190-02177-02 Rev. A
Garmin G1000 NXi Pilot’s Guide for the Cessna NAV III
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL
FEA
TURES
APPENDICES
INDEX
15
SYSTEM OVERVIEW
AIR DATA INPUT FAILURE
A failure of the air data input has no effect on ADAHRS/AHRS output while ADAHRS/AHRS is operating in
normal mode. A failure of the air data input while the ADAHRS/AHRS is operating in reversionary No-GPS
mode results in invalid attitude and heading information on the PFD (as indicated by red “X” flags).
MAGNETOMETER FAILURE
If the magnetometer input fails, the ADAHRS/AHRS transitions to one of the reversionary No-Magnetometer
modes and continues to output valid attitude information. However, if the aircraft is airborne, the heading
output on the PFD does become invalid (as indicated by a red “X”).
GPS RECEIVER OPERATION
Each IAU Integrated Avionics Unit (IAU) contains a GPS receiver. Information collected by the specified
receiver (GPS1 for the #1 IAU or GPS2 for the #2 IAU) may be viewed on the ‘Aux - GPS Status’ Page.
Internal system checking is performed to ensure both GPS receivers are providing accurate data to the system.
In some circumstances, both GPS receivers may be providing accurate data, but one receiver may be providing a
better GPS solution than the other. In this case the GPS receiver producing the better solution is automatically
coupled to the PFD.
GPS sensor annunciations are most often seen after system power-on when one GPS receiver has acquired
satellites before the other, or one of the GPS receivers has not yet acquired a SBAS signal. While the aircraft
is on the ground, the SBAS signal may be blocked by obstructions causing one GPS receiver to have difficulty
acquiring a good signal. Also, while airborne, turning the aircraft may result in one of the GPS receivers
temporarily losing the SBAS signal.
If the sensor annunciation persists, check for a system failure message in the ‘Alerts’ Window on the PFD. If
no failure message exists, check the ‘Aux - GPS Status’ Page and compare the information for GPS1 and GPS2.
Discrepancies may indicate a problem.
Viewing GPS receiver status information:
1)
Use the large
FMS
Knob to select the Auxiliary Page Group (see Section 1.4 for information on navigating MFD
page groups).
2)
Use the small
FMS
Knob to select ‘Aux - GPS Status’ Page.
Selecting the GPS receiver for which data may be reviewed:
1)
Use the
FMS
Knob to select the ‘Aux - GPS Status’ Page.
2)
To change the selected GPS receiver:
Press the desired
GPS
Softkey.
Or:
a)
Press the
MENU
Key.
b)
Use the
FMS
Knob to highlight the receiver which is not selected and press the
ENT
Key.
