The same situation exist for visual approaches that are conducted using descent paths below
a normal 3 degree approach slope.
Altimeter setting alert
The aural alert “ALTIMETER SETTING, ALTIMETER SETTING” is issued to provide an
informational alert to the crew making them aware of an altimeter problem or failure.
The alert occurs under the following conditions:
• Barometric altitude from the ADC is significantly higher than terrain elevation plus radio
altitude.
• Barometric altitude from the ADC is significantly higher than GPS altitude.
• ADC errors or failure.
This annunciation can occur when the difference is as little as 200 feet depending on terrain
database resolution and GPS geometry.
NOTE:
This aural alert is an advisory. Crew should check barometric altimeter for
proper setting.
The alert is inhibited when the indicated altitude is greater than 18.000 feet or when the
altimeter setting is 1013 mbar.
Fokker 50 - Flight Navigation Instruments
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