Document ID: chunk:federal_register_of_legislation:F2006B02552:body:0
Version: federal_register_of_legislation:F2006B02552
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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
    SCHEDULE OF AIRWORTHINESS DIRECTIVES

    Airtractor AT-300, 400 and 500 Series Aeroplanes

    AD/AT/3
    Amdt 5

    Landing Gear 4/97

               Applicability: All models fitted with main landing gear spring legs P/N 40007-2/-3, 40058-1/-2 and 40086-1.

               Requirement: Retire the main landing gear spring legs, the forward and aft main gear clamp block bolts and the inboard main gear large bolt.

               Note: Snow Engineering Service Letters #117, #119 and FAA AD 82-06-12 refer.

    Compliance: Retire the main landing gear spring legs at the number of landings listed in Table 1.
               At the same time, retire the forward and aft main gear clamp block bolts and the inboard main gear large bolt.

               If, during initial compliance with this directive, any or all of the components listed in the above Requirement are found to be outside the Table 1 lives, replace those components within 500 landings after 27 March 1997, or by 30 June 1997, whichever occurs first.

                              Table 1 - Spring Retirement Lives

    Spring Part #     Thickness (in)          Aircraft Fitted                Retire at every (#LDGs)
40007-2               1.0              AT-300, -301                          7500
40007-2               1.0              AT-302, -400A                         6000
40058-1               1.0              AT-300, -301                          7500
40058-1               1.0              AT-400, -400A                         6000
40058-2               1.19             AT-400, -402, -402A, -402B            10000
40058-2               1.19             AT-301, -400A, -401, -401B            12500
40007-3               1.12             AT-301, -401, -401B                   12500
40086-1               1.31             AT-501, -502, -502A, -502B, -503A     8000

               Where the total number of landings during a period of service has not been recorded, the number of landings for that period of service is to be calculated using a rate of 4 landings per hour time in service.

               This Amendment becomes effective on 27 March 1997.
 COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
 SCHEDULE OF AIRWORTHINESS DIRECTIVES

           Background:  The original directive was written to inspect for cracking of the undercarriage springs and to publish a life limitation on the springs after a number of failures. Since initial issue of the directive and subsequent amendments, service history and the introduction of a bolt retirement life have led to a need to reassess the directive.

           This amendment deletes the retirement life based on flight hours, as the cause of failure is driven by number of landings.
           Amendment 4 of this Airworthiness Directive became effective on 30 January 1997. Amendment 3 of this Airworthiness Directive became effective on 17 August 1995. The original issue of this Airworthiness Directive became effective on
           30 September 1982.