Abstract: A method for monitoring the coherence of an atmospheric pressure value to be used for configuring flight instruments of an aircraft includes: interrogating a database to obtain an altitude value of a selected airport; obtaining a static pressure value, a static temperature value, and a geometric altitude value, corresponding to a current situation of the aircraft; deducing therefrom an estimate of a static pressure value at the selected airport; evaluating a coherence level between the estimate and the atmospheric pressure value to be used for configuring the flight instruments of the aircraft; and generating a warning if the coherence level is below a predefined threshold.

Abstract: A system for detecting the presence of ice in a total-air-temperature probe with which an aircraft is equipped monitors the slope of total-air-temperature measurements carried out by the total-air-temperature probe, and monitors the slope of a temperature differential, which is the difference between a static-air-temperature value and a temperature value according to the ISA model, determined depending on the altitude of the aircraft. The presence of ice in the total-air-temperature probe is detected when the total air temperature measured by the total-air-temperature probe exhibits a positive slope higher than a first predefined positive threshold and when in addition the temperature differential simultaneously exhibits a positive slope higher than a second predefined positive threshold. Thus, the detection of the presence of ice is possible whatever the flight phase of the aircraft.