A year later the figure dropped to 131. None have been delivered since. Since 1996, major financial and business restructuring programs have been approved with western joint venture partnerships. Proven airframe service life is 6,000 hours. The L-39 was also flown by the Russian Knights, their equivalent of the Blue Angels.
Armament is similar, but includes an option of four external fuel drop tanks.
For export, this model was given the designation L-59. However, it failed to be nominated, so the project was terminated. Building on the experience gained with the L-139. Self protection systems include a radar warning receiver and countermeasures dispenser. Debriefing and data transfer aids with dual video tape recorder and data transfer system.