{"id":"F2006B03625","name":"AD/BEECH 18/7 - Control Wheel Shaft - Modification","slug":"ad-beech-18-7-control-wheel-shaft-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43215,"registerId":"commonwealth-F2006B03625-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 18/7 - Control Wheel Shaft - 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 NK,Aircraft below 5700 kg,Beechcraft 18 Series Aeroplanes,Control Wheel Shaft - Modification,7\ntitle: Airworthiness Directive - AD/BEECH 18/7 - Control Wheel Shaft - 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)  Beechcraft 18 Series Aeroplanes\n\n \n\nAD/BEECH 18/7 Control Wheel Shaft - Modification NK\n\nApplicability: Model C-18S and AT-11. Document:  1. Beechcraft SB C-18-9; or\n\n2. FAA AD 48-51-1; or\n\n \n\n3. ANO 105.1.4.3.6.7.\n\n \n\nCompliance: Forthwith.\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\nFederal Register of Legislative Instruments F2006B03625\n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument applies to the Beechcraft Model C-18S and AT-11 and requires a control wheel shaft modification as specified in the listed documents. The text does not indicate any expansion or narrowing of that applicability from an earlier or different intent; it sets immediate compliance for the same models and prescribes the technical references to be followed (Applicability; Document list; Compliance: Forthwith)."},"complexity_factors":["Narrow applicability (only Model C-18S and AT-11) limits stakeholder range (Applicability).","Directive delegates technical detail to external documents rather than containing procedural steps (Document list).","Immediate compliance requirement (\"Forthwith\") increases operational urgency but adds no staged procedures (Compliance).","Short form text with limited statutory detail reduces regulatory complexity but requires cross-referencing external materials.","Multiple alternative documents listed means operators must choose and obtain the correct technical reference (Document list)."],"plain_english_summary":"# What this directive does\n\nThis Airworthiness Directive (AD/BEECH 18/7) requires a modification to the control wheel shaft on specific Beechcraft 18 series aeroplanes. Mechanically, the directive requires operators to carry out the modification described in one of the listed technical documents: Beechcraft Service Bulletin C-18-9, FAA AD 48-51-1, or ANO 105.1.4.3.6.7 (Document list). The directive is published as Federal Register of Legislative Instruments F2006B03625.\n\n# Who it affects\n\n- Aircraft owners and operators of Beechcraft Model C-18S and AT-11 aeroplanes (Applicability).  \n- Any maintenance organisation or technician who performs the modification according to the referenced documents.\n\n# When it must be done\n\n- The directive requires compliance \"Forthwith,\" meaning the modification must be carried out without delay (Compliance: Forthwith).\n\n# Why it matters (stated purpose and practical implications)\n\n- As an Airworthiness Directive, it is presented as addressing an airworthiness or safety concern for the control wheel shaft on the models listed (source: title and nature of instrument). The text itself does not set out technical reasoning or an explicit hazard description; it instead mandates the modification by reference to the listed technical documents (Document list).  \n\n- Who pays: owners/operators bear the cost of arranging and performing the modification, including parts, labour and any downtime required (implied by the requirement to comply and the Applicability/Document list).  \n\n- What decisions are required: operators must choose which of the listed documents to follow for the modification (Beechcraft SB C-18-9, FAA AD 48-51-1, or ANO 105.1.4.3.6.7) and schedule the work promptly (Document list; Compliance).  \n\n- Compliance burden and implementation: the directive delegates the technical method to external documents; to comply an operator needs access to and to follow the specified service bulletin or airworthiness directive, and to certify the aircraft as modified once the work is complete (Document list).  \n\n- Bureaucratic discretion and timing: the AD sets an immediate compliance timeframe (\"Forthwith\"), which limits discretionary delay by regulators or operators (Compliance). There is no additional procedural carve-out or phased compliance schedule in the text provided.  \n\n# Trade-offs and risks (mechanisms, not value judgements)\n\n- Concentrated obligations: the cost and operational interruption fall directly on the identifiable set of owners/operators of the two models specified (Applicability).  \n\n- Reliance on external technical material: the AD does not itself contain procedural detail; it relies on one of three external documents to specify the technical modification. That requires affected parties to obtain and apply those documents (Document list).  \n\n- Immediate compliance raises scheduling and resource risks for operators who must make changes promptly (Compliance: Forthwith).  \n\n# How to proceed practically\n\n- Confirm whether your aircraft is a Model C-18S or AT-11 (Applicability).  \n- Obtain the specified technical document you will use (Beechcraft SB C-18-9; FAA AD 48-51-1; or ANO 105.1.4.3.6.7) and follow its instructions (Document list).  \n- Arrange maintenance without delay and retain records showing the modification was completed to meet the \"Forthwith\" requirement (Compliance).\n\n(References in parentheses refer to sections of the directive: Applicability; Document list; Compliance: Forthwith.)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive focused specifically on control wheel shaft modification for two Beechcraft 18 variants. It has not expanded beyond its original narrow technical purpose."},"complexity_factors":["Extremely short — only 8 substantive lines of regulatory text","No defined terms section; relies entirely on external technical documents","Simple conditional structure: applies to specific models, compliance is immediate","Cross-references are straightforward pointers to three alternative technical standards","No exceptions, exemptions, or nested conditions"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) issued by the Civil Aviation Safety Authority (CASA) — essentially a mandatory safety order for aircraft.\n\n**What it requires:** Owners and operators of specific Beechcraft 18 Series aeroplanes (Model C-18S and AT-11) must modify the **control wheel shaft** \"forthwith\" (immediately). This addresses a safety defect in the aircraft's steering/control mechanism.\n\n**Who it affects:** Anyone who owns, operates, or maintains these specific Beechcraft 18 models in Australia.\n\n**How to comply:** Follow one of three technical documents:\n- Beechcraft Service Bulletin C-18-9 (manufacturer's instructions), **or**\n- FAA AD 48-51-1 (the US equivalent safety order), **or**  \n- ANO 105.1.4.3.6.7 (an old Australian National Order reference)\n\n**Why it matters:** Control wheel shafts are critical to pilot control of the aircraft. A defect here could cause loss of control. The \"forthwith\" compliance means this is urgent — no grace period.\n\n**Note:** This appears to be a legacy directive (referencing documents from 1948 and old Australian National Orders), likely maintained in the current CASA register for historical compliance tracking."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-18-7-control-wheel-shaft-modification","history":"/api/acts/ad-beech-18-7-control-wheel-shaft-modification/history","analysis":"/api/acts/ad-beech-18-7-control-wheel-shaft-modification/analysis","conflicts":"/api/acts/ad-beech-18-7-control-wheel-shaft-modification/conflicts","importantCases":"/api/acts/ad-beech-18-7-control-wheel-shaft-modification/important-cases","documents":"/api/acts/ad-beech-18-7-control-wheel-shaft-modification/documents"}}