{"id":"F2006B02593","name":"AD/B-2/21 - Conversion of Fuel Pump Model RD 7790D3 and E to G","slug":"ad-b-2-21-conversion-of-fuel-pump-model-rd-7790d3-and-e-to-g","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41853,"registerId":"commonwealth-F2006B02593-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B-2/21 - Conversion of Fuel Pump Model RD 7790D3 and E to G","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-2/21 Conversion of Fuel Pump Model NK\n\nRD 7790D3 and E to G\n\n \n\nApplicability: All model B-2. Document:  1. Brantly SB No. 16; or\n\n2. FAA AD 62-5-2.\n\n \n\nCompliance: Forthwith.\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\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Based on the text supplied, the directive's scope is clear and limited: it applies to all Brantly B‑2 helicopters and mandates conversion of fuel pump models RD 7790D3 and RD 7790E to RD 7790G. The document does not indicate any expansion or narrowing of scope from any prior instrument within the text provided. The AD refers implementers to Brantly SB No.16 or FAA AD 62‑5‑2 for technical details but does not alter the population to which the requirement applies. (Title; Applicability; Document; Compliance)"},"complexity_factors":["Short, single‑action directive with clear mandatory requirement (low structural complexity) (Title; Applicability; Compliance)","Immediate compliance timing ('Forthwith') increases operational urgency and practical complexity for implementers (Compliance)","No technical procedure included in the AD text; reliance on external documents (Brantly SB No.16 or FAA AD 62‑5‑2) requires operators to obtain and follow separate material (Document)","Applies to all aircraft of a model class (broad applicability increases population affected but not legal complexity) (Applicability)","No exemptions, alternative compliance mechanisms, or staged implementation described in the provided text (Compliance)","Authority and enforcement are implicit via CASA/Part 39 heading but the AD does not set out administrative steps for verification or approval of work (Header)"],"plain_english_summary":"What this instrument does (mechanics)\n\n- This is an airworthiness directive issued under the Commonwealth Civil Aviation Regulations, Part 39 (Civil Aviation Safety Authority — Schedule of Airworthiness Directives). The directive requires that fuel pumps of model RD 7790D3 and RD 7790E be converted to model RD 7790G on Brantly B‑2 series helicopters. (Title; Applicability)\n- The directive applies to all Brantly B‑2 helicopters. (Applicability)\n- It directs compliance \"Forthwith\" and points operators to the procedures in either Brantly Service Bulletin No. 16 or FAA AD 62‑5‑2 for carrying out the conversion. (Compliance; Document)\n\nWho it affects\n\n- Owners and operators of Brantly B‑2 helicopters must have the specified fuel pump conversion carried out. (Applicability; Compliance)\n- The Civil Aviation Safety Authority (CASA) is the issuing authority under the referenced regulatory framework. (Header)\n\nWhy it matters (source statements and practical implications)\n\n- The text of the directive itself does not state the specific technical hazard or incident that prompted the requirement. It does, however, mandate the hardware conversion and points to the supplier/service documents that contain the technical instructions. (Title; Document)\n\nPractical consequences, incentives and trade‑offs\n\n- Who pays: The costs of parts, labour and aircraft downtime to perform the conversion fall on the aircraft owners/operators, because the AD imposes a mandatory technical change on affected aircraft. (Applicability; Compliance)\n- What operators must do: Arrange for and complete the conversion in accordance with Brantly SB No. 16 or FAA AD 62‑5‑2, and do so forthwith. The AD text does not include the conversion procedure itself; operators must consult the cited documents for technical steps and parts. (Document; Compliance)\n- Compliance burden and timing: The instruction to comply \"Forthwith\" creates immediate implementation pressure; operators will need to schedule work, obtain parts and accept aircraft downtime without delay. (Compliance)\n- Administrative discretion: The printed text contains no alternative compliance route, exemption, or staged timeline; the directive as provided is prescriptive. If any variation or delegation is available, it is not set out in the text supplied. (Compliance)\n- Trade‑offs and opportunity costs: Immediate mandatory work shifts operator resources (money, maintenance hours, runway/flight schedule availability) toward the conversion. Any intended safety or technical benefit is realised only after operators incur these costs; the directive does not describe the expected magnitude of that benefit in the text provided. (Title; Document)\n- Effects on private choice and markets: The directive constrains owners/operators’ choices by imposing a required technical configuration. It may concentrate demand for specific parts or approved maintenance services specified in the cited documents, but those procurement and service effects are not detailed in the AD text. (Document)\n\nWhere to find the technical steps\n\n- The AD requires following either Brantly SB No. 16 or FAA AD 62‑5‑2 for the conversion procedure; the AD text does not reproduce the technical instructions itself. Operators must consult those documents to implement the conversion. (Document)\n\nShort, practical summary\n\n- Mandatory conversion of fuel pump models RD 7790D3/E to RD 7790G on all Brantly B‑2 helicopters, to be completed immediately by following Brantly SB No. 16 or FAA AD 62‑5‑2. Costs, parts, labour and downtime are borne by owners/operators. The directive’s text does not state the specific hazard or explain enforcement or alternative compliance options; it is prescriptive and relies on the cited documents for technical detail. (Title; Applicability; Document; Compliance)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on fuel pump conversion. It has not expanded beyond its original safety purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 1 substantive operational requirement (fuel pump conversion)","No defined terms section","No cross-references to other legislation beyond two external technical documents","Simple unconditional language ('Forthwith') with no exceptions or conditional logic","Single applicability criterion (all B-2 models)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order — issued by Australia's Civil Aviation Safety Authority (CASA) for **Brantly B-2 series helicopters**.\n\n**What it does:**\n- Requires owners and operators to **convert specific fuel pump models** (RD 7790D3 and RD 7790E) to **model RD 7790G**.\n- This is a hardware modification to prevent potential fuel system failures.\n\n**Who it affects:**\n- Anyone who owns or operates a **Brantly B-2 helicopter** (all variants of this model).\n\n**Why it matters:**\n- Fuel pump failures can cause engine stoppage in flight, which is obviously catastrophic in a helicopter. This directive mandates a fix to keep these aircraft safe to fly.\n\n**Compliance deadline:**\n- **\"Forthwith\"** — meaning immediately, with no grace period. Operators must do this before the next flight.\n\n**Technical basis:**\n- The directive references two documents that explain how to do the conversion:\n  1. Brantly Service Bulletin No. 16 (from the manufacturer)\n  2. FAA Airworthiness Directive 62-5-2 (the US aviation regulator's equivalent order)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b-2-21-conversion-of-fuel-pump-model-rd-7790d3-and-e-to-g","history":"/api/acts/ad-b-2-21-conversion-of-fuel-pump-model-rd-7790d3-and-e-to-g/history","analysis":"/api/acts/ad-b-2-21-conversion-of-fuel-pump-model-rd-7790d3-and-e-to-g/analysis","conflicts":"/api/acts/ad-b-2-21-conversion-of-fuel-pump-model-rd-7790d3-and-e-to-g/conflicts","importantCases":"/api/acts/ad-b-2-21-conversion-of-fuel-pump-model-rd-7790d3-and-e-to-g/important-cases","documents":"/api/acts/ad-b-2-21-conversion-of-fuel-pump-model-rd-7790d3-and-e-to-g/documents"}}