190-01754-01 Rev. 4
FAA Approved AFMS or Supplemental AFM for the Garmin G3X Touch EFIS
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7-3
turn rate tick mark, corresponding to a predicted heading of 18˚ from the current heading. At rates
greater than 4 deg/sec, an arrowhead appears at the end of the magenta trend vector and the
prediction is no longer valid.
The Airspeed Indicator may be displayed as a vertical tape or a round dial. When the Airspeed
Indicator is displayed as a tape, it displays a range of 70 knots on a rolling number gauge using a
vertical tape. Numeric labels and major tick marks are shown at intervals of 10 knots. Minor tick
marks are at intervals of 5 knots. The current airspeed is displayed in the black pointer. The True
Airspeed (TAS) is displayed above the scale in white digits and the Ground Speed (GS) is displayed
below the scale in magenta digits.
The Altimeter may be displayed as a vertical tape or a round dial. When the Altimeter is displayed
as a tape, it displays 400 feet of barometric altitude values at a time on a rolling number gauge using
a moving tape. Numeric labels and major tick marks are shown at intervals of 100 feet. Minor tick
marks are at intervals of 20 feet. The current altitude is displayed in the black pointer. The barometric
pressure setting is displayed below the Altimeter in inches of mercury (in Hg) or hectopascals (hPa)
when metric units are selected.
The Selected Altitude is displayed above the Altimeter in the box indicated by a selection bug symbol.
A bug corresponding to this altitude is shown on the altimeter; if the Selected Altitude exceeds the
range shown on the tape, the bug appears at the corresponding edge of the tape.
The Altitude Alerting function provides the pilot with visual and aural alerts when approaching the
Selected Altitude. Whenever the Selected Altitude is changed, the Altitude Alerter is reset. The
following will occur when approaching the Selected Altitude:
•
Passing within 1000 feet of the Selected Altitude, the Selected Altitude (shown above the
Altimeter) flashes for 5 seconds and an aural tone is generated.
•
When the aircraft passes within 200 ft of the Selected Altitude, the Selected Altitude flashes
for 5 seconds and an aural tone is generated to indicate that the aircraft is approaching the
selected altitude.
•
After reaching the Selected Altitude, if the pilot flies outside the deviation band (±200 Feet of
the Selected Altitude), the Selected Altitude changes to Amber text on a black background,
flashes for 5 seconds, and an aural tone is generated.
The Vertical Speed Indicator (VSI) may be displayed as a tape or an arc segment. The VSI displays
the aircraft vertical speed using a non-moving tape labeled at 500, 1000 and every 1000 fpm up to the
maximum with minor tick marks every 100 feet up to 1000 fpm. The current vertical speed is displayed
using a white arrow along the scale.
7.2 Vertical Deviation Indicators
The Vertical Deviation (Glideslope) Indicator (VDI) appears to the left of the altimeter whenever an ILS
frequency is tuned in the active NAV field of an external navigator. A green diamond acts as the VDI
Indicator. The green 'G' indicates an external glideslope source. If a localizer frequency is tuned and
there is no glideslope signal, “NO GS” is annunciated.
