Adjustable and lockable turnbuckle

A method to adjust and lock a turnbuckle in a variable stator vane assembly, the method comprising:

• adjusting a first extension rod relative to a first end of an elongated body;
• tightening a first jam nut comprising a single component having internal threading and a skirt positioned about the first extension rod against the first end of the elongated body so that the skirt of the first jam nut is positioned about the first end of the elongated body;
• drilling a first aperture completely through the elongated body, the first extension rod, and the skirt of the first jam nut from a first side of the skirt of the jam nut to an opposite diametrically opposed second side of the skirt of the jam nut and through the elongated body and the first extension rod disposed within the skirt of the jam nut, wherein the first aperture is transverse to a longitudinal axis of the elongated body and the first extension rod;
• and
• positioning a first pin completely through and within the first aperture to abut and prevent movement of the elongated body, the first extension rod, and the skirt of the first jam nut relative to one another.

A variable stator vane linkage assembly, comprising:

• at least one adjustable and lockable turnbuckle, comprising:
• an elongated body comprising internal threading within a first end thereof;
• a first extension rod comprising external threading configured to mate with the internal threading at the first end of the elongated body;
• a first jam nut comprising a single component having internal threading and a skirt, wherein the internal threading of the first jam nut is configured to mate with the external threading of the first extension rod to tighten the first jam nut against the first end of the elongated body so that the skirt of the first jam nut is positionable about the first end of the elongated body;
• a first aperture extending completely through the elongated body, the first extension rod, and the skirt of the first jam nut from a first side of the skirt of the jam nut to an opposite diametrically opposed second side of the skirt of the jam nut and through the elongated body and the first extension rod disposed within the skirt of the jam nut, wherein the first aperture is transverse to a longitudinal axis of the elongated body and the first extension rod;
• and
• a first pin positionable completely through and within the first aperture to abut and prevent movement of the elongated body, the first extension rod, and the skirt of the first jam nut relative to one another.