Detecting an incorrect altimeter setting

A system comprising:

• a pressure altimeter;
• a communications device;
• processing circuitry installed on a first aircraft, the processing circuitry in signal communication with the pressure altimeter and the communications device, wherein the processing circuitry is configured to:
• receive a barometric pressure setting for the pressure altimeter on the first aircraft;
• receive via the communications device, a plurality of barometric pressure settings from a plurality of aircraft, wherein the plurality of aircraft does not include the first aircraft;
• calculate a measure of central tendency for the plurality of barometric pressure settings;
• compare the barometric pressure setting for the first aircraft to the measure of central tendency of the plurality of barometric pressure settings;
• determine that the barometric pressure setting for the first aircraft is different by more than a threshold amount from the measure of central tendency of the plurality of barometric pressure settings;
• and
• in response to determining that the barometric pressure setting for the first aircraft is different from the measure of central tendency of the plurality of barometric pressure settings, generating an output indicating that the barometric pressure setting for the first aircraft is different from the measure of central tendency of the plurality of barometric pressure settings.

A computer-readable storage medium comprising instructions for causing programmable processing circuitry to:

• receive a barometric pressure setting for a pressure altimeter on a first aircraft, wherein the programmable processing circuitry is installed on the first aircraft and in signal communication with the pressure altimeter, a communications device and an output device, each of which is installed on the first aircraft;
• receive via the communications device, a plurality of barometric pressure settings from a plurality of aircraft, wherein the plurality of aircraft does not include the first aircraft;
• calculate a measure of central tendency for the plurality of barometric pressure settings;
• compare the barometric pressure setting for the first aircraft to the measure of central tendency of the plurality of barometric pressure settings;
• determine that the barometric pressure setting for the first aircraft is different by more than a threshold amount from the measure of central tendency of the plurality of barometric pressure settings;
• and
• in response to determining that the barometric pressure setting for the first aircraft is different from the measure of central tendency of the plurality of barometric pressure settings, generating an output indicating that the barometric pressure setting for the first aircraft is different from the measure of central tendency of the plurality of barometric pressure settings.