{"id":"F2006B08233","name":"AD/CESSNA 337/12 - Landing Gear Hydraulic Lines in Engine Compartment","slug":"ad-cessna-337-12-landing-gear-hydraulic-lines-in-engine-compartment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115485,"registerId":"commonwealth-F2006B08233-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 337/12 - Landing Gear Hydraulic Lines in Engine Compartment","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 337 Series Aeroplanes\n\n \n\nAD/CESSNA 337/12 Landing Gear Hydraulic Lines\n\nin Engine Compartment\n\n\n6/72\n\n \n\nApplicability: All models.\n\n \n\nRequirement: Replace the landing gear aluminium alloy hydraulic lines on the engine side of the firewall in the engine compartment of the front engine, with approved fire resistant lines or hose assemblies in compliance with ANO 101.22, paragraph 6.25.1 or relocate the lines behind the firewall.\n\n \n\nNote: For the purposes of this Directive the nose wheel well is not considered to be part of the engine compartment.\n\n \n\nCompliance: Within 200 hours time in service after 30 June 1972.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1453},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope addressing the specific fire safety risk posed by aluminium hydraulic lines in the engine compartment. No expansion beyond the stated safety issue."},"complexity_factors":["Single substantive requirement with two alternative compliance methods","Reference to external technical standard (ANO 101.22) requiring specialist aviation knowledge","Very short length (approximately 100 words)","Minimal conditional logic or nested exceptions"],"plain_english_summary":"This Airworthiness Directive applies to **all models of Cessna 337 aircraft**.\n\n**What it requires:**\nOwners must replace the aluminium alloy hydraulic lines for the landing gear that run through the **front engine compartment** (the area on the engine side of the firewall). You have two options to comply:\n1.  Install **fire-resistant lines or hose assemblies** that meet the technical standard ANO 101.22, paragraph 6.25.1; or\n2.  **Move the lines** to the safe side of the firewall (behind it), away from the engine heat.\n\n**Important clarification:** The nose wheel well is **not** considered part of the engine compartment for this rule.\n\n**Deadline for compliance:**\nThe work must be completed within **200 hours of flight time** after 30 June 1972."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-337-12-landing-gear-hydraulic-lines-in-engine-compartment","history":"/api/acts/ad-cessna-337-12-landing-gear-hydraulic-lines-in-engine-compartment/history","analysis":"/api/acts/ad-cessna-337-12-landing-gear-hydraulic-lines-in-engine-compartment/analysis","conflicts":"/api/acts/ad-cessna-337-12-landing-gear-hydraulic-lines-in-engine-compartment/conflicts","importantCases":"/api/acts/ad-cessna-337-12-landing-gear-hydraulic-lines-in-engine-compartment/important-cases","documents":"/api/acts/ad-cessna-337-12-landing-gear-hydraulic-lines-in-engine-compartment/documents"}}