Garmin Legacy Software Versions Podręcznik Użytkownika Pobierz pdf (Strona 28)

190-00498-00 Rev. A

Garmin G1000 Pilot’s Guide for Cessna Nav III

1-14

SYSTEM OVERVIEW

AHRS OPERATION

In addition to using internal sensors, the GRS 77

AHRS uses GPS information, magnetic ﬁeld data and

air data to assist in attitude/heading calculations. In

normal (primary) mode, the AHRS relies upon GPS and

magnetic ﬁeld measurements. If either of these external

measurements is unavailable or invalid, the AHRS uses air

data information for attitude determination. Four AHRS

modes of operation are available (see table below) and

depend upon the combination of available sensor inputs.

Loss of air data, GPS, or magnetometer sensor inputs is

communicated to the pilot by message advisory alerts.

GPS Input Failure

The G1000 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 valid.

AHRS Mode

Available AHRS Functions Available Sensor Inputs

Pitch Roll Heading

GPS Input

(At least one)

GMU 44

Magnetometer

GDC 74A

Air Data Computer

Normal/Primary X X X X X X

Reversionary:

No GPS

X X X - X X

Reversionary:

No Magnetometer

X X - X - X

Reversionary:

No Magnetometer

No Air Data

X X - X - -

Air Data Input Failure

A failure of the air data input has no effect on AHRS

output while AHRS is operating in normal/primary mode.

A failure of the air data input while the 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 AHRS transitions

to one of the reversionary ‘No Magnetometer’ modes and

continues to output valid attitude information. However,

the heading output on the PFD does become invalid (as

indicated by a red ‘X’).

NOTE: Please refer to the Annunciations and

Alerts Pilot’s Guide for speciﬁc AHRS alert

information.

NOTE: Pilots should be aware that aggressive

maneuvering in any of the three reversionary

modes listed below can degrade AHRS

accuracy.

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