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190-00728-04 Rev. A
Embraer Prodigy
®
Flight Deck 100 Pilot’s Guide
31
SYSTEM OVERVIEW
Figure 1-24 System Failure Annunciations
GDC 74B Air
Data Computer
GTX 33/D Transponder
Or
GIA 63W Integrated
Avionics Units
GDC 74B Air
Data Computer
GEA 71 Engine
Airframe Unit
GIA 63W Integrated
Avionics Units
GIA 63W Integrated
Avionics Units
GIA 63W Integrated
Avionics Units
FADEC
Pressure Controller
GEA 71 Engine
Airframe Unit
& GSD 71 Data
Concentrator
FADEC
GIA 63W Integrated
Avionics Units &
GEA 71 Engine
Airframe Unit
KRA 405B Radar
Altimeter or GIA
63W Integrated
Avionics Units
GRS 77 AHRS
Or
GMU 44
Magnetometer
GPS RECEIVER OPERATION
Each GIA 63W Integrated Avionics Unit (GIA) contains a GPS receiver. Information collected by the specified
receiver (GPS1 for the #1 GIA or GPS2 for the #2 GIA) may be viewed on the AUX - GPS Status Page.
GPS1 provides information to the pilot-side PFD and GPS2 provides data to the copilot-side PFD. Internal
system checking is performed to ensure both GPS receivers are providing accurate data to the PFDs. In some
circumstances, both GPS receivers may be providing accurate data, but one receiver may be providing a better
GPS solution than the other receiver. In this case the GPS receiver producing the better solution will be
automatically coupled to both PFDs. “BOTH ON GPS 1” or “BOTH ON GPS 2” will then be displayed in the
Reversionary Sensor Window (see Appendix A) indicating which GPS receiver is being used. Both GPS receivers
are still functioning properly, but one receiver is performing better than the other at that particular time.
These GPS sensor annunciations are most often seen after system power-up when one GPS receiver has
acquired satellites before the other, or one of the GPS receivers has not yet acquired an SBAS (Satellite Based
Augmentation System) 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 Messages Window on the PFD.
If no failure message exists, check the GPS Status Page and compare the information for GPS1 and GPS2.
Discrepancies may indicate a problem.