{"id":"F2006B06880","name":"AD/SD3-60/35 - Main Landing Gear Actuator","slug":"ad-sd3-60-35-main-landing-gear-actuator","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114760,"registerId":"commonwealth-F2006B06880-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-60/35 - Main Landing Gear Actuator","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Short SD3-60 Series Aeroplanes\n\n \n\nAD/SD3-60/35 Main Landing Gear Actuator 12/92\n\nApplicability: Model SD3-60 with actuator part number and serial numbers listed in Dowty Service Bulletin 32-69SD Revision 1.\n\n \n\nRequirement: Action in accordance with Dowty Mandatory Service Bulletin 32-69SD Revision 1.\n\n \n\nNote: Shorts SB SD360-32-32 refers.\n\n \n\nCompliance: Prior to 12 February 1992.\n\n \n\nBackground: An actuator recently returned to the manufacturer for investigation was found to have a malformed radius on the slots on the piston rod. Damage to the rear edge radius could result in the locking segments tipping within the slots and the subsequent failure of the actuator to unlock. As a precaution, the remaining units in the affected batch are being recalled.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive addressing a specific manufacturing defect in a specific aircraft component. It has not expanded beyond its original purpose of grounding/remediating a defective batch of landing gear actuators."},"complexity_factors":["Single, specific mechanical component targeted (main landing gear actuator)","Only one compliance action required (follow the referenced service bulletin)","Clear applicability criteria (specific aircraft model + specific part/serial numbers)","No nested exceptions, conditional logic, or alternative compliance methods","Single deadline with no phased compliance options","No defined terms section — relies on external technical document (Dowty Service Bulletin)","Extremely short document (approximately 150 words of substantive content)"],"plain_english_summary":"This CASA Airworthiness Directive mandates that operators of Short SD3-60 turboprops inspect or replace certain Dowty main landing‑gear actuators (specific part/serial numbers per Service Bulletin 32‑69SD Rev 1). A malformed piston‑rod radius can prevent gear unlocking, risking gear collapse or wheels‑up landing. Affected operators must follow the manufacturer’s mandatory service bulletin; the original compliance date was 12 February 1992."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"No indication in the text that the directive changes scope from its original intent. The AD applies only to Model SD3-60 aeroplanes with actuators identified by part and serial numbers in Dowty Mandatory Service Bulletin 32-69SD Revision 1 and mandates action in accordance with that mandatory service bulletin, with compliance required prior to 12 February 1992."},"complexity_factors":["Narrow applicability limited to SD3-60 aeroplanes with actuator part and serial numbers listed in Dowty Mandatory Service Bulletin 32-69SD Revision 1 (requires cross-referencing an external document).","Technical nature of the defect (malformed piston‑rod slot radius) requires mechanical inspection and possible component repair or replacement.","Mandatory compliance date (prior to 12 February 1992) creates a fixed short-term timetable for operators to respond.","Enforcement by regulator (Civil Aviation Safety Authority) imposes legal compliance obligations and potential penalties for non‑compliance.","Logistical and cost burden falls on operators to locate affected units, ground aircraft as needed, and source replacement parts or perform repairs."],"plain_english_summary":"This Airworthiness Directive requires operators of Shorts SD3-60 aeroplanes to inspect and, if necessary, repair or replace specific main landing gear actuators identified by part and serial numbers in Dowty Mandatory Service Bulletin 32-69SD Revision 1. The directive responds to a malformed piston‑rod slot radius that can prevent the actuator unlocking. Operators must complete the work before 12 February 1992; the Civil Aviation Safety Authority enforces compliance and affected operators bear the inspection and rectification costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-60-35-main-landing-gear-actuator","history":"/api/acts/ad-sd3-60-35-main-landing-gear-actuator/history","analysis":"/api/acts/ad-sd3-60-35-main-landing-gear-actuator/analysis","conflicts":"/api/acts/ad-sd3-60-35-main-landing-gear-actuator/conflicts","importantCases":"/api/acts/ad-sd3-60-35-main-landing-gear-actuator/important-cases","documents":"/api/acts/ad-sd3-60-35-main-landing-gear-actuator/documents"}}