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-8/66 In-Flight Selection of Ground Beta 11/99 Applicability: DHC-8 Series 100, 200 and 300 aeroplanes, except those that have incorporated CAA(UK) flight idle configuration per Bombardier (de Havilland) Customer Requests CR873SOO8112, CR873CH00003 and CH873CH00005. Requirement: 1. For aeroplanes with serial numbers (S/Ns) 003 to 509, install Bombardier Modification 8/3083 (Modification of Honeywell AA-300 Radio Altimeter) in accordance with Bombardier Regional Aircraft Division Service Bulletin (SB) 8- 34-126 dated 1 May 1998. 2. For aeroplanes with S/Ns 003 to 509 (excluding S/N 130), install Bombardier Modification 8/2852 (Addition of Warning Horn to Flight Idle Gate) in accordance with Bombardier Regional Aircraft Division SB 8-76-15 dated 22 January 1999. 3. For Series 100 aeroplanes S/Ns 003 to 390 with ground spoilers, install Bombardier ModSum 8Q100795 (Installation of weight on Wheels Disarming Logic in Aircraft with Ground Spoilers) in accordance with Bombardier Regional Aircraft Division SB 8-76-18 dated 7 January 1999. 4. For Series 100 and 200 aeroplanes with S/Ns 391 to 524 (excluding S/N 511) without ground spoilers (Post Mod 8/1860) and Series 300 aeroplanes with S/Ns 100 to 523 (excluding S/N 521), install Bombardier ModSum 8Q100794 in accordance with Bombardier Regional Aircraft Division SB 8-76-17 dated 25 January 1999 or Revision A dated 14 May 1999. 5. Amend the DHC-8 Minimum Equipment List (MEL) in accordance with Temporary Revisions No 40 and 41 of the Transport Canada Master Minimum Equipment List (MMEL) to provide three flight days of operation without the system, as long as the trigger system is still functional. Note 1: Transport Canada AD CF-99-18 refers. Note 2: Amendments to the MEL must be approved by the local CASA District Office. Note 3: Temporary Revisions No 40 and 41 were subsequently incorporated into the Transport Canada MMEL as Revision No 17 (pages 34-1 and 61-1 refer). Compliance 1. Before 31 October 2001. 2. Before 31 October 2001. 3. Before 31 October 2001. 4. Before 31 October 2001. 5. Before 31 October 2001. This Airworthiness Directive becomes effective on 4 November 1999. COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Background: Transport Canada Civil Aviation has advise that there have been incidents of in-flight selection of ground Beta on DHC-8 aeroplanes, one of which led to an engine failure. In addition, the in-flight selection of ground Beta may lead to propeller overspeed. This Directive requires modification of the aeroplane to incorporate a Beta warning horn. The warning horn operates when a flight idle gate trigger is raised while either power lever is at any position on the quadrant and the aeroplane is above 20 feet.