{"id":"F2006B05574","name":"AD/PA-25/38 - Fuel System","slug":"ad-pa-25-38-fuel-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46586,"registerId":"commonwealth-F2006B05574-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-25/38 - Fuel System","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-25/38 Fuel System 9/86\n\nApplicability: All models fitted with wing fuel tanks to New Zealand Airwork modifications AW 396, 397 and 401.\n\n \n\nRequirement: Modify aircraft, in a manner acceptable to the Secretary, to conform with the requirements of CAR 3.446.\n\n \n\nNote: Aircraft in agricultural category must also conform with the requirement of ANO 101.17 Para 5.12.\n\n \n\nCompliance: Within 100 hours time in service after 30 September 1986 or before 31 December 1986, whichever is the earliest.\n\n \n\nBackground: Reports have been received of the above aircraft encountering engine failure and difficulty with fuel supply due to unequal airspace tank pressures necessitating interconnection of tank airspaces or change to left/right/off single fuel selection.\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":1779},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow, remedial scope—addressing a specific fuel pressure defect in Piper PA-25 aircraft with New Zealand Airwork modifications. It has not expanded beyond this targeted safety fix."},"complexity_factors":["Extremely short length (under 200 words)","Single operative requirement but references external technical standards (CAR 3.446, ANO 101.17) without reproducing their content","Highly specific applicability limited to three specific modification types on one aircraft series","Implicit dual compliance pathways (interconnection OR selector change) mentioned only in background"],"plain_english_summary":"This AD requires urgent fuel‑system modifications to certain Piper PA‑25 Pawnee crop dusters fitted with New Zealand Airwork wing‑tank kits (AW 396, 397, 401) to prevent engine failures caused by unequal tank air pressure and resulting fuel starvation. It affects owners/operators of those aircraft, who must alter the fuel system to meet CAR 3.446 (and ANO 101.17 para. 5.12 for ag planes). Modifications were required by the earlier of 100 flight hours after 30 Sep 1986 or 31 Dec 1986."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-25-38-fuel-system","history":"/api/acts/ad-pa-25-38-fuel-system/history","analysis":"/api/acts/ad-pa-25-38-fuel-system/analysis","conflicts":"/api/acts/ad-pa-25-38-fuel-system/conflicts","importantCases":"/api/acts/ad-pa-25-38-fuel-system/important-cases","documents":"/api/acts/ad-pa-25-38-fuel-system/documents"}}