{"id":"F2006B02590","name":"AD/B-2/19 - Transmission Mount Lugs - Reinforcement","slug":"ad-b-2-19-transmission-mount-lugs-reinforcement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41846,"registerId":"commonwealth-F2006B02590-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B-2/19 - Transmission Mount Lugs - Reinforcement","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-2/19  Transmission Mount Lugs - Reinforcement 9/61 Applicability:              Model B-2 prior to S/No. 103 fitted with 0.250\" thick transmission mounting lugs. Document:               1. Brantly SB No. 14; or\n\n2. FAA AD 61-16-4.\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\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 transmission lug reinforcement."},"complexity_factors":["Extremely short document (approximately 150 words of substantive content)","Only 2 defined applicability criteria (model type and serial number range)","Simple binary compliance structure (follow Document 1 OR Document 2)","No nested exceptions, conditional clauses, or cross-references to other legislation","Single, unambiguous compliance deadline ('Forthwith')","No interpretation section or defined terms"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) that mandates urgent safety work on specific Brantly B-2 helicopters.\n\n**What it does:**\n- Requires immediate reinforcement of the **transmission mount lugs** (the metal brackets that hold the helicopter's transmission/gearbox in place) on certain Brantly B-2 helicopters.\n- These lugs were originally made with 0.250\" thick metal, which was found to be insufficiently strong.\n\n**Who it affects:**\n- Owners and operators of **Brantly B-2 helicopters** with **serial numbers below 103** that have the thinner (0.250\") transmission mounting lugs.\n\n**Why it matters:**\n- The transmission mount lugs are critical structural components. If they fail, the transmission could detach from the airframe, causing catastrophic loss of control.\n- The directive uses the word **\"Forthwith\"** for compliance, which in aviation safety terms means **immediately** — do not fly until the fix is done.\n\n**How to comply:**\n- Follow the instructions in either:\n  - Brantly Service Bulletin No. 14, **or**\n  - FAA Airworthiness Directive 61-16-4 (the US aviation safety regulator's equivalent directive).\n\nThis is a **mandatory safety order** — it is not optional, and non-compliance means the aircraft cannot legally fly."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument itself defines a narrow, specific scope: Model B-2 helicopters prior to serial number 103 fitted with 0.250\" transmission mounting lugs must be reinforced using the named documents, with immediate effect. The text provides no indication that the scope differs from this stated technical focus, nor does it reference any broadened or narrowed coverage beyond the Applicability clause."},"complexity_factors":["Narrow technical scope limited to Brantly B-2 aircraft prior to S/No. 103 with 0.250\" transmission mount lugs (Applicability) — reduces breadth but concentrates complexity on specific airframes","Mandated immediate compliance (\"Forthwith\") increases operational urgency and logistical complexity (Compliance)","Reliance on external technical documents (Brantly SB No.14; FAA AD 61-16-4) requires access to and interpretation of those documents (Document)","Technical nature of the required work (structural reinforcement) requires qualified maintenance personnel and may need parts, tooling and downtime","Absence of alternative procedures or deferral provisions in the text increases practical implementation risk for operators","Enforcement and exemption details not specified in the instrument text, leaving regulatory follow-up and interpretation to implementing authorities"],"plain_english_summary":"This AD requires immediate reinforcement of the transmission mounting lugs on Brantly B‑2 helicopters (S/Ns before 103) fitted with 0.250\" lugs, to be done per Brantly Service Bulletin No.14 or FAA AD 61‑16‑4. \n\nOwners, operators and maintenance organisations must carry out and pay for the work, accept possible short‑notice grounding and source parts/qualified labour; compliance is mandatory and prescriptive."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b-2-19-transmission-mount-lugs-reinforcement","history":"/api/acts/ad-b-2-19-transmission-mount-lugs-reinforcement/history","analysis":"/api/acts/ad-b-2-19-transmission-mount-lugs-reinforcement/analysis","conflicts":"/api/acts/ad-b-2-19-transmission-mount-lugs-reinforcement/conflicts","importantCases":"/api/acts/ad-b-2-19-transmission-mount-lugs-reinforcement/important-cases","documents":"/api/acts/ad-b-2-19-transmission-mount-lugs-reinforcement/documents"}}