Method (11, 21) for analysing variations in at least one indicator of the behaviour of a mechanism (1, 1') equipping an aircraft (2, 2'), said at least one indicator being determined from measurements of at least one physical parameter of operation of said mechanism (1, 1') during a mission of said aircraft (2, 2'), said method (11, 21) comprising at least: • a step of recording (12, 22) said measurements of said at least one physical operating parameter in a storage unit (3, 3'); • a first step of transmitting (13, 23) said measurements of said at least one physical operating parameter contained in said storage unit (3, 3') to a communication station (4, 4') external to said aircraft (2, 2'), said communication station (4, 4') being installed at the premises of an operator of said aircraft (2, 2'); • a second step of transmitting (14, 24) said measurements of said at least one physical operating parameter from said communication station (4, 4') to an analysis centre external to said aircraft (2, 2'), said analysis centre being common to a fleet of aircraft (2, 2') of the same type and being installed at the premises of a manufacturer of said fleet of aircraft (2, 2'); • a step of generating (15, 25) said at least one indicator based on said measurements of said at least one physical operating parameter; • a step of analysing (16, 26) the variations of said at least one indicator; characterised in that said step of analysis of (16, 26) said variations of said at least one indicator is performed from said measurements of said at least one physical operating parameter of at least two separate mechanisms and equipping at least two aircraft and of the same type belonging to at least two separate operators, said analysis centre for analysing said variations of said at least one indicator from a first aircraft belonging to a first operator and said variations of said at least one indicator from a second aircraft belonging to a second operator, said first and second aircraft and being two aircraft of the same type belonging to said fleet of aircraft (2, 2') of said same type, and in that said method comprises a step of detecting (17, 27) a potential problem in the behaviour of said mechanism (1, 1') equipping at least one of said aircraft (2, 2') of said fleet and an alert step (19, 29) allowing for the alerting of said manufacturer of said fleet of aircraft (2, 2') of a potential problem in the behaviour of said mechanism (1, 1') equipping at least one of said aircraft (2, 2') of said fleet. • a step of recording (12, 22) said measurements of said at least one physical operating parameter in a storage unit (3, 3'); • a first step of transmitting (13, 23) said measurements of said at least one physical operating parameter contained in said storage unit (3, 3') to a communication station (4, 4') external to said aircraft (2, 2'), said communication station (4, 4') being installed at the premises of an operator of said aircraft (2, 2'); • a second step of transmitting (14, 24) said measurements of said at least one physical operating parameter from said communication station (4, 4') to an analysis centre external to said aircraft (2, 2'), said analysis centre being common to a fleet of aircraft (2, 2') of the same type and being installed at the premises of a manufacturer of said fleet of aircraft (2, 2'); • a step of generating (15, 25) said at least one indicator based on said measurements of said at least one physical operating parameter; • a step of analysing (16, 26) the variations of said at least one indicator;