COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 150, F150, 152 & F152 Series Aeroplanes AD/CESSNA 150/34 Flap Actuator Screw Mechanical Stop 3/80 Applicability: Models 152 and A152 with S/Nos. 15279406 to 15284080, A1520735 to A1520919, F15201429 to F15201798 and FA1520337 to FA15200372. Requirement: Action in accordance with Cessna SIL No. SE 79-57. Note: FAA AD 80-01-06, Amendment 39-3649 refers. Compliance: Within 100 hours time in service after 31 March 1980. Background: A mechanical stop is now available to prevent overtravel of the flap actuator assembly. Overtravel may lead to an asymmetric flap condition.