{"id":"F2006B08796","name":"AD/DC3/19 - Aileron Trim Tab Control Rod - Inspection","slug":"ad-dc3-19-aileron-trim-tab-control-rod-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52150,"registerId":"commonwealth-F2006B08796-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DC3/19 - Aileron Trim Tab Control Rod - Inspection","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\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)  Douglas DC3 Series Aeroplanes\n\n \n\nAD/DC3/19 Aileron Trim Tab Control Rod - Inspection NK\n\nApplicability: All models.\n\n \n\nRequirement: 1. Inspect the aileron trim tab control rod for signs of chafing due to insufficient clearance at the point where the rod passes through the diagonal stiffening plate between the aileron main spar and the aileron rib.\n\n \n\n2. If chafing of the rod has taken place, increase the radius of the hole by the minimum amount necessary to ensure clearance throughout the full movement of the control.\n\n \n\nOR ANOs Part 100 Appendix “A” Notice No. 7/22; OR ANO 105.1.16.1.6.4.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original purpose of addressing the chafing issue in DC-3 aileron trim tab control rods."},"complexity_factors":["Very short document (under 200 words)","Only 2 substantive requirements (inspect; repair if needed)","Single defined applicability (all DC-3 models)","Minimal cross-referencing (3 alternative compliance pathways listed but not elaborated)","No nested conditional logic or exceptions","Technical but straightforward mechanical instruction"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nThis directive requires owners and operators of **Douglas DC-3 aircraft** (a vintage twin-engine propeller plane, famous from the 1930s-40s) to inspect a specific part — the **aileron trim tab control rod**. This rod helps adjust the small movable surfaces on the wing that keep the plane flying level.\n\n**The problem:**\nThe control rod can rub against (\"chafe\") a metal plate inside the wing structure because there's not enough clearance. This wear could eventually cause the part to fail.\n\n**What must be done:**\n- **Inspect** the rod where it passes through a diagonal plate in the aileron structure for signs of rubbing/wear\n- **If wear is found:** enlarge the hole in the plate just enough to stop the rubbing throughout the full range of motion\n\n**Who it affects:**\nAnyone who owns or operates a Douglas DC-3 series aircraft in Australia.\n\n**Why it matters:**\nEven though these planes are old, many are still flying (for tourism, cargo, or historic purposes). This prevents a potential control system failure that could lead to loss of control in flight.\n\n**Compliance alternatives:**\nOperators can also follow equivalent instructions from other approved sources (British or US aviation notices listed at the end)."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive does not expand or narrow the set of affected aircraft beyond \"All models\" of the DC‑3 series; it prescribes an inspection and a narrowly defined corrective action only (Requirement 1–2). The inclusion of specific ANO compliance alternatives provides alternative procedural paths but does not change the substantive scope of which aircraft or the type of action required."},"complexity_factors":["Single, narrowly defined inspection location and single remedial action (Requirement 1–2)","Applicability limited to one aircraft family (all DC‑3 models), reducing scope complexity (Applicability)","Subjective standard \"minimum amount necessary\" introduces professional judgement and potential variability in execution (Requirement 2)","External compliance routes referenced (ANO Part 100 Appendix “A” Notice No. 7/22; ANO 105.1.16.1.6.4) create procedural alternatives that require checking additional documents","Operational impacts are limited but include scheduling, labour and minor structural work, which create modest compliance burden and downtime risk (Requirement 1–2)"],"plain_english_summary":"This directive requires operators of all Douglas DC‑3 models to have a qualified person inspect the aileron trim‑tab control rod where it passes through the diagonal stiffening plate for chafing, and—if found—enlarge the plate hole by the minimum amount needed to restore full control clearance. Compliance may alternatively be achieved by following the specified ANO notices."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dc3-19-aileron-trim-tab-control-rod-inspection","history":"/api/acts/ad-dc3-19-aileron-trim-tab-control-rod-inspection/history","analysis":"/api/acts/ad-dc3-19-aileron-trim-tab-control-rod-inspection/analysis","conflicts":"/api/acts/ad-dc3-19-aileron-trim-tab-control-rod-inspection/conflicts","importantCases":"/api/acts/ad-dc3-19-aileron-trim-tab-control-rod-inspection/important-cases","documents":"/api/acts/ad-dc3-19-aileron-trim-tab-control-rod-inspection/documents"}}