f. Direct-To Operations.
(1) Direct-To Overview. Direct-To courses
are used to either bypass existing waypoints in the
flight plan or to insert an impromptu waypoint,
interrupting the current leg. In each case a system
generated turn point is used to calculate the course to
the newly selected active waypoint. This systems
generated turn point provides turn anticipation and
prevents S turns during capture of the new course.
The systems generated turn point is calculated
internally and not displayed to the operator. The
Direct-To function differs from simple active waypoint
entry by the course being set from the aircraft position
rather than from the last history waypoint. When used
during Vertical Navigation (VNAV), the Direct-To
function computes an immediate climb or descend
path to a waypoint with an altitude crossing assigned.
When the DIR line select key is pressed, the
Flight Plan page is accessed with DIR TO [ ] displayed
on the top line. Refer to Figure 3B -40 and Table
After selecting a waypoint for the Direct-To
operation, the normal Flight Plan page display will
Figure 3B-40. Direct-To Line Select Key
Table 3B-31. Direct-To Line Select Key
Press Direct Function Key - DIR.
DIR TO [ ] label remains on line 1 as
waypoints are scrolled to indicate that only
Direct-To operations are possible.
Flight plan edits (i.e., waypoint insertion and
deletion, and labeling) are permitted.
(2) Direct-To Flight Plan Waypoints. A
Direct-To course may be initiated to any existing flight
plan waypoint including the history waypoints. DIR TO
[ ] remains on the top line as the flight plan is scrolled
to indicate that Direct-To selections may be made.
Refer to Figure 3B-41 and Table 3B-32. If the
waypoint selected for the Direct-To operation is a
future waypoint the intermediate waypoints are
bypassed and moved into the flight plan history list (up
to 39 waypoints). If the selected waypoint is a history
waypoint, the history waypoints following the Direct-To
waypoint are moved into the future flight play list and
repeated in their original sequence. If any manual
edits were made to the courses between flight plan
points, they will be reset to the original courses once
they become history points.
A Direct-To to the MAP of an approach
procedure is prohibited. The FMS must sequence
through the FAF waypoint for the MAP to become the
If the pilot has selected the FMS navigation
source on the Electronic Horizontal Situation Indicator
(EHSI), the Direct-To course may also be activated to
the current active waypoint by momentarily pressing
the CRS select knob on the Flight Display System
(FDS) control panel. This single action Direct-To
capability is useful in situations where the pilot must
deviate from a course and wishes to proceed directly
to the waypoint. It is also useful in terminal area
maneuvering in conjunction with GPS data based
The FMS-800 creates a Direct-To course
between the turn anticipation point directly
ahead of aircraft present position and the
selected direct-to waypoint. When the
change in the resulting course is greater
than 150°, the FMS will provide guidance to
turn and intercept this course, resulting in
an S-turn maneuver to the course.
(3) Direct-To DME Arc Procedure. A Direct-
To a future or history waypoint that is the endpoint of a
DME arc will cause the FMS to intercept the arc along
the DME arc leg. To fly directly to the waypoint
without intercepting the arc, select Direct-To the DME
Arc endpoint again while it is the active waypoint to
override the DME Arc leg intercept.