An aircraft undercarriage comprising a top portion (2) secured to the aircraft and a steerable bottom portion (3) carrying wheels and suitable for being steered by a steering control system (4) fitted to the undercarriage or else by an external towing device, the undercarriage being fitted with visual warning means (9) for indicating an angular overstroke. The visual warning means comprising at least one visual indicator (14) mounted to move between a retracted position that is invisible and an extended position that is visible.
An aircraft provided with an undercarriage.