| 摘要 |
The navigation of an aircraft is facilitated through the displaying on a map of the region overflown, of the limits of zones within range of the aircraft in an emergency situation (case of engine failure, loss of pressurization, etc.). The points of the zones within range of the aircraft are tagged on the basis of an estimate of the vertical margins remaining to the aircraft if it were to reach these points, having regard to zones of nonmanoeuvrability to be circumvented in the neighbourhood of the current position of the aircraft, of a vertical flight profile to be complied with and of a safety height margin to be complied with.
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