{"id":"F2006B02193","name":"AD/AC-112/9 - Wing Structure - Rib - Inspection","slug":"ad-ac-112-9-wing-structure-rib-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41423,"registerId":"commonwealth-F2006B02193-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC-112/9 - Wing Structure - Rib - 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 8/1978,Aircraft below 5700 kg,Gulfstream (Rockwell) 112 Series Aeroplanes,Wing Structure - Rib - Inspection,9\ntitle: Airworthiness Directive - AD/AC-112/9 - Wing Structure - Rib - 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)  Gulfstream (Rockwell) 112 Series Aeroplanes\n\n \n\nAD/AC-112/9 Wing Structure - Rib - Inspection 8/78\n\nApplicability: All model 112 with S/Nos. 3 to 470. Document:  Rockwell International SB No. SB-112-59.\n\nCompliance: Initially inspect within 100 hours’ time in service after 30 September 1978 and thereafter at intervals not exceeding 100 hours’ time in service until modified in accordance with Part II of SB-112-59.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1589},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow focus on wing rib inspections for the specified aircraft model. No expansion of scope detected."},"complexity_factors":["Limited to single aircraft type with specific serial number range (S/Nos. 3 to 470)","Simple repetitive compliance requirement (every 100 hours time in service)","Single external technical reference (Service Bulletin SB-112-59)","No conditional logic, exceptions, or nested definitions"],"plain_english_summary":"This **Airworthiness Directive** is a legally-binding safety instruction issued by the Civil Aviation Safety Authority (CASA).\n\n**What it does:**\nMandates repetitive inspections of the wing structure ribs (the internal supports inside the wings) on specific Gulfstream (Rockwell) 112 series aircraft.\n\n**Who it affects:**\nOwners and operators of Gulfstream/Rockwell Model 112 aircraft with serial numbers 3 through 470 (typically small private or training aircraft under 5,700 kg).\n\n**What must be done:**\n* **Initial inspection:** Within 100 hours of flying time after 30 September 1978\n* **Ongoing inspections:** Every 100 hours of flying time thereafter\n* **When it stops:** Once the aircraft is modified according to Part II of manufacturer's Service Bulletin SB-112-59\n\n**Why it matters:**\nFatigue cracks had been discovered in wing ribs of these aircraft. Without inspection, structural failure could occur, potentially causing loss of the aircraft and life. This rule ensures potential cracks are found before they become dangerous."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-112-9-wing-structure-rib-inspection","history":"/api/acts/ad-ac-112-9-wing-structure-rib-inspection/history","analysis":"/api/acts/ad-ac-112-9-wing-structure-rib-inspection/analysis","conflicts":"/api/acts/ad-ac-112-9-wing-structure-rib-inspection/conflicts","importantCases":"/api/acts/ad-ac-112-9-wing-structure-rib-inspection/important-cases","documents":"/api/acts/ad-ac-112-9-wing-structure-rib-inspection/documents"}}