Abstract: An aircraft performance degradation detection system may include information sources, a central unit connected to the information sources, and a warning device that is connected to the central unit. Using information received from the information sources, the central unit computes the current weight and drag of the aircraft and computes a theoretical drag based on the current weight. The current and theoretical drags are compared, and a determination is made regarding performance degradation based on the comparison.

Abstract: The device (1) comprises a set (2) of information sources, a central unit (3) connected to said set (2) of information sources and able to detect a degradation of performance of an aircraft, and warning means (5) connected to the central unit (3), said central unit (3) comprising means (7, 8) for computing at least one current weight and a current drag of the aircraft and, on the basis of said current weight, a theoretical drag of said aircraft, means (10) for implementing at least one first set of comparisons, which relates to the drag and which comprises at least one comparison between said current drag and said theoretical drag, and means (12) for determining whether a degradation of performance of the aircraft exists, at least on the basis of said first set of comparisons.