F-5F jets begin test flights from Taitung Air Base Staff writer, with CNA Several F-5F jets yesterday took off from Taitung Air Base on test flights after the air force completed a check of its fleet following a deadly crash on March 22 that led to the grounding of the fighters. The first two F-5Fs took off at approximately 8am and returned safely after 40 minutes in the air, the air force said. Wu Jung-hua (吳榮華), who heads the base, said that the flights involved only twin-seater F-5Fs, with test flights for single-seat F-5Es expected to begin soon.