the main spar. The aircraft's engineers told the NTSB that the changes made to the design resulted in a wing that was soft and flexible, allowing its shape to become distorted and possibly causing unpredictable behavior in stalls and spins. The design engineers said that the GAW-1 airfoil required a rigid structure because it was especially sensitive to airfoil shape, and that use of a flexible surface with that airfoil would make the Tomahawk wing "a new and unknown commodity in stalls and spins." Airworthiness Directive 83-14-08 issued in September 1983 mandated an additional pair of stall strips to be added to the inboard leading edge of the PA-38 wing to "standardize and improve the stall characteristics". Specifications (PA-38-112 Tomahawk II) See also References Sources Taylor, John W.R. Jane's All The World's Aircraft 1982–83. London:Jane's Yearbooks, 1982. . External links Low-wing aircraft Single-engined tractor aircraft 1970s United States civil trainer aircraft Tomahawk T-tail aircraft Aircraft first flown in 1978