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13.2 Turn Anticipation And Waypoint Alerting
Prior to reaching a waypoint in the active flight plan, the KLN 90B will pro-
vide navigation along a curved path segment to ensure a smooth transi-
tion between two adjacent legs in the flight plan. That is, the CDI or HSI
left/right deviation will be referenced to the dashed line in the following
figure. This feature is called turn anticipation. The 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 seg-
ment.
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 way-
point identifier. The active waypoint identifier will
start to flash on the Super NAV 5 page. This is
called “waypoint alerting”. If an external waypoint
alert annunciator is mounted in the aircraft, this
annunciator will begin flashing at the same time.
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 desired track (DTK) displayed on the NAV 3 or Super
NAV 5 page changes to the value for the next leg. A message prompt
also begins flashing at the beginning of turn anticipation. When the mes-
sage is viewed, it states: ADJ NAV IND CRS TO XYZ°, where XYZ is the
new course you should select on the HSI or CDI.
Note: This message is
not displayed if the KLN 90B is interfaced with an EHSI or HSI having a
course pointer automatically slewed to the correct desired track by the
KLN 90B.
The beginning of turn anticipation is also indicated when the
external waypoint alert annunciator stops flashing and goes on steady.
Turn anticipation becomes inactive when transition to the next leg has
been made.
If desired, turn anticipation may be disabled (or enabled) on the Setup 6
page (SET 6) using the left C and the left inner knob to select between
DISABLE or ENABLE. If turn anticipation is disabled, navigation is pro-
vided all the way to the waypoint and waypoint alerting occurs approxi-
mately 36 seconds prior to actually reaching the waypoint.
13.3 Viewing The Waypoint Pages For The Active Flight Plan
Waypoints
The waypoint page(s) for each of the waypoints in the active flight plan
may be easily displayed by selecting the Active Waypoint page (ACT)
type on the right side. When the ACT page type is first selected, the way-
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