The Hurricane was furnished with a laterally-retracting undercarriage, the main undercarriage units being able to slide into recesses within the wing. Hinged telescopic Vickers-built legs are attached to the bottom boom of the wing's forward spar, but with a complex "pintle" angle setup within the wing at the top of the strut, to allow the strut to be perpendicular to the thrust line when extended, and angling rearwards as it retracted to clear the forward spar. A hydraulic jack served to actuate the undercarriage, with the carefully set "pintle" angle of the strut's upper ends assisting in the folding and pivoting the legs as to reposition the wheel unit rearwards as well as inwards in order to clear the front spar when retracted. Two separate hydraulic systems, one being power-operated and the other hand-operated, are present for the deployment and retraction of the undercarriage; in the event of both failing, pilots can release the retaining catches holding the undercarriage in place, deploying the wheels to the 'down' position using weight alone. A wide wheel-track was used to allow for considerable stability during ground movements and to enable tight turns to be performed.