{"id":"F2006B05998","name":"AD/PA-42/8 - Engine Inlet Fuel Filter - Modification","slug":"ad-pa-42-8-engine-inlet-fuel-filter-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114396,"registerId":"commonwealth-F2006B05998-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-42/8 - Engine Inlet Fuel Filter - 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\n![](image.001.png)  Piper PA-42 (Cheyenne III) Series Aeroplanes\n\n \n\nAD/PA-42/8 Engine Inlet Fuel Filter - Modification 9/84\n\nApplicability: All model PA-42 with S/Nos 42-7800002 to 42-7801004, 42-8001001 to 42-8001106,\n\n42-8301001 to 42-8301002, 42-5501003 to 42-5501022.\n\n \n\nRequirement: Piper SB No. 785.\n\n \n\nCompliance: Within 25 hours time in service after 31 August 1984.\n\n \n\nBackground: Excessive end play in the fuel filter by-pass flapper valve and shaft could allow restricted or blocked fuel flow should the shaft or valve disengage from the housing.\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","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1748},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is an original 1984 Airworthiness Directive maintaining its initial narrow scope: mandating a specific safety modification to a defined cohort of aircraft. It has not expanded beyond its original technical remit."},"complexity_factors":["Single-page document with minimal text and no structural divisions","No defined terms, interpretation clauses, or legislative cross-references","Applicability determined by simple serial number ranges only","Single compliance action (follow manufacturer bulletin 785) with one unambiguous deadline","No exceptions, exemptions, or conditional provisions"],"plain_english_summary":"This directive requires owners/operators of certain Piper PA-42 Cheyenne III aircraft to modify the engine inlet fuel filter per Piper Service Bulletin No. 785. It fixes a manufacturing defect in the filter’s by‑pass flapper valve shaft that can loosen and block fuel flow, risking engine failure. The modification deadline was within 25 flight hours after August 31, 1984."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-42-8-engine-inlet-fuel-filter-modification","history":"/api/acts/ad-pa-42-8-engine-inlet-fuel-filter-modification/history","analysis":"/api/acts/ad-pa-42-8-engine-inlet-fuel-filter-modification/analysis","conflicts":"/api/acts/ad-pa-42-8-engine-inlet-fuel-filter-modification/conflicts","importantCases":"/api/acts/ad-pa-42-8-engine-inlet-fuel-filter-modification/important-cases","documents":"/api/acts/ad-pa-42-8-engine-inlet-fuel-filter-modification/documents"}}