OPERATOR’S MANUAL
CMA-9000 FLIGHT MANAGEMENT SYSTEM
D. Inertial
The FMS inertial navigation mode is based on the following parameters:
• Present Position Latitude and Longitude;
• North-South velocity;
• East-West velocity.
The FMS uses the raw Inertial position and velocities provided by the IRS.
When the FMS is interfaced with 3 IRS, the resulting inertial navigation mode position will be a weighted
average of the 3 IRS raw inertial positions.
E. Dead Reckoning (DR)
When the external sensor data inputs become insufficient to maintain the normal navigation modes, the
FMS reverts to the dead reckoning mode of navigation. The FMS must then rely on the last known aircraft
position, combined with heading and TAS inputs, and the last valid computed wind, for its aircraft position
calculation. Prolonged DR operation will result in decreased position accuracy. Alerts are provided when
the estimated position accuracy exceeds the requirements for each phase of flight.
Refer to Section 12 for additional information on the various FMS navigation modes.
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August 17, 2010
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