{"id":"F2006B02089","name":"AD/AC/3 - Aileron Bellcrank Castings at Wing Station 196 - Replacement","slug":"ad-ac-3-aileron-bellcrank-castings-at-wing-station-196-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41319,"registerId":"commonwealth-F2006B02089-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC/3 - Aileron Bellcrank Castings at Wing Station 196 - Replacement","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,Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes,Aileron Bellcrank Castings at Wing Station 196 - Replacement,3\ntitle: Airworthiness Directive - AD/AC/3 - Aileron Bellcrank Castings at Wing Station 196 - Replacement\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/3  Aileron Bellcrank Castings at NK Wing Station 196 - Replacement\n\nApplicability: Model 520: S/Nos. 31 and subsequent. All models 560, 560A and 680. Document:  1.              Aero Commander SB No. 41; or\n\n2. FAA AD 57-9-1.\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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This appears to be the original scope of the directive. Airworthiness Directives are typically narrow, targeted safety instruments addressing specific defects in specific aircraft types. There is no evidence of scope creep; the directive precisely targets one mechanical component (aileron bellcrank castings) at one structural location (Wing Station 196) on defined aircraft models, which aligns with standard AD practice."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 4 defined applicability criteria (specific model numbers and serial number range)","No nested conditional logic or exceptions","Single compliance requirement with immediate effect ('Forthwith')","Only 2 reference documents cited","No interpretation section or defined terms","Straightforward mechanical directive with clear physical scope (one specific component at one specific location)"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it like a compulsory recall notice, but for aircraft parts.\n\n**What it requires:** Owners and operators of specific **Twin Commander aeroplanes** (models 520, 560, 560A, and 680) must **replace the aileron bellcrank castings** located at \"Wing Station 196\" (a specific structural point on the wing). An aileron bellcrank is a mechanical component that helps control the ailerons — the hinged surfaces on wings that make the plane bank left or right.\n\n**Who it affects:** \n- **Model 520:** Serial numbers 31 and onwards\n- **All** Model 560, 560A, and 680 aircraft\n\n**When it must be done:** **Forthwith** — meaning immediately, before further flight.\n\n**Why it matters:** The directive references a manufacturer service bulletin (Aero Commander SB No. 41) and an earlier US safety order (FAA AD 57-9-1), suggesting these castings have a known defect that could compromise flight control. If the bellcrank fails, the pilot could lose control of the ailerons, creating a serious safety risk.\n\n**The bottom line:** If you own or operate one of these specific Twin Commander aircraft, you cannot fly until you replace this part."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Based on the text provided, the instrument’s scope is to mandate replacement of the aileron bellcrank castings at wing station 196 for the listed Twin Commander models and serial numbers, using the referenced service/AD documents, with immediate effect. There is no information in the excerpt indicating a change from an earlier or original scope; the directive as presented sets that replacement requirement and applicability."},"complexity_factors":["Narrow technical scope (single component, specified wing station) reduces overall legal complexity.","Immediate mandatory compliance term \"Forthwith\" increases operational urgency and reduces flexibility.","Cross-reference to external technical documents (Aero Commander SB No. 41 or FAA AD 57-9-1) requires consult of other materials for procedural detail.","Limited procedural detail in the directive itself (no timelines, no exceptions, no enforcement mechanism specified in the excerpt).","A serial-number threshold for Model 520 (S/Nos. 31 and subsequent) requires record checks by operators to determine applicability."],"plain_english_summary":"This AD mandates immediate replacement of the aileron bellcrank castings at wing station 196 on specified Twin Commander aeroplanes (Model 520 S/N 31+, and all 560/560A/680), using Aero Commander SB No. 41 or FAA AD 57-9-1 procedures.\n\nIt affects owners, operators, maintenance organisations and parts suppliers; the \"forthwith\" timing shifts costs, downtime and sourcing risk onto operators and can cause operational disruption if parts or approved maintenance capacity are limited."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-3-aileron-bellcrank-castings-at-wing-station-196-replacement","history":"/api/acts/ad-ac-3-aileron-bellcrank-castings-at-wing-station-196-replacement/history","analysis":"/api/acts/ad-ac-3-aileron-bellcrank-castings-at-wing-station-196-replacement/analysis","conflicts":"/api/acts/ad-ac-3-aileron-bellcrank-castings-at-wing-station-196-replacement/conflicts","importantCases":"/api/acts/ad-ac-3-aileron-bellcrank-castings-at-wing-station-196-replacement/important-cases","documents":"/api/acts/ad-ac-3-aileron-bellcrank-castings-at-wing-station-196-replacement/documents"}}