190-00820-08 Rev. A
Cirrus Perspective
™
by Garmin – Pilot’s Guide for the SR20/SR22/SR22T
33
SYSTEM OVERVIEW
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
Reference Field (IGRF). The IGRF is a mathematical model that describes the Earth’s main magnetic field and
its annual rate of change. The database is updated approximately every five years. See the Appendices for
information on updating the Magnetic Field Variation Database. The system will prompt the pilot on startup
when an update is available. Failure to update this database could lead to erroneous heading information being
displayed to the pilot.
GPS RECEIVER OPERATION
Each GIA 63W 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 PFD.
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
is automatically coupled to the PFD. “BOTH ON GPS 1” or “BOTH ON GPS 2” are then 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.
Viewing GPS receiver status information:
1)
Turn the large
FMS
Knob on the MFD to select the Auxiliary Page Group (see Section 1.6 for information on
navigating MFD page groups).
2)
Turn the small
FMS
Knob to select AUX - GPS Status Page.
3)
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.
Summary of Contents for Cirrus Perspective SR20
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