The Defiant 300 is a trainer aircraft prototype developed in the late 1980s. The aircraft, constructed from wood and fiberglass, was powered by a 300-horsepower Lycoming engine. The landing gear was taken from a Beech T-34. The development cost about 40 million
Only one prototype was built, in 1986. The two-seater aircraft made its first flight in 1987, flying for about an hour. It was designed by Capt. Panfilo Villaruel, and was built by the Philippine Aircraft Development Corp., the Philippine Air Force and PASF. Later the program was canceled due to lack of support from the government.
Villaruel, who later became the Air Transportation Office head, was shot during an ill-fated takeover of a control tower of the Ninoy Aquino International Airport in November 9, 2003.