Method for controlling a lifting jack for an aircraft engine nacelle, a jack-type lifting system implementing the method and the thus equipped nacelle

A maintenance access method for controlling at least a lifting jack of a jack-type lifting system for a cowl of a turbojet engine nacelle, the cowl being constituted by half-cylindrical shaped panels hinged, at their upper edge, on hinges and blocked, at their opposite edge, in a closed position by a lock, the jack-type lifting system comprising the lifting jack, the lifting jack including an internal rod which slides inside an external rod, each rod being fitted with a piston at one end, the internal rod being secured to one of the half-cylindrical shaped panels and the external rod being secured to a turbojet engine, said method comprising:

• a first step of reducing a maximum force value of the lifting jack to a reduced maximum force value at a beginning of an extension stroke of at least one of the internal or external rods, wherein the extension stroke extends beyond a determined portion;
• and
• a second step of switching from the reduced maximum force value resulting from said first step to a nominal maximum force value of the lifting jack when the extension stroke extends beyond the determined portion, the extension stroke extended beyond the determined portion corresponding to a start-up threshold stroke beyond which the cowl escapes from the lock when the lock is properly unlocked.