{"id":"F2006B09248","name":"AD/DHC-8/89 - Aileron Tab Actuator Arms","slug":"ad-dhc-8-89-aileron-tab-actuator-arms","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53166,"registerId":"commonwealth-F2006B09248-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nBombardier (Boeing Canada/de Havilland) DHC-8 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/DHC-8/89 Aileron Tab Actuator Arms 10","sectionType":"part","heading":"AD/DHC-8/89 Aileron Tab Actuator Arms 10/2002","content":"# AD/DHC-8/89 Aileron Tab Actuator Arms 10/2002\n\nApplicability: Model 102, 103, and 106 aircraft, serial numbers 3 through 119; without Modification 8/0864 incorporated.\n\nRequirement: Visually inspect the actuator arm channel of the left and right aileron tabs for cracks in accordance with the Special Inspection Procedure contained in the Accomplishment Instructions of Bombardier Service Bulletin 8-57-7, Revision F, dated 27 March 2002.\n\nBefore further flight, repair any cracked aileron tab actuator arm channel by installing a new channel reinforcing angle and balance weight arm, in accordance with Part A of the Requirement document Accomplishment Instructions.\n\nNote 1: Incorporation of Bombardier Modification 8/0864 terminates the repeat inspection requirement of this Directive.\n\nNote 2: Transport Canada AD CF-2002-29 refers.\n\nCompliance: Within 500 flight hours after 3 October 2002. Thereafter at intervals not to exceed 500 flight hours.\n\nThis Airworthiness Directive becomes effective on 3 October 2002.\n\nBackground: Transport Canada received reports of cracked aileron tab actuator arms. Failure of the aileron tab actuator arms will result in increased roll control forces that might be interpreted by the pilot as a flight control problem.\n\n![](image.002.jpeg)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 22 August 2002\n\n![](image.001.png)","sortOrder":1}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope. It addresses a specific unsafe condition (cracked aileron tab actuator arms) in a defined fleet of aircraft, with no evidence of scope creep or expansion beyond the original safety purpose."},"complexity_factors":["Single, specific mechanical issue addressed (cracked actuator arms)","Clear applicability criteria (specific models, serial numbers, modification status)","Straightforward two-part requirement: inspect and repair if cracked","Simple compliance timeline (500 flight hours, then recurring)","Only 2 defined terms implicitly referenced (Modification 8/0864, Service Bulletin 8-57-7)","No nested exceptions or conditional logic beyond the applicability exclusion","Short document (approximately 250 words of substantive text)"],"plain_english_summary":"CASA requires operators of Bombardier DHC‑8 (Dash 8) models 102, 103 and 106, serials 3–119 without factory Mod 8/0864, to visually inspect aileron tab actuator arms for cracks per the Bombardier service bulletin, ground and repair with reinforced parts if cracked, and repeat inspections every 500 flight hours.  \n\nThe order prevents flight‑control degradation that could be misinterpreted as catastrophic failure and ends for an aircraft once the permanent factory modification is installed."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's operational scope aligns with its stated safety purpose in the Background: it mandates inspections and repairs for identified DHC-8 airframes without Mod 8/0864 to address cracked aileron tab actuator arms, and provides a terminating modification option (Applicability; Requirement; Note 1; Background)."},"complexity_factors":["Targeted applicability: specific models and serial numbers, and limited to aircraft without Modification 8/0864 (Applicability).","Technical specification references: inspection must follow Bombardier Service Bulletin 8-57-7, Revision F (Requirement).","Mandatory corrective action: repair requires installation of a new channel reinforcing angle and balance weight arm before further flight (Requirement, Part A).","Recurring compliance schedule: initial and repeat inspections at 500 flight-hour intervals measured from 3 October 2002 (Compliance).","Termination path: incorporation of Bombardier Modification 8/0864 cancels the repeat-inspection requirement (Note 1).","Regulatory basis and coordination: issued under subregulation 39.1(1) of CAR 1998 and cross-references Transport Canada AD CF-2002-29 (opening paragraph; Note 2)."],"plain_english_summary":"Requires operators of Bombardier (de Havilland) DHC-8 models 102, 103 and 106 (serials 3–119) without Modification 8/0864 to visually inspect aileron tab actuator arm channels for cracks per Bombardier Service Bulletin 8‑57‑7 Rev F and to repair any cracked channel by installing a reinforcing angle and balance weight arm before further flight. CASA issued the directive after reports of cracked actuator arms; failure can increase roll control forces and may be mistaken for a flight control problem."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-89-aileron-tab-actuator-arms","history":"/api/acts/ad-dhc-8-89-aileron-tab-actuator-arms/history","analysis":"/api/acts/ad-dhc-8-89-aileron-tab-actuator-arms/analysis","conflicts":"/api/acts/ad-dhc-8-89-aileron-tab-actuator-arms/conflicts","importantCases":"/api/acts/ad-dhc-8-89-aileron-tab-actuator-arms/important-cases","documents":"/api/acts/ad-dhc-8-89-aileron-tab-actuator-arms/documents"}}