Garmin G1000 Pilot’s Guide for the Piper PA-32 Saratoga
190-02692-00 Rev. A
10
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
AHRS no-GPS
Mode
AHRS coast-on-gyros
until invalid
AHRS Normal
Mode
AHRS no-Mag
Mode
AHRS no-Mag/
no-Air Mode
Heading Invalid
Heading Invalid
Attitude/Heading Invalid
YES
YES
YES
NO
NO
NO
Air Data Available and Reliable?
Mag Data Available and Reliable?
YES
NO
Mag Data AND Air Data
Available and Reliable?
GPS Data Available and Reliable?
Attitude/Heading Invalid
Figure 1-8 AHRS Operation
AHRS FAILURE
Failure of the internal AHRS inertial sensors may result in loss of attitude and heading information (indicated
by red ‘X’ flags over the corresponding flight instruments).
GPS INPUT FAILURE
NOTE:
In-flight initialization of AHRS, when operating without any valid source of GPS data and at true
air speed values greater than approximately 200 knots, is not guaranteed. Under these rare conditions, it
is possible for in-flight AHRS initialization to take an indefinite amount of time, which would result in an
extended period of time where valid AHRS outputs are unavailable.
The system provides two sources of GPS information. If a single GPS receiver fails, or if the information
provided from one of the GPS receivers is unreliable, the AHRS seamlessly transitions to using the other GPS
receiver. An alert message informs the pilot of the use of the backup GPS path. If both GPS inputs fail, the
AHRS continues to operate in Reversionary No-GPS Mode, so long as the air data and magnetometer inputs
are available and reliable. Unavailable or unreliable air data or magnetometer data in addition to GPS failure
results in loss of all attitude and heading information.
MAGNETOMETER FAILURE
If the magnetometer input fails, the 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’).
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