COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 500 (Citation) Series Aeroplanes AD/CESSNA 500/25 Thrust Reverser Throttle Load Limiter 7/93 Applicability: Models 500 and 501 unit numbers -0001 to 0689 equipped with thrust reversers. Requirement: Modify in accordance with Cessna SB 500-78-11. Note: FAA AD 93-05-15 refers. Compliance: Within 150 hours time in service after 24 June 1993. Background: There has been an incident where an attempt to advance the throttle control levers during thrust reverser transition resulted in activation of the spring loaded limiter device. Subsequent displacement of the load limiter resulted in severely reduced power control authority.