OPERATIONS MANUAL

Navigation Systems
Inertial Reference System:
In ATT mode, the IRU provides the following data:
Pitch angle
Roll angle
Pitch rate
Roll rate
Body pitch rate
Body roll rate
Body yaw rate
Body longitudinal acceleration
Body lateral acceleration
Body normal acceleration
Vertical acceleration
Inertial vertical speed (requires pressure altitude input from ADC)
Inertial altitude (requires pressure altitude input from ADC)
Platform heading (requires pilot inputs)
In NAV mode, the IRU provides the same data as in ATT mode, plus:
Magnetic* and true heading
Magnetic* and true track (valid when groundspeed is above 80 kt)
Track rate
Drift angle
Flight path angle (valid when groundspeed is above 80 kt)
Flight path acceleration
Along track horizontal acceleration
Cross track horizontal acceleration
East-west velocity
North-south velocity
Groundspeed
Present latitude-longitude position
Wind direction and wind speed (requires TAS input from ADC)
* Each IRU uses the computed present position and a global database to
determine the local magnetic variation.
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