{"id":"F2006B05635","name":"AD/PA-28/81 - Fuel Filter Drain Valve - Replacement","slug":"ad-pa-28-81-fuel-filter-drain-valve-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135298,"registerId":"commonwealth-F2006B05635-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-28/81 - Fuel Filter Drain Valve - Replacement","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-28 Series Aeroplanes\n\nAD/PA-28/81 Fuel Filter Drain Valve \\- Replacement 5/81\n\nApplicability: All models except those with cabin operated fuel filter drain valves.\n\nRequirement: Replace the existing fuel filter drain valve, Piper P/N 492022, with a spring loaded drain valve that has no provision for locking in the “OPEN” position.\n\nNote: A drain valve suitable for this purpose is SAF AIR P/N CAV 110.\n\nCompliance: Within 100 hours time in service after 31 May 1981.\n\nBackground: Eight forced landings have resulted from the fuel filter drain valve being left in the LOCKED-OPEN position after pre-flight water drain checks. Although sufficient engine power may be available for the take-off run, fuel leakage from the open drain valve is such that climb power often cannot be attained.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1836},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive remains tightly focused on its original safety purpose—preventing fuel starvation in Piper PA-28 aircraft due to inadvertently open drain valves. It has not expanded beyond this specific technical remedy."},"complexity_factors":["Single, discrete mechanical modification requirement","Narrow applicability limited to one aircraft series with one explicit exemption","Simple compliance deadline (100 hours time-in-service after fixed date)","No cross-references to other legislation or conditional clauses","Minimal defined terms (only specific part numbers referenced)"],"plain_english_summary":"This safety order requires owners/operators of Piper PA-28 aircraft (Cherokee/Archer/Warrior) to replace the manual-locking fuel filter drain valve (Piper P/N 492022) with a spring‑loaded, self‑closing valve (e.g., SAF AIR P/N CAV 110). The change prevents inadvertent open drains that caused fuel loss and eight engine‑out forced landings. All PA‑28s must comply—except those already with cabin‑operated drain valves—within 100 flight hours after 31 May 1981."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-28-81-fuel-filter-drain-valve-replacement","history":"/api/acts/ad-pa-28-81-fuel-filter-drain-valve-replacement/history","analysis":"/api/acts/ad-pa-28-81-fuel-filter-drain-valve-replacement/analysis","conflicts":"/api/acts/ad-pa-28-81-fuel-filter-drain-valve-replacement/conflicts","importantCases":"/api/acts/ad-pa-28-81-fuel-filter-drain-valve-replacement/important-cases","documents":"/api/acts/ad-pa-28-81-fuel-filter-drain-valve-replacement/documents"}}