{"id":"F2006B05631","name":"AD/PA-28/74 - Fuel and Vapour Return Lines - Modification","slug":"ad-pa-28-74-fuel-and-vapour-return-lines-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135285,"registerId":"commonwealth-F2006B05631-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-28/74 - Fuel and Vapour Return Lines - 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-28 Series Aeroplanes\n\n \n\nAD/PA-28/74 Fuel and Vapour Return Lines - Modification 1/79\n\nApplicability: Model PA-28R-201T with S/Nos. 28R-7703001 to 28R-7803365. Document:  Piper SB No. 625.\n\nCompliance: Within 100 hours time in service after 31 January 1979.\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 \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1570},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope targeting a specific safety modification for a defined subset of Piper PA-28 aircraft. No evidence of scope expansion beyond the original fuel system safety issue."},"complexity_factors":["Extremely short text (under 150 words)","Single, precise applicability criterion (specific aircraft model plus serial number range)","Only one external technical document reference (Piper SB No. 625)","Simple time-based compliance requirement using 'time in service' calculation","No exceptions, exemptions, or conditional clauses"],"plain_english_summary":"**What this is:** A mandatory safety directive requiring specific Piper aircraft owners to modify their fuel and vapour return lines to prevent potential fire hazards.\n\n**Who it affects:** Owners and operators of **Piper PA-28R-201T** aircraft with serial numbers between **28R-7703001 and 28R-7803365** (approximately 1977-1978 model years).\n\n**What you must do:**\n*   Inspect and modify the fuel and vapour return lines on your aircraft\n*   Carry out the work exactly as specified in **Piper Service Bulletin No. 625** (the manufacturer's official repair instructions)\n\n**When:** You must complete this modification within **100 hours of flight time** (counted from when the engine is running) after **31 January 1979**.\n\n**Why this matters:** Faulty fuel or vapour return lines can leak fuel or allow dangerous vapours to accumulate, creating serious fire or explosion risks during flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-28-74-fuel-and-vapour-return-lines-modification","history":"/api/acts/ad-pa-28-74-fuel-and-vapour-return-lines-modification/history","analysis":"/api/acts/ad-pa-28-74-fuel-and-vapour-return-lines-modification/analysis","conflicts":"/api/acts/ad-pa-28-74-fuel-and-vapour-return-lines-modification/conflicts","importantCases":"/api/acts/ad-pa-28-74-fuel-and-vapour-return-lines-modification/important-cases","documents":"/api/acts/ad-pa-28-74-fuel-and-vapour-return-lines-modification/documents"}}