Method and device for adjusting performance variables of an aircraft

A device for adjusting performance variables of an aircraft, the device comprising:

• at least one auxiliary data input for entering correction data into a computer and/or the flight management system, the correction data being configured for use in adjusting at least one associated performance variable;
• a checking unit for checking, while the correction data is entered into computer and/or the flight management system, if the entered correction data are in conformity with a set of authorizations and prohibitions, the set of authorizations and prohibitions being predetermined and recorded in a memory, the checking unit also being configured to issue a correction authorization or a correction rejection as a function of whether the entered correction data are in conformity with the set of authorizations and prohibitions;
• and
• a correction unit configured for carrying out a correction comprising adjusting the associated performance variable based on the correction data solely upon issuance of the correction authorization by the checking unit.