{"id":"F2006B05360","name":"AD/P68/34 - Engine Mount","slug":"ad-p68-34-engine-mount","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45910,"registerId":"commonwealth-F2006B05360-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/P68/34 - Engine Mount","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)  Partenavia P68 Series Aeroplanes\n\n \n\nAD/P68/34 Engine Mount 5/91 DM\n\nApplicability: All P68C-TC up to serial number XXX-46TC.\n\n \n\nAll P68 OBS-TC up to serial number XXX-030 BTC.\n\n \n\nRequirement: Action in accordance with the Technical Requirements of R.A.I. AD 91-83.\n\n \n\nNote: Partenavia SB 82 refers.\n\n \n\nCompliance: Within 25 hours time in service after 27 March 1991 or prior to 30 April 1991; whichever occurs first.\n\n \n\nBackground: Reports of cracks in the engine mount structure have been received. This Directive requires a detail inspection in the area of the lower attachment.\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":false,"description":"The directive’s scope is explicitly stated in the Applicability section and limited to defined serial number ranges. The text supplied does not indicate any alteration from that stated scope; it mandates inspection per R.A.I. AD 91-83 and references Partenavia SB 82 for details (Applicability; Requirement; Note)."},"complexity_factors":["Narrow, specific applicability to particular serial-number ranges (Applicability) reduces breadth but requires checking serial records.","Mandatory linkage to an external technical document (R.A.I. AD 91-83) for the required inspection procedure creates dependency and interpretation needs (Requirement).","Reference to manufacturer service bulletin (Partenavia SB 82) for additional details increases reliance on non-statutory material (Note).","Short, fixed compliance window (25 hours after 27 March 1991 or before 30 April 1991) imposes scheduling pressure on operators (Compliance).","Potential need for repair actions if cracks are found creates variable costs and uncertain downtime not specified in the AD (Background)."],"plain_english_summary":"This Airworthiness Directive mandates a detailed inspection of the engine‑mount lower attachment on specified Partenavia P68C‑TC and P68 OBS‑TC serial numbers, to detect reported cracks. It affects owners/operators of those aircraft, who must comply within a short time window and follow R.A.I. AD 91‑83 (and the referenced service bulletin). Expect inspection costs, possible repairs and short‑term grounding if cracks are found."},"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 models. It has not expanded beyond its original purpose of mandating inspections for cracked engine mounts."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 2 defined applicability categories (specific serial number ranges)","Single requirement referencing an external technical standard (R.A.I. AD 91-83)","Simple compliance deadline structure (hours OR calendar date)","No nested exceptions, conditional logic, or cross-references to other legislation","Straightforward background explanation with clear safety rationale"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) for specific Partenavia P68 aircraft.\n\n**Who it affects:** Owners and operators of:\n- **P68C-TC** model aircraft with serial numbers up to XXX-46TC\n- **P68 OBS-TC** model aircraft with serial numbers up to XXX-030 BTC\n\n**What it requires:** These aircraft must undergo a detailed inspection of the engine mount structure, specifically around the lower attachment point. The inspection must follow the technical requirements set out in Italian aviation authority directive R.A.I. AD 91-83 (referenced in Partenavia Service Bulletin 82).\n\n**Why it matters:** Cracks had been reported in the engine mount structure — the framework that holds the engine to the aircraft. A failed engine mount could cause the engine to detach in flight, with catastrophic consequences. This directive ensures potentially dangerous cracks are found before they cause failure.\n\n**When it had to be done:** Within 25 flight hours after 27 March 1991, or before 30 April 1991 — whichever came first."}},"importantCases":[],"_links":{"self":"/api/acts/ad-p68-34-engine-mount","history":"/api/acts/ad-p68-34-engine-mount/history","analysis":"/api/acts/ad-p68-34-engine-mount/analysis","conflicts":"/api/acts/ad-p68-34-engine-mount/conflicts","importantCases":"/api/acts/ad-p68-34-engine-mount/important-cases","documents":"/api/acts/ad-p68-34-engine-mount/documents"}}