{"id":"F2006B06764","name":"AD/SA-TP/16 - Control Column Inspection Hole","slug":"ad-sa-tp-16-control-column-inspection-hole","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114597,"registerId":"commonwealth-F2006B06764-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SA-TP/16 - Control Column Inspection Hole","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 above 5700 kg,British Aerospace (Scottish Aviation) Twin Pioneer Series Aeroplanes,Control Column Inspection Hole,16\ntitle: Airworthiness Directive - AD/SA-TP/16 - Control Column Inspection Hole\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)  British Aerospace (Scottish Aviation) Twin Pioneer Series Aeroplanes\n\n \n\nAD/SA-TP/16 Control Column Inspection Hole NK\n\nApplicability: All models.\n\n \n\nDocument: Scottish Aviation Mod. No. C860. Compliance: 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\n \n\n \n\nFederal Register of Legislative Instruments F2006B06764\n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The supplied text contains no indication that the instrument’s scope was altered from an earlier intent. It plainly applies to all Twin Pioneer models and mandates implementation of Scottish Aviation Mod. No. C860 forthwith; no amendment history or scope change is present in the provided text."},"complexity_factors":["Short, single-action directive with clear immediate compliance requirement","Applicability to all models increases operational scope but not legal ambiguity","Operational detail is contained in an external document (Scottish Aviation Mod. No. C860), requiring implementers to obtain and interpret that document","No technical rationale or detailed instructions in the directive text increases dependence on external technical material","Immediate compliance timeline (‘Forthwith’) raises scheduling and logistics complexity for operators"],"plain_english_summary":"This CASA Airworthiness Directive mandates immediate compliance with Scottish Aviation Modification No. C860 to modify the control‑column inspection hole on all British Aerospace (Scottish Aviation) Twin Pioneer series aeroplanes. It affects owners, operators and maintenance organisations who must obtain and carry out the mod forthwith; compliance is compulsory and may impose parts, labour and downtime costs."},"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive targeting a specific safety issue (control column inspection access) for a specific aircraft type (Twin Pioneer). It has not expanded beyond its original technical safety purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section","No cross-references to other legislation","Simple unconditional mandate: one action required for one aircraft type","No exceptions, exemptions, or conditional logic","Single compliance requirement with immediate effect"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) issued by the Civil Aviation Safety Authority (CASA). An Airworthiness Directive is a mandatory safety notice that tells aircraft owners and operators they must fix a specific problem to keep their aircraft safe to fly.\n\n**What it does:** This directive requires owners of British Aerospace (Scottish Aviation) Twin Pioneer aircraft to install a specific modification called \"Scottish Aviation Mod. No. C860.\" This modification creates an inspection hole in the control column (the steering wheel-like device the pilot uses to fly the plane). The hole allows mechanics to inspect the internal parts of the control column for wear, damage, or corrosion that could cause the controls to fail.\n\n**Who it affects:** Anyone who owns or operates a British Aerospace (Scottish Aviation) Twin Pioneer series aircraft, regardless of the specific model.\n\n**When it must be done:** \"Forthwith\" means immediately — as soon as practically possible, before the aircraft flies again.\n\n**Why it matters:** Control columns are critical safety components. If they fail, the pilot cannot steer the aircraft. This directive ensures hidden defects can be detected before they cause an accident."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sa-tp-16-control-column-inspection-hole","history":"/api/acts/ad-sa-tp-16-control-column-inspection-hole/history","analysis":"/api/acts/ad-sa-tp-16-control-column-inspection-hole/analysis","conflicts":"/api/acts/ad-sa-tp-16-control-column-inspection-hole/conflicts","importantCases":"/api/acts/ad-sa-tp-16-control-column-inspection-hole/important-cases","documents":"/api/acts/ad-sa-tp-16-control-column-inspection-hole/documents"}}