Fuel meter protected from icing

A fuel metering unit comprising:

• a movable element including at least a fuel passage section opening upstream towards a fuel supply conduit and opening downstream towards a conduit of use through a metering slot with a flared profile having a narrow passage section flaring as far as a wide passage section, the movable element being able to be displaced with respect to a fixed element between a low flow rate position in which the metering slot is for a large part obstructed and a high flow rate position in which the metering slot is for a large part exposed, the metering slot being made in the fixed element or in the movable element and obstruction of the metering slot being obtained by covering the metering slot with a wall of the movable element or of the fixed element,
• wherein the metering unit further includes a device configured to obstruct at least partly the narrow passage section of the metering slot when the metering unit is in the high flow rate position.