{"id":"F2006B02124","name":"AD/AC/65 - Wing Spar Fillet Screws - Inspection and Replacement","slug":"ad-ac-65-wing-spar-fillet-screws-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41354,"registerId":"commonwealth-F2006B02124-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC/65 - Wing Spar Fillet Screws - Inspection and Replacement","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 1/1978,Aircraft below 5700 kg,Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes,Wing Spar Fillet Screws - Inspection and Replacement,65\ntitle: Airworthiness Directive - AD/AC/65 - Wing Spar Fillet Screws - Inspection and Replacement\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/65 Wing Spar Fillet Screws - Inspection and Replacement\n\n\n1/78\n\n \n\nApplicability: All model 685 with S/Nos. 12000 to 12066. All models 690, 690A and 690B except those S/Nos. as quoted in SB No. 164.\n\n \n\nDocument: Rockwell International SB No. 164.\n\n \n\nCompliance: Unless already accomplished inspect within 100 hours’ time in service after 1 March 1978 and thereafter at intervals not exceeding 100 hours’ time in service until replaced as per requirement document.\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":1807},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope addressing a specific airworthiness issue concerning wing spar fillet screws in identified Twin Commander aircraft. No expansion beyond the original technical safety requirement is evident."},"complexity_factors":["Extremely short document (approximately 100 words of substantive content)","Narrow applicability limited to specific aircraft models and serial number ranges","Single compliance pathway with fixed time intervals and clear endpoint","Only one external reference (Rockwell SB No. 164)","No defined terms, exceptions, or conditional logic"],"plain_english_summary":"**What this does:** This is a mandatory safety order requiring owners of specific Twin Commander aircraft to repeatedly inspect—and eventually replace—critical screws in the wing structure.\n\n**Who it affects:** Owners and operators of:\n- Twin Commander model 685 (serial numbers 12000 to 12066)\n- Models 690, 690A, and 690B (except specific serial numbers listed in Rockwell Service Bulletin 164)\n\n**What you must do:**\n- **Inspect** the **wing spar fillet screws** (the fasteners where the wing meets the fuselage) within 100 flight hours after 1 March 1978\n- **Repeat** the inspection every 100 flight hours thereafter\n- **Replace** the screws according to Rockwell International Service Bulletin No. 164, at which point the inspections can stop\n\n**Why it matters:** This prevents structural failure of the wing attachment points caused by worn or fatigued screws, which could lead to loss of the aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-65-wing-spar-fillet-screws-inspection-and-replacement","history":"/api/acts/ad-ac-65-wing-spar-fillet-screws-inspection-and-replacement/history","analysis":"/api/acts/ad-ac-65-wing-spar-fillet-screws-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-ac-65-wing-spar-fillet-screws-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-ac-65-wing-spar-fillet-screws-inspection-and-replacement/important-cases","documents":"/api/acts/ad-ac-65-wing-spar-fillet-screws-inspection-and-replacement/documents"}}