Section 7 IFR Procedures
7-14
IDU-450 EFIS Software Version 8.0H (Rotorcraft)
1
st
Ed Nov 2018
Figure 7-7: Highway in the Sky Final Approach Segments
7.3.2. Waypoint
Sequencing
When automatic waypoint sequencing is suspended due to reasons 1, 2,
or 4 in § 7.3, the EFIS switches from “TO” to “FROM” operation when
appropriate. If not suspended, automatic waypoint sequencing occurs in
following conditions:
1) Bearing to the transition point (turn bisector for fly-by waypoint, active
waypoint for fly-over waypoint) is more than 90° from the current course
(i.e., transition from “TO” to “FROM” operation);
2) Aircraft location is within two turn diameters (based upon current true
airspeed and 15° angle of bank) of the active waypoint location; and
3) Aircraft is within 90° of the current course (i.e., generally pointed in the
correct direction).
The desired flight path is created from a sequence of straight, left turning,
and right turning leg segments designed to provide smooth skyway,
GPS/SBAS CDI, and lateral autopilot guidance. Each leg between
waypoints is composed of up to nine segments. Otherwise, radii for turning
segments (other than DME arc or radius to a fix segments) are calculated
with the parameter speed determined as follows:
1) If the waypoint is part of a DP and within 30 NM of the departure
runway, speed is the preprogrammed procedure speed.
2) If the waypoint is part of a STAR and within 30 NM of the arrival runway,
speed is the preprogrammed procedure speed.
