To inhibit warning for preventing collision with the ground surface at the time of a normal landing approach by providing a computing means capable of supplying state signals, which are functions of route data and runway data, and selecting the route of an airplane so as to indicate that the route of the airplane converges toward a runway.
A device 3 is, for example, displaying a topographic database file on topographic features. An airport data base file 100 including data to determine verification in each runway in an airport and their accurate locations with desired accuracy and furthermore a standard landing angle and an approach slope angle at each end in a few runways are added to the topographic database file. A device 102 formats a command (state) to reject the device 4. Furthermore, it is generally possible to apply rejection to any given collision prediction warning function CPA. For this purpose, the device 102 receives flight information from the device 2 on one hand, information outputted from an airport database 100 on the other hand, and information forming a rejection constant 101 stored in memory.
LEPERE GERARD
GAUGE VINCENT
LEONARDI ERIC
ROGER CHRISTOPHE
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