Document ID: chunk:federal_register_of_legislation:F2006B10849:body:0:p2
Version: federal_register_of_legislation:F2006B10849
Segment Type: other
Provision Reference: 
Character Range: 4659–6867

34-A0009, dated 9 March 2000.

                1. Replace with an ADIRU having P/N HG2030AD09 or HG2030AD10 that is marked as modification 3 or 6;

             Or,

b.    Replace with a serviceable ADIRU having P/N HG2030AD09 or HG2030AD10 that is not marked as modification 3 or 6, and that has been determined to have accumulated less than 7,000 hours time in service in accordance with the ASB.

           Note 1: For purposes of this Directive, a "serviceable" ADIRU is one that satisfies the replacement requirements of Requirement 2.b. or 3.b. and on which no critical inertial reference failure has occurred.

           Installation of all ADIRUs on the aeroplane that meet the criteria of the following sub paragraphs constitutes terminating action for the requirements of this Directive:

                1. ADIRUs that have P/N HG2050AC03, HG2050AC04, or HG2050AC05; and that are marked as modification 2 or 3;

b.    ADIRUs that have P/N HG2030AD09 or HG2030AD10, and that are marked as modification 3 or 6.

           Note: FAA AD 2000-07-27 Amdt 39-11683 refers.

           Compliance:  For Requirement 1 - Prior to the next flight following any critical inertial reference failure of an ADIRU.

           For Requirement 2 - Before further flight.

               For Requirement 3 - Before further flight.

               This Airworthiness Directive becomes effective on 3 May 2000.

               Background:  The Federal Aviation administration has received reports of dual critical failures of inertial reference units on ADIRUs during flight. The actions specified in this Directive are intended to prevent loss of the main sources of attitude data, consequent high pilot workload, and a significant increase in the likelihood of pilot error.

               This Directive requires inspection of a failed ADIRU to determine its modification status, and replacement of an unmodified failed ADIRU with a serviceable ADIRU. The Directive also provides for optional terminating action.

    James Coyne
    Delegate of the Civil Aviation Safety Authority 27 April 2000

    The above AD is notified in the Commonwealth of Australia Gazette on 3 May 2000.