[1] In 1981, Gold Wings Aviation conceived an aircraft research and development undertaking called the Norlindo program, named after one of its first engineers.
The program was launched as an innovative step to build an aircraft of local design and utilizing indigenous materials.
[2] The Defiant project came out to be an excellent collaborative effort of a group of aeronautical engineers, aviation enthusiasts, government agencies and research institutions.
The Ramos administration in 1997 renamed the Defiant project to Centennial and was given green light alongside the PADC Hummingbird helicopters.
[4] The two-seat tandem Defiant prototype (registered as RP-X239) was an exceptional technical arrangement of various systems and parts taken from different types of aircraft in the PAF inventory.