{"id":"F2006B06853","name":"AD/SD3-60/1 Amdt 1 - Engine Flexible Mounts - Inspection and Modification","slug":"ad-sd3-60-1-amdt-1-engine-flexible-mounts-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114727,"registerId":"commonwealth-F2006B06853-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-60/1 Amdt 1 - Engine Flexible Mounts - Inspection and Modification","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\nShort SD3-60 Series Aeroplanes\n\n \n\nAD/SD3-60/1\n\nAmdt 1\n\n\nEngine Flexible Mounts - Inspection and Modification\n\n\n12/84\n\n \n\nApplicability: All models SD-360 aircraft fitted with Barry engine mounts P/No. 93880-12, which have not been modified in accordance with Shorts Service Bulletin SD 360-71-08.\n\nDocument: Shorts Service Bulletin SD 360-71-A02, Rev 1.\n\n \n\nCompliance: Inspect - prior to issue of the next Maintenance Release after 31 December 1984, and thereafter at each issue of a new Maintenance Release.\n\nBackground: The manufacturer has reported instances of metal to rubber bond separation of moulded assembly.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive focused on a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single, clearly defined applicability clause targeting specific aircraft model and part number","Straightforward two-part compliance requirement (initial inspection + recurring inspections)","Only one external document reference (manufacturer's service bulletin)","No defined terms section, no cross-references to other legislation, no conditional exceptions","Background explanation provided in plain language","Extremely short document (approximately 150 words of substantive content)"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific maintenance actions on certain aircraft.\n\n**What it does:**\nOrders owners and operators of **Short SD3-60 series aircraft** (a type of regional turboprop plane) to inspect and modify the **engine flexible mounts** — the rubber-and-metal components that attach the engines to the wing and absorb vibration.\n\n**Who it affects:**\n- All SD-360 aircraft fitted with **Barry engine mounts part number 93880-12**\n- **Only if** those mounts haven't already been modified according to an earlier manufacturer bulletin (Shorts Service Bulletin SD 360-71-08)\n\n**What must be done:**\n- **Inspect** the engine mounts before the next Maintenance Release (a formal certificate allowing the aircraft to fly) issued after 31 December 1984\n- **Continue inspecting** at every subsequent Maintenance Release\n- Follow the technical instructions in **Shorts Service Bulletin SD 360-71-A02, Revision 1**\n\n**Why it matters:**\nThe manufacturer found cases where the **metal-to-rubber bond was separating** in these mounts. If this bond fails completely, the engine could detach from the wing or cause catastrophic structural damage during flight. This directive prevents that failure through regular inspection and mandatory modification.\n\n**In short:** If you own one of these specific aircraft with these specific engine mounts, you must check them regularly and fix them according to the manufacturer's instructions — or the aircraft cannot legally fly."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The instrument is labelled 'Amdt 1' indicating it amends a prior Airworthiness Directive (AD/SD3-60/1). The supplied text is the amended directive but does not include the original pre-amendment text, so the specific textual changes to scope or requirements cannot be identified from the supplied document alone. The AD as supplied applies to SD-360 aircraft fitted with Barry engine mounts P/No. 93880-12 not already modified per Shorts Service Bulletin SD 360-71-08 and prescribes inspection and modification actions via Shorts Service Bulletin SD 360-71-A02, Rev 1 (Applicability; Document; Compliance)."},"complexity_factors":["Limited technical scope: applies only to SD-360 aircraft fitted with Barry engine mounts P/No. 93880-12 (Applicability)","Dependency on an external technical document for procedural detail (Shorts Service Bulletin SD 360-71-A02, Rev 1) rather than including procedures in the AD (Document)","Recurring inspection obligation tied to each Maintenance Release, creating ongoing compliance duties (Compliance)","Date-based compliance trigger combined with maintenance-schedule linkage (inspect prior to next Maintenance Release after 31 December 1984) (Compliance)","No detailed description of the modification or inspection criteria in the AD, requiring operators to obtain and interpret the service bulletin (Document)"],"plain_english_summary":"# What this instrument does\n\n- This Airworthiness Directive (AD) requires owners/operators of Short SD-360 aeroplanes that have Barry engine mounts part number 93880-12 (and have not already been modified per Shorts Service Bulletin SD 360-71-08) to inspect those engine flexible mounts and to carry out any modification work set out in the referenced service document. (Applicability; Document)\n- The inspection must be carried out before the next Maintenance Release issued after 31 December 1984 and must then be repeated at every subsequent issue of a new Maintenance Release. (Compliance)\n\n# Why it was issued (official claim)\n\n- The manufacturer reported instances of metal-to-rubber bond separation in the moulded mount assembly; the AD cites that as the reason for mandating inspection and modification. (Background)\n\n# Who it affects and who pays\n\n- Affected parties: Owners/operators of all models SD-360 aircraft that are fitted with Barry engine mounts P/No. 93880-12 and that have not already been modified per the specified service bulletin. (Applicability)\n- Who pays: The aircraft owner/operator is responsible for arranging and funding the required inspections and any modifications indicated by the inspection or required by the referenced service bulletin. (Compliance; Document)\n\n# What decisions are imposed and when\n\n- The regulator (Civil Aviation Safety Authority, via the AD) requires the inspection to be completed before issuing the next Maintenance Release after the specified date and repeated at each subsequent Maintenance Release. That ties compliance to the existing maintenance-release process used by operators. (Compliance)\n- The AD refers operators to Shorts Service Bulletin SD 360-71-A02, Rev 1 as the technical document for inspection/modification actions. The AD does not include the technical content of that bulletin; operators must obtain and follow that document to perform the work. (Document)\n\n# Practical effects, incentives and trade-offs\n\n- Direct costs and time: Operators will incur inspection labour and any repair/modification costs set out in the service bulletin. These are recurring inspection obligations because the AD links inspection frequency to each new Maintenance Release. (Compliance; Document)\n- Incentives: Operators have an incentive to either perform the modification specified by the service bulletin (if it removes the repetitive inspection burden) or to continue with the periodic inspection schedule. The AD identifies a specific part number and condition (unmodified mounts) so owners can determine whether the obligation applies to their aircraft. (Applicability; Document)\n- Opportunity cost: Time spent on inspections/modifications displaces other maintenance or operational activities during the maintenance-release process. (Compliance)\n- Implementation risk and compliance burden: The AD delegates the technical method (inspection and modification) to the referenced service bulletin. Operators must source and follow that bulletin; the AD itself does not describe the detailed procedure, which creates dependency on the bulletin’s availability and clarity. (Document)\n\n# Effects on private choice and market participants\n\n- The requirement applies narrowly to a subset of SD-360 aircraft fitted with a specified part number; it does not apply to aircraft already modified per the earlier Shorts Service Bulletin SD 360-71-08. That creates a clear compliance trigger tied to documented modification status. (Applicability)\n- For maintenance providers and component suppliers, demand for the service-bulletin-specified work and for replacement mounts (if required) may increase among affected operators. The AD does not itself set prices or suppliers; operators remain free to procure parts and services subject to regulatory and airworthiness approval processes. (Document)\n\n# Summary of implementation mechanics\n\n- Who decides compliance timing: The AD prescribes timing tied to the operator’s Maintenance Release schedule and a fixed calendar cutoff (next Maintenance Release after 31 December 1984). (Compliance)\n- What technical instructions to follow: Shorts Service Bulletin SD 360-71-A02, Rev 1. The AD does not reproduce the technical steps; it mandates adherence to that document. (Document)\n- Safety rationale cited: manufacturer-reported bond separation of metal-to-rubber in the moulded assembly. (Background)\n\n# Source references within the instrument\n\n- Applicability: identifies which aircraft and parts are covered. (Applicability)\n- Document: identifies the service bulletin to be used for inspection and modification. (Document)\n- Compliance: sets timing and recurrence of inspection relative to Maintenance Releases and the calendar date. (Compliance)\n- Background: provides the manufacturer’s reported problem that motivated the AD. (Background)\n\n"}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-60-1-amdt-1-engine-flexible-mounts-inspection-and-modification","history":"/api/acts/ad-sd3-60-1-amdt-1-engine-flexible-mounts-inspection-and-modification/history","analysis":"/api/acts/ad-sd3-60-1-amdt-1-engine-flexible-mounts-inspection-and-modification/analysis","conflicts":"/api/acts/ad-sd3-60-1-amdt-1-engine-flexible-mounts-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-sd3-60-1-amdt-1-engine-flexible-mounts-inspection-and-modification/important-cases","documents":"/api/acts/ad-sd3-60-1-amdt-1-engine-flexible-mounts-inspection-and-modification/documents"}}