{"id":"F2006B04970","name":"AD/CESSNA 170/42 - Oil Pressure Line","slug":"ad-cessna-170-42-oil-pressure-line","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44854,"registerId":"commonwealth-F2006B04970-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 170/42 - Oil Pressure Line","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 170, 172, F172, FR172 and 175 Series Aeroplanes\n\n \n\nAD/CESSNA 170/42 Oil Pressure Line 5/81\n\nApplicability: Model 172 with S/Nos. 17274010 to 17274579 and 17274587. Model F172 with S/Nos. F17202040 to F17202149.\n\n \n\nRequirement: Action in accordance with Cessna S.I.L. SE81-5. Compliance:  Within 100 hours time in service after 31 May 1981.\n\nBackground: This Directive is promulgated to prevent oil loss due to the possibility of fracturing the oil pressure line.\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","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1546},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive maintains a narrow, targeted scope limited to addressing a specific mechanical defect (oil pressure line fractures) in defined aircraft models. There is no evidence of scope expansion beyond the original safety purpose."},"complexity_factors":["Extremely short length (under 150 words)","Single, clear requirement with no exceptions or conditions","No defined terms requiring interpretation","Straightforward compliance deadline","Limited applicability restricted to specific serial number ranges"],"plain_english_summary":"**What this is:** An airworthiness directive (a mandatory safety order) requiring owners of specific Cessna aircraft to fix a potentially dangerous defect in the engine oil system.\n\n**Who it affects:** Owners of specific Cessna 172 and F172 aeroplanes with the following serial numbers:\n- Model 172: S/N 17274010 to 17274579 and 17274587\n- Model F172: S/N F17202040 to F17202149\n\n**What must be done:** Aircraft owners must carry out the inspection and repair actions described in the manufacturer's document \"Cessna Service Information Letter SE81-5\" to address the oil pressure line.\n\n**When:** Within 100 hours of \"time in service\" (flying time) after 31 May 1981.\n\n**Why it matters:** The oil pressure line on these aircraft could fracture (crack), causing engine oil to leak out. This could lead to engine failure and loss of control of the aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-170-42-oil-pressure-line","history":"/api/acts/ad-cessna-170-42-oil-pressure-line/history","analysis":"/api/acts/ad-cessna-170-42-oil-pressure-line/analysis","conflicts":"/api/acts/ad-cessna-170-42-oil-pressure-line/conflicts","importantCases":"/api/acts/ad-cessna-170-42-oil-pressure-line/important-cases","documents":"/api/acts/ad-cessna-170-42-oil-pressure-line/documents"}}