whatever was set on
the external indicator prior to changing to the OBS
mode. This value should normally be the desired
track to the active waypoint if you had the external
indicator set to the correct value prior to switching to
the OBS mode.
ii. If the KLN 90B is interfaced with compatible
EFIS systems, a compatible mechanical HSI
interfaced through a KA 90 adapter, or if the KLN
90B is not displayed on the external indicator, then
the selected course is chosen such that the deviation
from the selected course remains the same.
3.If the OBS value chosen by default from rule 2 above
is unacceptable, you can always define the desired
course by the methods described in section 5.9.3.
5.9.5 Switching From The OBS Mode To The Leg
Mode
The following mode transition occurs if the KLN 90B is
in the OBS mode and the mode is switched to the Leg
mode:
1.The waypoint that was active while in the OBS mode
remains the active waypoint when the Leg mode is
activated. The system does not attempt to orient
itself on a leg of the active flight plan unless the
TO/FROM indicator is indicating FROM. In this case
the KLN 90B will reorient on the active flight plan.
2.The selected course (OBS) that was active in the
OBS mode prior to switching to a Leg mode
becomes the desired track (DTK) in the Leg mode,
unless the switch was made on the “from” side in
which case the KLN 90B will calculate the correct
desired track for the new leg.
3.With the exception of #2 above, the characteristics of
normal Direct To operation apply.