{"id":"F2006B05771","name":"AD/PA-31/67 - Goodyear Fuel Cells - Inspection","slug":"ad-pa-31-67-goodyear-fuel-cells-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135630,"registerId":"commonwealth-F2006B05771-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/67 - Goodyear Fuel Cells - Inspection","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-31 Series Aeroplanes\n\n \n\nAD/PA-31/67 Goodyear Fuel Cells - Inspection 6/78\n\nApplicability: Models: PA-31 and PA-31-300 with S/Nos. 31-1 and on; PA-31-350 with S/Nos. 31- 5001 and on; PA-31P with S/Nos. 31-P and on; PA-31T with S/Nos. 31T-7400002 and on; fitted with Goodyear BTC-39 fuel cells.\n\n \n\nDocument: Piper SB No. 591.\n\n \n\nCompliance: Within 100 hours time in service after 30 June 1978 and annually thereafter as detailed in Piper SB No. 591.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive from 1978. It has not expanded beyond its original narrow purpose of inspecting specific fuel cells on specific aircraft models. Airworthiness Directives are inherently limited in scope by design."},"complexity_factors":["Very short document (single page directive)","Only 4 defined elements: applicability (aircraft models/serial numbers), document reference, compliance timeframe, and the fuel cell model","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1988","Simple conditional logic: if aircraft model X with fuel cell Y, then do Z","Clear, unambiguous compliance deadline (100 hours time in service + annual recurrence)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA). It mandates safety inspections for specific Piper aeroplanes (the PA-31 series) that use Goodyear BTC-39 fuel cells.\n\n**What it does:**\n- Requires owners/operators of affected aircraft to inspect their Goodyear fuel cells for defects\n- The inspection must happen within 100 hours of flying time after 30 June 1978, then repeated every year\n- The exact inspection procedure is found in Piper Service Bulletin No. 591 (a technical notice from the manufacturer)\n\n**Who it affects:**\n- Owners and operators of Piper PA-31, PA-31-300, PA-31-350, PA-31P, and PA-31T aircraft with specific serial numbers\n- Only applies if the aircraft has Goodyear BTC-39 fuel cells installed\n\n**Why it matters:**\nFuel cells (flexible fuel tanks) can develop leaks or structural failures that could cause fires or engine failure. This directive ensures potential defects are caught before they cause accidents."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive establishes an inspection requirement for the identified aircraft/fuel-cell combination. The instrument itself prescribes the intended scope (specific models and serial numbers fitted with Goodyear BTC-39 fuel cells) and a compliance schedule; there is no text indicating a change from an earlier or broader scope within this document. (Applicability, Compliance, Document)"},"complexity_factors":["Narrow technical scope limited to specified PA-31 variants fitted with Goodyear BTC-39 fuel cells (Applicability)","Single required action: inspection (low procedural branching) (Compliance)","Timing rule with two milestones: initial 100 hours after 30 June 1978 and annual repetition (Compliance)","Dependence on an external technical document (Piper SB No. 591) for procedural detail (Document)","Serial-numbered applicability requires checking individual aircraft records (Applicability)"],"plain_english_summary":"This airworthiness directive mandates inspection of specified Piper PA-31 series aeroplanes when fitted with Goodyear BTC-39 fuel cells, using the procedures in Piper Service Bulletin No. 591. The first inspection is required within 100 hours TIS after 30 June 1978, then annually thereafter.\n\nOwners/operators pay for and schedule the inspections and any repairs; aircraft without BTC-39 cells are not affected. The AD enforces periodic checks to address airworthiness concerns for the specified fuel cell."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-67-goodyear-fuel-cells-inspection","history":"/api/acts/ad-pa-31-67-goodyear-fuel-cells-inspection/history","analysis":"/api/acts/ad-pa-31-67-goodyear-fuel-cells-inspection/analysis","conflicts":"/api/acts/ad-pa-31-67-goodyear-fuel-cells-inspection/conflicts","importantCases":"/api/acts/ad-pa-31-67-goodyear-fuel-cells-inspection/important-cases","documents":"/api/acts/ad-pa-31-67-goodyear-fuel-cells-inspection/documents"}}