{"id":"F2006B06877","name":"AD/SD3-60/32 - Main Wheel Tyres","slug":"ad-sd3-60-32-main-wheel-tyres","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114757,"registerId":"commonwealth-F2006B06877-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-60/32 - Main Wheel Tyres","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/SD3-60/32 Main Wheel Tyres 4/91\n\nApplicability: Model SD3-60 Series 300; plus aircraft Serial Numbers SH3708, SH3712, SH3713, SH3714, SH3715.\n\n \n\nRequirement: Action in accordance with Mandatory Dunlop Limited SB 32-1044.\n\n \n\nNote: Shorts SD3-60 IL-171 refers.\n\n \n\nCompliance: As specified in the Requirement Document but with a revised effectivity date of 18 April 1991 for Australian registered aircraft.\n\n \n\nBackground: Premature failure of main landing gear tyres part number DR19922T has occurred.\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\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The AD updates the timing for compliance by specifying a revised effectivity date of 18 April 1991 for Australian-registered aircraft (Compliance). Apart from that temporal change, the AD applies to the Model SD3-60 Series 300 and the listed serial numbers as stated (Applicability)."},"complexity_factors":["Short, narrowly scoped directive applying to a single model and a small set of serial numbers (Applicability)","Mandates compliance by reference to an external mandatory manufacturer service bulletin rather than reproducing technical steps (Requirement)","Revised effectivity date for Australian-registered aircraft introduces a temporal modification to when compliance is required (Compliance)","Cross-reference to another document (Shorts SD3-60 IL-171) increases the number of external documents operators must consult (Note)","Technical details (inspection/replacement procedures) are contained in the external documents, so the AD’s operational impact depends on those documents’ contents (Requirement)"],"plain_english_summary":"This AD requires operators of specific Shorts SD3‑60 Series 300 aircraft (serials SH3708, SH3712–15) to carry out Dunlop Limited SB 32‑1044 (Australian effectivity 18 April 1991) to remedy premature failures of main landing gear tyres (part DR19922T). Costs and compliance fall to the aircraft owners/operators, CASA enforces the directive, and the technical procedures, parts and sourcing are prescribed by Dunlop’s mandatory service bulletin."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating tyre inspection/replacement for the affected Short SD3-60 aircraft."},"complexity_factors":["Very short document (approximately 150 words)","Only 1 defined applicability criterion (specific aircraft model and 5 serial numbers)","Single requirement referencing an external document (Dunlop SB 32-1044)","No nested conditional logic or exceptions","No cross-references to other legislation beyond a single note referencing IL-171","Straightforward compliance date with simple modification (revised effectivity date)"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** It requires owners and operators of certain Short SD3-60 Series 300 aeroplanes (plus five specific aircraft by serial number) to follow a mandatory service bulletin from Dunlop Limited (SB 32-1044). This bulletin addresses a safety issue with main wheel tyres.\n\n**Why it matters:** The main landing gear tyres (part number DR19922T) have been failing prematurely — meaning they wear out or break earlier than expected. This creates a safety risk during takeoff and landing. The directive forces operators to take corrective action by a specific deadline (18 April 1991 for Australian-registered aircraft) to prevent accidents.\n\n**Who it affects:**\n- Owners and operators of Short SD3-60 Series 300 aircraft\n- Specifically includes aircraft with serial numbers SH3708, SH3712, SH3713, SH3714, and SH3715\n- Maintenance organisations servicing these aircraft\n\n**Key details:**\n- **Compliance deadline:** 18 April 1991 (for Australian-registered planes)\n- **Required action:** Follow Dunlop Service Bulletin 32-1044\n- **Related document:** Shorts SD3-60 IL-171 also applies"}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-60-32-main-wheel-tyres","history":"/api/acts/ad-sd3-60-32-main-wheel-tyres/history","analysis":"/api/acts/ad-sd3-60-32-main-wheel-tyres/analysis","conflicts":"/api/acts/ad-sd3-60-32-main-wheel-tyres/conflicts","importantCases":"/api/acts/ad-sd3-60-32-main-wheel-tyres/important-cases","documents":"/api/acts/ad-sd3-60-32-main-wheel-tyres/documents"}}