OPERATOR’S MANUAL
CMA-9000 FLIGHT MANAGEMENT SYSTEM
NAVIGATION OF DIRECT-TO WITH INTERCEPT
When the Intercept Course function is executed (EXEC key pressed), which may be performed either on the
ground or airborne, the navigation and guidance data output by the FMS (desired track, track angle error,
crosstrack distance) are relative to the specified intercept course inbound to the waypoint. The mode used is
dependent on the aircraft installation. The FMS initially enters a Track Hold mode (TRK configuration) or a
Heading Hold (HDG configuration) mode or keeps the wings level (LEVEL configuration) prior to capturing the
intercept leg.
A. When configured for constant track (TRK), or constant heading (HDG), the FMS enters the Track/Heading
Hold mode when the following conditions are satisfied (refer to Figure 9-1):
• The direct-to/intercept function has been executed (EXEC key pressed).
• The aircraft is airborne and on a valid intercept track/heading.
• The LNAV mode of the autopilot/flight director (AP/FD) system is engaged.
The order in which the conditions occur is not important. When all three conditions are satisfied, the current
aircraft track/heading is maintained until the intercept leg is captured by the lateral steering function of the
FMS, or until LNAV is disengaged. If LNAV is disengaged and a new track/heading is established,
re-engaging LNAV will cause the FMS to maintain the new track/heading.
When the FMS is in Track/Heading Hold mode, continuous checks are performed by the FMS to determine
if the intercept is achievable. These checks are performed when Track/Heading Hold is first activated and
are repeated periodically until the leg is captured by the FMS steering function.
Cancellation of Track/Heading Hold occurs under the following conditions:
CAUTION: Paragraph 1. below may result in a small track/heading change.
1. If the predicted intercept point is very close (e.g. less than 0.1 nm) to the leg's termination waypoint and
the airplane is turned from a valid heading intercept, then a path is calculated direct-to the waypoint and
a DIRECT TO FIX alert message is displayed. The display of guidance data remains relative to the
intercept course.
Page 9-4
August 17, 2010
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