{"id":"F2006B05575","name":"AD/PA-25/39 Amdt 1 - Fuel Tank","slug":"ad-pa-25-39-amdt-1-fuel-tank","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46589,"registerId":"commonwealth-F2006B05575-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-25/39 Amdt 1 - Fuel Tank","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPiper PA-25 (Pawnee) Series Aeroplanes\n\nAD/PA-25/39\n\nAmdt 1\n\n  \nFuel Tank 9/89\n\nApplicability: Models PA-25-150, PA-25-235 and PA-25-260 equipped with Piper fuselage fibreglass fuel tank and certified in the Agricultural category.\n\nRequirement: Unless currently installed, install a rubber fuel cell liner in the fibreglass fuel tank in accordance with Piper Service Bulletin No. 878, or other equivalent modification document.\n\nNote: Ansett General Aviation modification No. 01A514 or Piper Service Spares Letter No. SP-236A are considered to be equivalent and aircraft currently in accord with these documents require no further action.\n\nAircraft modified to install Gippsland Aeronautics fuel tank P/N GA0189-1, manufactured in accordance with drawing GA0189, are also acceptable without further action.\n\nCompliance: Prior to 31 October 1988.\n\nBackground: Local accident statistics of post impact fires involving PA-25 agricultural aircraft and field accident statistics from the manufacturer, have established that the standard fibreglass fuel tank without a rubber fuel cell liner installed, is more susceptible to post impact fire in the event of an accident. This Amendment approves installation of the fibreglass tank manufactured by Gippsland Aeronautics as an alternative acceptable configuration to the Piper fuel cell.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1664},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment expanded the original directive's scope by adding the Gippsland Aeronautics fuel tank (P/N GA0189-1) as an alternative compliant configuration. The original AD only required installation of rubber fuel cell liners in existing Piper tanks, whereas Amendment 1 permits complete tank replacement with an approved third-party component as an equivalent safety solution."},"complexity_factors":["Multiple external technical document references (Piper Service Bulletin No. 878, Ansett modification No. 01A514, Piper Service Spares Letter No. SP-236A)","Specific aircraft model numbers and manufacturer part numbers (P/N GA0189-1)","Conditional applicability clause ('Unless currently installed')","Amendment structure that modifies original requirements","Technical drawing references (GA0189)"],"plain_english_summary":"This safety directive targets owners of Piper PA-25 Pawnee crop-dusters (PA-25-150, -235, -260) because original fibreglass fuel tanks have cracked in accidents, causing post‑crash fires. It requires either installing a rubber fuel‑cell liner per Piper Service Bulletin No. 878 or replacing the tank with Gippsland Aeronautics part GA0189‑1.\n\nIf your aircraft already has the Ansett or Piper SP‑236A modification, no further action is needed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-25-39-amdt-1-fuel-tank","history":"/api/acts/ad-pa-25-39-amdt-1-fuel-tank/history","analysis":"/api/acts/ad-pa-25-39-amdt-1-fuel-tank/analysis","conflicts":"/api/acts/ad-pa-25-39-amdt-1-fuel-tank/conflicts","importantCases":"/api/acts/ad-pa-25-39-amdt-1-fuel-tank/important-cases","documents":"/api/acts/ad-pa-25-39-amdt-1-fuel-tank/documents"}}