Beechcraft C-12C Operator And Technical Reference Manual page 191

displayed on the page at one time.
intermediate waypoints, turn the left cursor function on
and use the left outer knob to manually scroll through
all the waypoints. If scrolling is performed all the way
to the end of the flight plan, a blank waypoint position
will exist so that a waypoint may be added to the end
of the flight plan.
ah. Turn Anticipation And Waypoint Alerting.
Prior to reaching a waypoint in the active flight plan,
the KLN 90B will provide navigation along a curved
path segment to ensure a smooth transition between
two adjacent legs in the flight plan. Refer to Figure
3-43. This feature is called turn anticipation.
transition course is based upon the aircraft's actual
groundspeed and the amount of course angle change
between the two legs. The KLN 90B automatically
sequences to the next leg after passing the midpoint in
the transition segment.
W P T 2
—
—
W P T
Figure 3-43. Turn Anticipation
Approximately 20 seconds prior to the beginning
of turn anticipation, the arrow preceding the active
waypoint identifier will begin flashing on the FPL 0
page and on any Navigation page, Distance/Time
page, or Waypoint page displaying the active waypoint
identifier. On the Super NAV 5 page, the entire
waypoint identifier will start to flash.
waypoint alert annunciator will begin flashing at the
same time. This is called waypoint alerting.
To utilize the turn anticipation feature, start the
turn transitioning to the next leg in the flight plan at the
very beginning of turn anticipation. This occurs when
the external waypoint alert annunciator or the active
waypoint identifier on the Super NAV 5 page stops
flashing and goes on steady. At this time, the KLN
90B will generate a message on the message page for
the new desired track to select on the HSI: ADJ NAV
o
IND CRS TO 123 . A message will not be given if the
change in desired track is less than 5° or the KLN 90B
To view
—
W P T 3
1
The external
is interfaced with an HSI having a course pointer that
is automatically slewed to the correct desired track.
The desired track displayed on the NAV 3 page
also changes to the value of the next leg at the
beginning of turn anticipation.
becomes inactive when transition to the next leg has
been made.
The KLN 90B can read the selected course set
on the external HSI. The KLN 90B will flash the value
of the desired track on both the NAV 3 and the Super
NAV 5 pages when the desired track and the selected
The
course differ by more than 10°.
course to match the desired track. This will ensure
that the orientation is always pictorially correct.
If desired, turn anticipation may be disabled, or
enabled, on the SET 6 page.
ai. Viewing The Waypoint Pages For The
Active Flight Plan Waypoints. The waypoint pages
for each of the waypoints in the active flight plan may
be displayed by selecting the Active Waypoint page
with the right outer knob. Refer to Figure 3-44. When
the ACT page is first selected, the waypoint page for
the active waypoint will be displayed. The sequence
number of the waypoint in the flight plan is
annunciated with a number to the left of the identifier.
An arrow to the left of the waypoint number designates
the active waypoint. The letter to the far right of the
identifier designates the type of waypoint: A – airport,
V – VOR, N – NDB, I – intersection, S – supplemental,
or T – terminal. For VOR's having DME capability, the
letter D is displayed between the VOR identifier and
the V.
1:KNEW
2:GPT
3:SJI
4:CEW
5:MAI
8:KPIE
FPL 0
Figure 3-44. The Active Waypoint Page
To view the other waypoints in the flight plan,
pull the right inner knob to the "out" position and turn it
to view each of the waypoints in the order they are in
the active flight plan. For airport waypoints, the right
inner knob may be pushed back to the "in" position
and rotated to display any of the eight airport pages.
TM 1-1510-218-10
Turn anticipation
Set the selected
2 GPT D V
GULFPORT
109.00
N 30 o 24.40'
W 89 o 04.60'
ENR - LEG
L
2 o E
ACT
3-37