The fault modes and system reliability of the flap control system of a certain type of military trainer are studied in the paper.

This is Rich Perkins tossing around his L-39 Albatross, which was the Soviet Union's main military jet trainer during the latter part of the Cold War.

Method Questionnaires were carried out among 1 924 military pilots, including pilots of primary trainer, attacker, fighter, bomber, transporter and helicopter.