COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 400 Series Aeroplanes AD/CESSNA 400/105 Amdt 1 Main Landing Gear Wheel Bay Wing Rib and Wing Skin 10/95 Applicability: Cessna Model 401 aircraft Serial Numbers (S/N) 401-0001 to 401B0221, Model 402 S/N 402-0001 to 402B1003, Model 411 S/N 411-0001 to 411A0300, Model 414 S/N 414-0001 to 414-0802 and Model 421 S/N 421-0001 to 41B0970. Requirement: Inspect the main landing gear side brace upper support attach bolts for correct torque. Clean and do a close visual inspection of the main landing gear wheel well ribs in accordance with Cessna Service Letter (SL) ME76-2. Visually inspect the wing upper surface skin in the overwing baggage locker for cracking. Pay particular attention to the inboard side of the locker.s Compliance: Initially inspect before 100 hours time in service after 20 July 1995 or before further flight after 14 September 1995, whichever occurs later. Re-inspect at intervals not to exceed 100 hours time in service. Installation of Cessna Service Kit SK414-8E or repair to a scheme acceptable to the Authority cancels the Requirement of this Directive. This Amendment is effective 14 September 1995. Background: There have been five reports of cracking of main landing gear wheel well ribs on Australian registered aircraft. In a number of cases cracks have also been reported in the wing upper surface skin in the baggage locker. Extensive cracking of the wing ribs could result in collapse of the main landing gear. This Amendment adds repairs acceptable to the Authority as suitable terminating action.