{"id":"F2006B02592","name":"AD/B-2/20 - Increased Tail Rotor Control - Modification","slug":"ad-b-2-20-increased-tail-rotor-control-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41851,"registerId":"commonwealth-F2006B02592-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B-2/20 - Increased Tail Rotor Control - Modification","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)  Brantly B-2 Series Helicopters\n\n \n\nAD/B-2/20 Increased Tail Rotor Control - Modification NK\n\nApplicability: Model B-2 prior to S/No. 112. Document:  1. Brantly SB No. 15; or\n\n2. FAA AD 61-18-2.\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\ns\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 addressing a specific mechanical defect in a specific aircraft model. It has not expanded beyond its original purpose of mandating a tail rotor modification."},"complexity_factors":["Extremely short document (under 200 words)","Only one defined term implicitly referenced (serial number cutoff)","No cross-references to other legislation beyond optional FAA alternative","Simple binary applicability test (serial number < 112)","Single compliance requirement with no exceptions or conditions","No nested logic or procedural steps"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) requiring specific repairs or modifications to aircraft.\n\n**What it does:** This directive orders owners and operators of **Brantly B-2 helicopters** (specifically those with serial numbers before 112) to modify the tail rotor control system to increase its effectiveness. The modification must be done using either Brantly Service Bulletin No. 15 or an equivalent FAA (US aviation regulator) directive.\n\n**Who it affects:** Anyone who owns, operates, or maintains early-model Brantly B-2 helicopters in Australia.\n\n**Why it matters:** The tail rotor keeps a helicopter from spinning uncontrollably. If the control system isn't effective enough, the pilot could lose control of the aircraft. This directive fixes a known safety defect before it causes an accident.\n\n**When it must be done:** Immediately (\"forthwith\"). This isn't optional and can't be delayed."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The provided AD text does not indicate any change of scope from an earlier instrument or intent. It sets a targeted requirement: apply a tail-rotor control modification to Brantly B-2 helicopters with serial numbers prior to 112, using Brantly SB No. 15 or FAA AD 61-18-2, and requires compliance forthwith (Applicability; Document references; Compliance). There is no statement in the text that alters or expands the AD’s scope relative to a prior measure."},"complexity_factors":["Narrow and specific applicability (Model B-2 prior to S/No. 112) reduces scope complexity (Applicability).","Mandatory immediate compliance (“forthwith”) raises operational urgency but is administratively simple (Compliance).","Technical details are outsourced to external documents (Brantly SB No.15; FAA AD 61-18-2), which shifts complexity to obtaining and following those documents (Document references).","The AD text does not specify enforcement procedures, alternative compliance paths, or timelines beyond ‘‘forthwith’’, creating practical ambiguity for implementers.","Potential supply-chain dependence on parts/procedures named in the referenced service bulletin/FAA AD increases implementation complexity for operators."],"plain_english_summary":"This CASA Airworthiness Directive (Part 39) mandates an immediate modification to increase tail‑rotor control on Brantly B‑2 helicopters with serial numbers before 112. Compliance is required “forthwith” by following Brantly Service Bulletin No. 15 or FAA AD 61‑18‑2. Owners/operators and maintenance organisations must arrange and fund the work; CASA enforces the requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b-2-20-increased-tail-rotor-control-modification","history":"/api/acts/ad-b-2-20-increased-tail-rotor-control-modification/history","analysis":"/api/acts/ad-b-2-20-increased-tail-rotor-control-modification/analysis","conflicts":"/api/acts/ad-b-2-20-increased-tail-rotor-control-modification/conflicts","importantCases":"/api/acts/ad-b-2-20-increased-tail-rotor-control-modification/important-cases","documents":"/api/acts/ad-b-2-20-increased-tail-rotor-control-modification/documents"}}