{"id":"F2006B02117","name":"AD/AC/59 Amdt 1 - Flap System - Flap Control Bracket - Inspection and Modification","slug":"ad-ac-59-amdt-1-flap-system-flap-control-bracket-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41347,"registerId":"commonwealth-F2006B02117-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC/59 Amdt 1 - Flap System - Flap Control Bracket - Inspection and Modification","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 12/1979,Aircraft below 5700 kg,Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes,Flap System - Flap Control Bracket - Inspection and Modification,59 Amdt 1\ntitle: Airworthiness Directive - AD/AC/59 Amdt 1 - Flap System - Flap Control Bracket - Inspection and Modification\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/59\n\nAmdt 1\n\n\nFlap System - Flap Control Bracket - Inspection and Modification\n\n\n12/79\n\n \n\nApplicability: All 685, 690 and 690A with S/Nos. referenced in Rockwell SB No. 157A. Document:               Rockwell SB No. 157A.\n\nCompliance: Unless already accomplished, within 100 hours’ time in service after 31 Dec 1979.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The supplied text is an Amendment 1 of AD/AC/59 but contains a single clear requirement: inspect and modify the flap control bracket per Rockwell SB No.157A within 100 hours after 31 Dec 1979. The document as provided does not show any expansion or narrowing of applicability or duties beyond that requirement, so there is no evidence in the supplied text that the scope has changed from the original instrument."},"complexity_factors":["Narrow applicability: targets specific models and serial numbers referenced in Rockwell SB No. 157A (Applicability).","Single, straightforward mandate: inspection and modification per a single service bulletin rather than multiple interdependent actions (Document: Rockwell SB No. 157A).","Short, fixed compliance window increases operational pressure but is easy to measure (Compliance: within 100 hours’ time in service after 31 Dec 1979).","Low regulatory discretion—directive prescribes the required action and references the Service Bulletin for technical detail (Document).","Compliance burden borne by aircraft owners/operators and maintenance organisations (implicit from obligation to accomplish work within stated time).","Safety-critical nature implies technical work must be performed to SB standard, creating reliance on qualified maintenance facilities (Document)."],"plain_english_summary":"This Airworthiness Directive requires operators of Twin Commander 685, 690 and 690A aeroplanes identified in Rockwell Service Bulletin No. 157A to inspect and, if necessary, modify the flap control bracket in accordance with that service bulletin. Owners/operators and their maintenance organisations must complete the work within 100 hours’ time in service after 31 December 1979 unless it has already been done; the aircraft owner bears the cost and must follow the Rockwell SB technical instructions."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is Amendment 1 to an existing Airworthiness Directive, but the document provided appears to be the complete current version. The scope remains tightly focused on the original safety issue: inspection and modification of flap control brackets on specific Twin Commander aircraft. There is no evidence of scope creep — the directive addresses one specific mechanical defect on one specific aircraft family with a clear compliance pathway."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 defined applicability criteria (aircraft model and serial number)","Single cross-reference to external document (Rockwell SB No. 157A)","Simple conditional logic: 'Unless already accomplished' creates one exception","No nested definitions or subsections","Clear, single compliance deadline with straightforward calculation method"],"plain_english_summary":"This AD mandates inspection and modification of the flap control bracket on certain Twin Commander 685/690/690A aeroplanes (serials listed in Rockwell Service Bulletin No. 157A). It requires owners/operators to carry out the work per that service bulletin to correct a known flap-system defect that could cause loss of control during takeoff or landing. Compliance is required within 100 flight hours after 31 December 1979 unless already accomplished."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-59-amdt-1-flap-system-flap-control-bracket-inspection-and-modification","history":"/api/acts/ad-ac-59-amdt-1-flap-system-flap-control-bracket-inspection-and-modification/history","analysis":"/api/acts/ad-ac-59-amdt-1-flap-system-flap-control-bracket-inspection-and-modification/analysis","conflicts":"/api/acts/ad-ac-59-amdt-1-flap-system-flap-control-bracket-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-ac-59-amdt-1-flap-system-flap-control-bracket-inspection-and-modification/important-cases","documents":"/api/acts/ad-ac-59-amdt-1-flap-system-flap-control-bracket-inspection-and-modification/documents"}}