MODE 6: Altitude callouts
The advisory “FIVE HUNDRED” and “FIFTY” will be generated at that radio altitude above
the terrain.
Bank angle callouts
TAWS will monitor the aircraft bank angle and issue a “
BANK ANGLE
” aural alert when the
35° bank angle limit is reached. If the aircraft continues past the limit and reaches a bank
angle equal to 20 percent greater than the configured setting, a second aural alert will be
issued. Decreasing the bank angle to 20 percent less than the configured setting will reset
the alert.
Minimums & approaching minimums
TAWS receives an input from EFIS control panel and the radio altimeter when the minimum
altitude set at the EFIS control panel is reached. This input to TAWS generates the aural
annunciation “APPROACHING MINIMUMS” and “MINIMUMS”. This feature only occurs
during approach and may only occur once per approach.
Aural and visual alert messages
TAWS alerts are listed in the table below. All TAWS alerts should be considered valid and
the crew will react to all aural alerts, associated annunciators and TAWS display pop-ups.
Any annunciation or aural alert requires appropriate action. Loss of any one or two aural or
visual caution alert indications does not decrease the validity of the alert. The amber TERR
and BELOW G/S annunciators indicate cautions and require immediate attention if the
condition continues. The red PULL UP annunciator constitutes a TAWS warning and
requires immediate aggressive action by the pilot.
Perceived nuisance alerts shall be brought to the attention of maintenance for analysis.
Noting location, barometric altitude, aircraft configuration and alert annunciations (aural and
visual) would prove helpful in the analysis.
If a forward looking terrain alert is previously determined to be erroneous and is repetitive at
a specific location, the terrain alerting function can be inhibited by activating the TERRAIN
INHIBIT
switch.
NOTE:
Aural messages associated with alerts are prioritized to avoid the confusion
of multiple and simultaneous alerts occurring.
Fokker 50 - Flight Navigation Instruments
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