{"id":"F2006B05560","name":"AD/PA-25/22 - Fuel Tank Vent System - Modification","slug":"ad-pa-25-22-fuel-tank-vent-system-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46540,"registerId":"commonwealth-F2006B05560-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-25/22 - Fuel Tank Vent System - 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-25 (Pawnee) Series Aeroplanes\n\n \n\nAD/PA-25/22 Fuel Tank Vent System - Modification 11/67\n\nApplicability: Model PA-25-235 which incorporate the modified fuel tank installation (Kit No. 514- 1-235) provided by Ansett General Aviation.\n\n \n\nRequirement: 1. Install a new vent fitting P/N 514-1-8 in accordance with Ansett General Aviation SL No. 2, Revision A.\n\n \n\n2.    Re-position the fuel tank vent fitting in accordance with Ansett General Aviation SL No. 4.\n\n \n\n3.    Drill vent holes in the tank outer skin in accordance with Ansett General Aviation SL No. 5.\n\n \n\nCompliance: Before 1 September 1971.\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":1308},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope targeting a specific safety defect in a specific aircraft configuration with a specific modification kit installed."},"complexity_factors":["Short, single-purpose directive with only three specific requirements","Technical aviation terminology and specific part numbers (P/N 514-1-8)","References to external technical documents (Ansett General Aviation Service Letters 2, 4, and 5)","Narrow applicability limited to specific aircraft model with specific modification kit"],"plain_english_summary":"This airworthiness directive requires owners/operators of Piper PA-25-235 Pawnee aircraft fitted with Ansett General Aviation Kit No. 514-1-235 to make specified fuel‑tank venting modifications (per Ansett Service Letters) before 1 September 1971. The mandated changes correct venting to prevent fuel starvation or vapor lock and reduce the risk of in‑flight engine failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-25-22-fuel-tank-vent-system-modification","history":"/api/acts/ad-pa-25-22-fuel-tank-vent-system-modification/history","analysis":"/api/acts/ad-pa-25-22-fuel-tank-vent-system-modification/analysis","conflicts":"/api/acts/ad-pa-25-22-fuel-tank-vent-system-modification/conflicts","importantCases":"/api/acts/ad-pa-25-22-fuel-tank-vent-system-modification/important-cases","documents":"/api/acts/ad-pa-25-22-fuel-tank-vent-system-modification/documents"}}