Document ID: chunk:federal_register_of_legislation:F2006B08923:body:0
Version: federal_register_of_legislation:F2006B08923
Segment Type: other
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Character Range: 0–2369

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
    SCHEDULE OF AIRWORTHINESS DIRECTIVES

    DH114 (Heron) Series Aeroplanes

    AD/DH114/13
    Amdt 6

    Applicability: All models.

    Centre Section and Wing Spar Boom - Fatigue Life Limitations

    12/89

    Requirement: Retire from service the centre section and wing lower spar booms.

    Compliance: 1. Series 1 aircraft

(a)     Before Modification 492 and 520 - at or before 4700 hours total time in service.

(b)     Centre Section lower spar booms - after Modification 492 - at or before 40,000 hours total time in service.

(c)     Wing lower spar booms - after Modification 520 - at or before 20,000 hours total time in service.

                 2.    Series 2 aircraft (All Series 2 irrespective of power plant)

(a)     Before Modification 492 and 520 - at or before 3500 hours total time in service.

(b)     After Modification 492 and 520 - at or before the total time in service as detailed in the following graph. Interpolation between the lines for different average flight times is permissible.

               Note 1: The total time in service detailed above for the wing spar boom includes any flying hours prior to the embodiment of Modification 520.

               Note 2: The Authority must be notified of any aircraft operating regularly on stages shorter than 1/2 hour duration so that an appropriate retirement life can be determined.

               Note 3: Series 2 aircraft fitted with wing external strap modification to STC SA3125WE are exempted from wing lower spar boom retirement.

               Note 4: The manufacturer has advised that the wing life cannot be extended beyond the life of the centre section spar boom, i.e. a maximum of 30000 hours for Series 2 aircraft.
 COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
 SCHEDULE OF AIRWORTHINESS DIRECTIVES

           Background:  These life limitations were established in consultation with the aircraft manufacturer, and taking into consideration Australian operating conditions and in-flight fatigue loads measurements. This Amendment follows a query received by the Authority and extends the graph to cover higher average cruise weights. The lives at lower weights remain unchanged.