ALTIMETER ALTITUDE ALERT
General
If the altitude is 1000 feet below or above the selected altitude, an altitude entry alert is
presented. If the altitude deviates from the selected altitude by more than 250 feet, an
altitude exit alert is presented. The ALT ALERT light at the CAP remains on until the aircraft
returns within 250 feet of the selected altitude.
Operation
For the altitude pre-select and alert functions the alert controller obtains barometrically
corrected altitude information from the captain or first officer’s altimeter. AP COMMAND
buttons at the FMP determine which altimeter will supply the alert controller. The selected
altitude can be set at the flight mode panel installed in the glare shield. Selection is possible
between zero and 50.000 feet in increments of 100 feet. Before initial selection, a dashed
line is shown. Initial selection shows the actual aircraft altitude to proceed from. When the
alert controller fails, the display will be blank.
Inhibit phases
In addition to the inhibit phases as controlled by the integrated alerting system, no alert is
presented when the selected altitude is being changed, or when the glide slope capture
mode is supplied by the coupled flight director.
Fokker 50 - Flight Navigation Instruments
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