Document ID: chunk:federal_register_of_legislation:F2006B09216:body:0
Version: federal_register_of_legislation:F2006B09216
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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
 SCHEDULE OF AIRWORTHINESS DIRECTIVES

 Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes

AD/DHC-8/6 MLG Uplock Actuator 8/89

            Applicability: Model DHC 8 serial number 3 and subsequent with MLG uplock actuator part numbers 10800-103, -105, -107, -109 and -111 installed, and which do not have modification 8/1098 incorporated.

             Requirement: 1. Unless previously accomplished, inspect/rectify the MLG uplock installation in accordance with De Havilland SB No. 8-32-79 Revision A.

             2. Rework and re-identify all uplock actuators in accordance with De Havilland SB No. 8-32-79 Revision A.

            Note 1: Compliance with Requirement 2 constitutes terminating action for Requirement 1.

            Note 2: Canadian AD CF-89-03 refers.

             Compliance: 1. Within 50 hours time in service after 10 August 1989; repeat, prior to further flight, whenever the proximity sensor and/or proximity sensor mounting bracket on an uplock actuator has been reset or replaced.

            2. Prior to 28 February 1990.

            Background: A trapped MLG uplock actuator target lever may occur under adverse tolerance conditions combined with a failed target lever return spring. This occurrence will prevent the rotation of the main gear uplock latch and the release of the main landing gear.