System failure
Failure of the basic GPWS is detected by the Integrated Alerting Unit and the relevant alert is
presented.
NOTE: The GPWS fault light is delayed for 60 seconds by the Integrated Alerting
Unit.
Failure of the TAWS Display Unit is indicated by a small @ indicator located between the
range buttons on the Display Unit. When illuminated the information displayed should not be
used. Failure of the display unit does not affect the EGPWS/TAWS system.
A TAWS p/b is installed at each pilot's MAIN INSTRUMENT PANEL. The amber TAWS light
in the TAWS p/b indicates a failure of the TAWS. The INHIBIT light will illuminate to indicate
that the system is manually inhibited.
NOTE:
• Switching OFF the GPWS p/b will cancel all aural warnings generated by
EGPWS, visual alerts are however still generated.
• Basic GPWS mode 1 thru 6 will remain functional when switching off
TAWS.
Fokker 50 - Flight Navigation Instruments
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