{"id":"F2006B08174","name":"AD/CESSNA 310/46 - Engine Mount - Inspection and Replacement","slug":"ad-cessna-310-46-engine-mount-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115368,"registerId":"commonwealth-F2006B08174-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 310/46 - Engine Mount - Inspection and Replacement","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)  Cessna 310 Series Aeroplanes\n\n \n\nAD/CESSNA 310/46 Engine Mount - Inspection and Replacement\n\nApplicability: All model 310R with S/Nos. 310R0501 to 310R0692. Document:  Cessna SL ME77-4.\n\nCompliance: Within the next 25 hours time in service after 30 March 1977.\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\n \n\n \n\n \n\n \n\n\n5/77\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1040},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive remains tightly scoped to its original purpose: addressing a specific airworthiness concern (engine mount integrity) on a narrow subset of aircraft (Cessna 310R, S/N 310R0501-310R0692). It has not expanded to include other aircraft models, components, or maintenance requirements beyond the original engine mount inspection mandate."},"complexity_factors":["Document is only 4 substantive lines long","Single, unambiguous compliance trigger (25 hours time in service)","Precise applicability limited to specific serial number range","No defined terms, cross-references, or conditional exceptions","Straightforward imperative language ('Inspection and Replacement')"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA). Think of it as a compulsory recall notice for aircraft.\n\n**What it requires:** Owners or operators of specific Cessna 310R aeroplanes must inspect the engine mounts and replace them if necessary. This must be done within the next 25 hours of flight time after 30 March 1977.\n\n**Who it affects:** Only applies to Cessna 310R models with serial numbers between 310R0501 and 310R0692 (approximately 192 aircraft).\n\n**Why it matters:** Engine mounts hold the engine to the airframe. If they fail, the engine could detach during flight. This directive addresses a specific safety defect identified by the manufacturer in Service Letter ME77-4.\n\n**The fine print:** Compliance is based on \"time in service\" (actual flying hours), not calendar time."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-310-46-engine-mount-inspection-and-replacement","history":"/api/acts/ad-cessna-310-46-engine-mount-inspection-and-replacement/history","analysis":"/api/acts/ad-cessna-310-46-engine-mount-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-cessna-310-46-engine-mount-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-cessna-310-46-engine-mount-inspection-and-replacement/important-cases","documents":"/api/acts/ad-cessna-310-46-engine-mount-inspection-and-replacement/documents"}}