{"id":"F2006B02580","name":"AD/B-2/1 - Tail Rotor Guard and Skid Assembly P/N B2-416 - Modification","slug":"ad-b-2-1-tail-rotor-guard-and-skid-assembly-p-n-b2-416-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41836,"registerId":"commonwealth-F2006B02580-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B-2/1 - Tail Rotor Guard and Skid Assembly P/N B2-416 - 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-2/1 Tail Rotor Guard and Skid Assembly P/N B2-416 - Modification\n\n\n12/60\n\n \n\nApplicability: All model B-2. Document: Brantly SB No. 1. 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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific helicopter model and a specific mechanical modification. It has not expanded beyond its original purpose of mandating a safety-critical hardware change."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","Single, unambiguous compliance requirement ('Forthwith')","No conditional logic, exceptions, or nested provisions","Clear applicability statement ('All model B-2')","Simple structure: title, applicability, reference document, compliance deadline"],"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).\n\n**What it does:** It requires owners and operators of **Brantly B-2 series helicopters** to modify their aircraft by installing a specific tail rotor guard and skid assembly (part number B2-416).\n\n**Who it affects:** Anyone who owns or operates a Brantly B-2 helicopter in Australia.\n\n**Why it matters:** The tail rotor is a critical component that keeps the helicopter stable and prevents it from spinning. This modification likely addresses a safety defect or vulnerability in the original design — possibly to protect the tail rotor from damage during ground operations or to improve structural integrity. The directive cites \"Brantly SB No. 1\" (Service Bulletin), which is the manufacturer's official technical notice describing the required fix.\n\n**When it must be done:** **\"Forthwith\"** means immediately — there's no grace period. As soon as this directive applies to an aircraft, the modification must be carried out before the helicopter can fly legally.\n\n**The bottom line:** If you fly a Brantly B-2 in Australia, you cannot legally operate it until you've installed this specific guard and skid assembly."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Based on the provided text, the directive's scope does not appear to change from its stated content: it applies to all Brantly B‑2 helicopters and mandates modification of P/N B2‑416 per Brantly SB No. 1 with immediate effect (\"Applicability: All model B-2\"; \"Document: Brantly SB No. 1\"; \"Compliance: Forthwith\"). The text contains no language indicating a change from an earlier scope or any amendment; it is a straightforward mandatory modification notice."},"complexity_factors":["Very short AD text with a single mandatory action reduces legal-interpretation complexity.","Immediate compliance requirement (\"Forthwith\") raises operational urgency and implementation complexity for operators.","The AD delegates technical detail to an external document (Brantly SB No. 1), creating dependency on that service bulletin for scope and method.","Applicability limited to a single aircraft type (all model B‑2) narrows affected population but concentrates costs.","No explanatory detail in the AD about the defect or inspection criteria increases reliance on maintenance and supplier channels to understand practical steps.","Issued under Part 39 AD process — enforcement and mandatory nature are clear, leaving little administrative discretion."],"plain_english_summary":"The airworthiness directive from the Civil Aviation Safety Authority requires all Brantly B‑2 owners/operators to have the tail rotor guard and skid assembly (P/N B2‑416) modified immediately (“forthwith”) in accordance with Brantly Service Bulletin No. 1. Compliance, parts, labour and downtime costs fall to operators; the AD delegates technical detail to the referenced service bulletin and creates reliance on its availability and on suppliers/maintenance capacity."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b-2-1-tail-rotor-guard-and-skid-assembly-p-n-b2-416-modification","history":"/api/acts/ad-b-2-1-tail-rotor-guard-and-skid-assembly-p-n-b2-416-modification/history","analysis":"/api/acts/ad-b-2-1-tail-rotor-guard-and-skid-assembly-p-n-b2-416-modification/analysis","conflicts":"/api/acts/ad-b-2-1-tail-rotor-guard-and-skid-assembly-p-n-b2-416-modification/conflicts","importantCases":"/api/acts/ad-b-2-1-tail-rotor-guard-and-skid-assembly-p-n-b2-416-modification/important-cases","documents":"/api/acts/ad-b-2-1-tail-rotor-guard-and-skid-assembly-p-n-b2-416-modification/documents"}}