COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 170, 172, F172, FR172 and 175 Series Aeroplanes AD/CESSNA 170/33 Amdt 1 Flap Actuator 10/82 Applicability: Model 172RG with S/Nos. 172RG0001 to 172RG0005, 172RG0007 to 172RG0012, 172RG0014, 172RG0016 and 172RG0019. Requirement: Modify the flap actuator assembly P/N C301002-0108 by installing a new mechanical stop nut in accordance with Cessna Service Information Letter SE79-57, or install a replacement flap actuator assembly, P/N C301002-0110. Note: Although Cessna SIL SE79-59 does not include the model 172RG, the actuator modification for this model is the same as that provided for the model 152. FAA AD 80-01-06, Amendment 39-3649 refers. Compliance: If not already accomplished, within 100 hours time in service after 31 October 1982. Background: This amendment includes the option to replace the actuator with a new type which provides shorter travel. Overtravel may lead to an asymmetric flap condition.