OPERATOR’S MANUAL
CMA-9000 FLIGHT MANAGEMENT SYSTEM
OPERATION WITH FAILED HEADING INPUT
When the heading input is unavailable, the two main consequences are: the computation of wind is unavailable,
and more importantly, the FMS accuracy may be temporarily degraded during turns exceeding 20 degrees
except when in GPS mode. To prevent this temporary loss of accuracy, it is necessary to manually enter a new
value of track angle each 10 to 20 seconds during a turn and again on completion of the turn. Follow steps 2.
and 3. as described in NAVIGATION IN DEAD RECKONING (DR) MODE, skipping the entry of ground speed
data. The procedure is not required when navigating with a valid GPS position.
When navigating in Dead Reckoning mode with a failed heading input, an entry of a manual heading is
permitted.
MANUAL POSITION UPDATES
Manual position updates can be performed when navigating in Dead Reckoning mode.
The following operator action is required:
1. Prior to reaching a known reference position, get this known reference position coordinates to the scratchpad
by following one of these three methods:
• If the known point is a flight plan waypoint, go to the ACT RTE x LEGS POS 1/X page and line-select the
appropriate waypoint coordinates to the scratchpad;
• If the known point is a NavDataBase element, retrieve its coordinates from the NavDataBase via the NAV
DATA 1/1 page, and line-select them to the scratchpad (LSK 1R);
• Type the coordinates directly into the scratchpad.
2.
Display the POS INIT/REF
1/2 page by pressing [INIT
REF], <POS INIT> (LSK 2L).
3. When directly overhead the known reference position, enter the scratchpad coordinates into the FMS POS
field by pressing LSK 1R. The FMS position is immediately updated to the new coordinates.
POS INIT/REF 1/
FMS POS DR
N47
o
26.28 W122
o
18.67
REF WAYPOINT
KBFI N47
o
31.80W122
o
18.00
UTC DATE
1757:04z OCT20/04
<SETUP
Page 17-5
August 17, 2010
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