{"id":"F2006B02126","name":"AD/AC/67 - Goodyear Fuel Cells - Inspection","slug":"ad-ac-67-goodyear-fuel-cells-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41356,"registerId":"commonwealth-F2006B02126-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC/67 - Goodyear Fuel Cells - Inspection","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue 6/1978,Aircraft below 5700 kg,Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes,Goodyear Fuel Cells - Inspection,67\ntitle: Airworthiness Directive - AD/AC/67 - Goodyear Fuel Cells - Inspection\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)  Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes\n\n \n\nAD/AC/67 Goodyear Fuel Cells - Inspection 6/78\n\nApplicability: Models: 500, 500A, 500B, 500U, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P), 680T, 680V, 680W and 720 with S/Nos. 231 to 1969; 500S with\n\nS/Nos. 3050 and on; 681 with S/Nos. 6001 to 6072; 685 with S/Nos. 12000 to 12066; 690, 690A and 690B with S/Nos. 11001 and on; fitted with Goodyear BTC-39 fuel cells.\n\n \n\nDocument: Rockwell International SB No. 165.\n\n \n\nCompliance: Within 100 hours’ time in service after 30 June 1978 and annually thereafter as detailed in Rockwell International SB No. 165.\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, targeted safety directive focused on a specific known defect in specific aircraft. It has not expanded beyond its original purpose of mandating fuel cell inspections for the identified aircraft population."},"complexity_factors":["Very short document (under 300 words)","Only 4 defined elements: applicability (aircraft models/serial numbers), document reference, compliance deadline, and recurring requirement","No nested exceptions or conditional logic — straightforward 'if your plane matches this description, do this inspection'","Single cross-reference to external technical document (Rockwell SB No. 165)","Clear, unambiguous compliance timeline (100 hours after fixed date, then annually)"],"plain_english_summary":"This AD mandates owners/operators of specified Twin Commander (Gulfstream/Rockwell/Aerocommander 500/600/700 series) aircraft fitted with Goodyear BTC‑39 fuel cells to inspect those fuel tanks per Rockwell Service Bulletin No. 165. The initial inspection is within 100 flight hours after 30 June 1978 and then annually. It addresses fuel cell defects that can cause leaks, engine failure, or fire."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The Directive's scope is the inspection requirement as stated: it applies to the listed Twin Commander models/serial numbers fitted with Goodyear BTC‑39 fuel cells and requires actions per Rockwell SB No.165 within the specified timeframes. The instrument itself does not indicate any amendment to that scope or additional extensions beyond the stated applicability and compliance provisions (Applicability; Document; Compliance)."},"complexity_factors":["Narrow technical subject: inspection of Goodyear BTC‑39 fuel cells (Applicability).","Detailed applicability by model and serial number requires checking aircraft records (Applicability).","Mandates compliance with an external document (Rockwell International SB No.165) rather than embedding procedures in the AD (Document).","Simple, fixed compliance timing: within 100 hours after 30 June 1978 and annually thereafter (Compliance).","Limited administrative burden: scheduling, inspection costs and record-keeping for operators; no complex approval or discretionary processes specified."],"plain_english_summary":"This Airworthiness Directive requires operators of specified Twin Commander aeroplane models fitted with Goodyear BTC‑39 fuel cells to carry out the inspection procedures in Rockwell International Service Bulletin No.165. Inspections must occur within 100 hours' time in service after 30 June 1978 and then annually. It affects owners/operators of the listed serial-numbered aircraft, who must arrange and fund the inspections to maintain airworthiness compliance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-67-goodyear-fuel-cells-inspection","history":"/api/acts/ad-ac-67-goodyear-fuel-cells-inspection/history","analysis":"/api/acts/ad-ac-67-goodyear-fuel-cells-inspection/analysis","conflicts":"/api/acts/ad-ac-67-goodyear-fuel-cells-inspection/conflicts","importantCases":"/api/acts/ad-ac-67-goodyear-fuel-cells-inspection/important-cases","documents":"/api/acts/ad-ac-67-goodyear-fuel-cells-inspection/documents"}}