Method and a device for performing a health check of a turbine engine of an aircraft having at least one such engine

A method of performing a health check of at least one turbine engine for monitoring of an aircraft having a rotary wing, said engine having a gas generator and a turbine assembly comprising at least one turbine, in which method:

• during an acquisition step (STP1) of the health check, said aircraft is stabilized and the monitoring value is acquired of at least one monitoring parameter (T45, TET, Tq, Ng) of said engine;
• and
• during an evaluation step (STP2) of the health check, at least one operating margin of the engine is determined by comparing said monitoring value with a limit value defined by the manufacturer;
• wherein:
• during a development step (STP0) performed before the acquisition step and the evaluation step, the effects of mounting the engine in said aircraft are evaluated for a plurality of test values for a reduced speed of reduction (Ng′) of said gas generator, said reduced speed of rotation (Ng′) being equal to the speed of rotation (Ng) of the gas generator modulated by the outside temperature (T0) of the surroundings of said aircraft, said plurality of test values ranging from a minimum test value to a maximum test value;
• during said acquisition step (STP1):
• a) the speed of rotation of said gas generator is increased until said engine develops a maximum power;
• b) said speed of rotation of the gas generator is reduced until the reduced speed of rotation (Ng′) reaches a test value;
• and
• c) the aircraft is stabilized by keeping said reduced speed of rotation (Ng′) constant for a stabilization duration defined by the manufacturer and each monitoring value is acquired;
• and
• during said evaluation step (STP2) of the health check, at least one operating margin is determined by using a monitoring value and the installation losses corresponding to the reduced speed of rotation at which the aircraft is stabilized, and an operator is supplied with each operating margin;
• and
• during a treatment step (STP3), the engine is overhauled if said operating margin is less than a limit threshold defined by the manufacturer.