{"id":"F2006B02588","name":"AD/B-2/17 - Elimination of Carburettor Manifold From Oil System","slug":"ad-b-2-17-elimination-of-carburettor-manifold-from-oil-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41844,"registerId":"commonwealth-F2006B02588-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B-2/17 - Elimination of Carburettor Manifold From Oil System","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-2/17 Elimination of Carburettor Manifold From Oil System\n\nApplicability: Model B-2 prior to S/No. 95. Document:  1. Brantly SB No. 12; or\n\n2. FAA AD 61-11-2.\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\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\n7/61\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive. It addresses one specific mechanical modification for one aircraft type. There is no evidence of scope creep; the directive remains tightly focused on its original safety purpose."},"complexity_factors":["Extremely short — approximately 100 words of substantive content","No defined terms section","No cross-references to other legislation (only references to external technical documents)","Single, unambiguous compliance requirement ('Forthwith')","Simple applicability test (model and serial number)","No conditional logic, exceptions, or nested provisions"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety order — for owners and operators of Brantly B-2 helicopters built before serial number 95.\n\n**What it requires:** The directive orders the immediate removal of the carburettor manifold from the helicopter's oil system. This appears to address a design flaw where a component meant for fuel/air mixing (the carburettor manifold) was incorrectly integrated into the lubrication system, creating a potential safety risk.\n\n**Who must comply:** Anyone operating a Brantly B-2 helicopter with serial number below 95. \"Forthwith\" means immediately — there's no grace period.\n\n**Why it matters:** Oil system contamination or failure in a helicopter can cause catastrophic engine failure. This AD eliminates a hazardous configuration that could allow fuel or air to contaminate the oil supply, or vice versa.\n\n**Technical basis:** The directive references two documents that provide the proper procedure:\n- Brantly Service Bulletin No. 12 (manufacturer's instructions)\n- FAA AD 61-11-2 (the US aviation safety regulator's equivalent order)\n\n**The bottom line:** If you fly one of these specific helicopters, you must immediately modify the oil system to remove the carburettor manifold. No exceptions, no delays."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The directive changes the certified configuration of affected aircraft by requiring elimination of the carburettor manifold from the oil system for Brantly B-2 helicopters with serial numbers prior to 95. The AD prescribes immediate corrective action and refers operators to Brantly SB No. 12 or FAA AD 61-11-2 for the technical procedure (Applicability; Document; Compliance)."},"complexity_factors":["Narrow applicability: applies only to Brantly B-2 helicopters with S/No. prior to 95 (Applicability)","Immediate compliance requirement increases urgency but not procedural complexity (Compliance)","Technical procedure is not contained in the AD text; compliance depends on external documents (Brantly SB No.12 or FAA AD 61-11-2) (Document)","No alternatives or exemptions stated in this text, limiting discretion but simplifying legal interpretation","Operational complexity (maintenance work, potential grounding) is real but typical for an AD and depends on the external procedure"],"plain_english_summary":"What this directive does (mechanical change)\n\n- The Airworthiness Directive requires that the carburettor manifold be removed (eliminated) from the oil system on certain Brantly B-2 helicopters. (See title and AD text.)\n- The AD applies to Brantly Model B-2 helicopters with serial numbers prior to 95. (Applicability)\n- The AD points operators to two documents that describe the corrective action and/or procedure: Brantly Service Bulletin No. 12 or FAA AD 61-11-2. (Document)\n- The required action is mandatory immediately: the AD states “Compliance: Forthwith.” (Compliance)\n\nWho is affected and who decides\n\n- Owners and operators of Brantly B-2 helicopters with serial numbers before 95 are the parties required to act (Applicability).\n- The Civil Aviation Safety Authority issued this airworthiness directive and relies on the Brantly service bulletin or the FAA AD for the technical steps to perform the removal (Document).\n\nWhy it matters (stated purpose and practical trade-offs)\n\n- The instrument is an airworthiness directive that changes the certified configuration of the affected aircraft by removing the carburettor manifold from the oil system (title and action). The AD itself does not set out detailed rationale in this text; it prescribes the corrective action and points to the cited technical documents for the procedure (Document).\n\nCosts, incentives and who pays\n\n- The direct financial and time costs of carrying out the removal (parts, labour, aircraft downtime) will be borne by the owners/operators of the applicable B-2 helicopters. (Applicability; Compliance.)\n- Maintenance providers or certified mechanics will be the parties who perform the work according to the referenced documents, creating demand for that labour and any required parts or inspections (Document).\n\nCompliance burden and implementation risk\n\n- Compliance is required immediately (“Forthwith”), so affected operators must schedule and complete the work promptly or remain non-compliant. (Compliance.)\n- The AD text does not include the step‑by‑step procedure in this notice; operators must consult Brantly SB No. 12 or FAA AD 61-11-2 for the technical method and acceptance criteria, so practical compliance depends on access to and following those documents. (Document.)\n- Because the AD replaces a component in the oil system, the work will involve mechanical modification of the aircraft systems; that creates the usual maintenance risks (need for qualified personnel, potential temporary grounding) inherent in aircraft modification, which the AD leaves to the referenced technical documents to address. (Document; Compliance.)\n\nDiscretion and alternatives\n\n- This AD cites a specific corrective action and two source documents; the text provided here does not include any alternative compliance pathways or exemptions. Operators seeking alternatives would need to refer to the issuing authority or the referenced documents for any prescribed approval process. (Document; Compliance.)\n\nNet practical effect (behaviour change)\n\n- Affected operators must remove the carburettor manifold from the oil system on applicable Brantly B-2 helicopters promptly and follow the procedures set out in Brantly SB No. 12 or FAA AD 61-11-2. (Applicability; Document; Compliance.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b-2-17-elimination-of-carburettor-manifold-from-oil-system","history":"/api/acts/ad-b-2-17-elimination-of-carburettor-manifold-from-oil-system/history","analysis":"/api/acts/ad-b-2-17-elimination-of-carburettor-manifold-from-oil-system/analysis","conflicts":"/api/acts/ad-b-2-17-elimination-of-carburettor-manifold-from-oil-system/conflicts","importantCases":"/api/acts/ad-b-2-17-elimination-of-carburettor-manifold-from-oil-system/important-cases","documents":"/api/acts/ad-b-2-17-elimination-of-carburettor-manifold-from-oil-system/documents"}}