An aircraft landing gear assembly comprising: a first structural member; a second structural member pivotally coupled to the first structural member at an apex pivot point (P1') so as to be movable between a first angular condition and a second angular condition distinct from the first angular condition; wherein the first structural member is a first arm of one of a stay or lock link and the second structural member is a second arm of a second one of the stay or lock link; a down-lock spring having a first end region pivotally coupled to a mounting structure and being arranged under tension to bias the first and second structural members to assume the first angular condition; and a linkage assembly, the linkage assembly comprising: an arm member pivotally coupled to one of the first and second structural members at an arm pivot point (P2'), the arm having a first end region pivotally coupled to a second end region of the down-lock spring; and characterized in that it further comprises a control link pivotally coupled to one of the first and second structural members at a first control link pivot point (P4') and pivotally coupled to the arm member at a second control link pivot point (P5') such that, as the first and second structural members move relative to one another from the first angular condition towards the second angular condition, the first control link pivot point moves over centre, through an axis or plane bisecting the apex pivot point and the second control link pivot point. a first structural member; a second structural member pivotally coupled to the first structural member at an apex pivot point (P1') so as to be movable between a first angular condition and a second angular condition distinct from the first angular condition; wherein the first structural member is a first arm of one of a stay or lock link and the second structural member is a second arm of a second one of the stay or lock link; a down-lock spring having a first end region pivotally coupled to a mounting structure and being arranged under tension to bias the first and second structural members to assume the first angular condition; and a linkage assembly, the linkage assembly comprising: an arm member pivotally coupled to one of the first and second structural members at an arm pivot point (P2'), the arm having a first end region pivotally coupled to a second end region of the down-lock spring; and characterized in that it further comprises a control link pivotally coupled to one of the first and second structural members at a first control link pivot point (P4') and pivotally coupled to the arm member at a second control link pivot point (P5') such that, as the first and second structural members move relative to one another from the first angular condition towards the second angular condition, the first control link pivot point moves over centre, through an axis or plane bisecting the apex pivot point and the second control link pivot point. an arm member pivotally coupled to one of the first and second structural members at an arm pivot point (P2'), the arm having a first end region pivotally coupled to a second end region of the down-lock spring; and characterized in that it further comprises a control link pivotally coupled to one of the first and second structural members at a first control link pivot point (P4') and pivotally coupled to the arm member at a second control link pivot point (P5') such that, as the first and second structural members move relative to one another from the first angular condition towards the second angular condition, the first control link pivot point moves over centre, through an axis or plane bisecting the apex pivot point and the second control link pivot point.