OPERATOR’S
MANUAL
CMA-9000 FLIGHT MANAGEMENT SYSTEM
Page
11-38
Revision 1 December 08, 2009
NAVIGATION OF DIRECT-TO A WAYPOINT WHEN CMA-9000 FMS IS CONFIGURED FOR A "MOVING
DTK" DIRECT-TO
When Direct-To a waypoint procedure is executed the CMA-9000 FMS provides Roll steering, track angle error
and lateral deviation guidance to the FD/AP based on the aircraft present position and track.
Initially the CMA-9000 FMS uses the bearing from the aircraft position to the Direct-To waypoint as the intercept
course, because the aircraft position is changing the intercept course changes. The aircraft remains on the variable
intercept course and consequently the lateral deviation is kept centered until the track angle error becomes smaller
than +/-2 degrees. During this phase the aircraft is flown using the roll steering (the lateral deviation does not yet
convey useful information).
When the track angle error becomes smaller than +/-2 degrees the intercept course becomes fixed in space. The
lateral deviation varies according to the aircraft position and can now be used for guidance along with the roll
steering command.
Figure 11-6 illustrates the Direct-To a waypoint procedure, including the expected desired track and lateral
deviation indications on the HSI at points of interest along the procedure.
0703004
00
33
30
27
24
21
18
15
12
09
06
03
WP2
WP1
PPOS
When TKE < 2 degrees
intercept course is fixed;
deviation needle is
according to aircraft
position
00
33
30
27
24
21
18
15
12
09
06
03
When TKE > 2 degrees
intercept course is variable;
deviation needle is
centered
00
33
30
27
24
21
18
15
12
09
06
03
Direct-To
executed at
this point
Figure 11-6 "Moving DTK" Direct-To a Waypoint Procedure
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