{"id":"F2012L00880","name":"AD/RB211/44 - Powerplant - Fuel Flow Regulator Adjustment Test","slug":"ad-rb211-44-powerplant-fuel-flow-regulator-adjustment-test","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":89229,"registerId":"commonwealth-F2012L00880-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Rolls Royce Turbine Engines - RB211 Seri","sectionType":"division","heading":"Rolls Royce Turbine Engines - RB211 Series","content":"### Rolls Royce Turbine Engines \\- RB211 Series\n\n| AD/RB211/44 | Powerplant - Fuel FlowRegulator Adjustment Test | 8/2012 |\n| ----------- | ----------------------------------------------- | ------ |\n\n| Applicability: | RB211-524D4 engines installed in Boeing 747 aircraft as specified in the requirement document.                                                                                                                  |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Perform a health check on the fuel flow regulator in accordance with Rolls-Royce Service Bulletin No. 71-7383 Revision 3 dated September 2, 1988 or later approved revision.Note: UK CAA AD G-010-05-84 refers. |\n| Compliance:    | Periodically as specified in the requirement document.                                                                                                                                                          |\n|                | This Airworthiness Directive becomes effective on 30 April 2012.                                                                                                                                                |\n| Background:    | CASA has reviewed state-of-design ADs applicable to RB211 engines and decided G-010-05-84 should be explicitly mandated for Australian aircraft.                                                                |\n\n![](image.001.png)\n\nMike Higgins  \nDelegate of the Civil Aviation Safety Authority\n\n16 April 2012","sortOrder":0},{"sectionNumber":"AD/RB211/44","sectionType":"part","heading":"AD/RB211/44","content":"## AD/RB211/44","sortOrder":1},{"sectionNumber":"Powerplant - Fuel FlowRegulator Adjustme","sectionType":"part","heading":"Powerplant - Fuel FlowRegulator Adjustment Test","content":"## Powerplant \\- Fuel Flow  \nRegulator Adjustment Test","sortOrder":2},{"sectionNumber":"8/2012","sectionType":"part","heading":"8/2012","content":"## 8/2012","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"CASA explicitly mandated the state-of-design requirement (UK CAA AD G-010-05-84) for Australian-registered aircraft, making the Rolls‑Royce SB fuel‑flow regulator health check compulsory domestically rather than relying solely on the original state's AD. This aligns Australia with the referenced CAA AD and delegates interval detail to the referenced requirement document (Background; Requirement; Applicability)."},"complexity_factors":["Narrow technical applicability limited to RB211‑524D4 engines on specified Boeing 747 aircraft (Applicability) — lowers breadth but concentrates impact on affected operators.","Mandated action depends on an external manufacturer Service Bulletin and allows later approved revisions, creating document-dependency and version-control complexity (Requirement).","Compliance timing is left to a separate 'requirement document' rather than stated in the AD, producing operational ambiguity about intervals (Compliance).","Adoption of a state-of-design AD (UK CAA G‑010‑05‑84) means cross-jurisdictional alignment and potential for differing interpretations (Background).","Practical implementation imposes scheduling, labour and parts costs on operators and maintenance organisations (Requirement/Compliance).","Effective date imposes a compliance timeline that operators must meet (Compliance: effective date 30 April 2012).","The AD’s text is short but relies on multiple external documents (service bulletin, requirement document, referenced CAA AD), increasing administrative and compliance oversight needs."],"plain_english_summary":"Requires periodic health checks of the fuel‑flow regulator on RB211‑524D4 engines installed in specified Boeing 747s, to be carried out per Rolls‑Royce Service Bulletin No. 71‑7383 Revision 3 (or later). CASA mandates compliance and set an effective date. Operators (airlines/owners) pay for and schedule the inspections; maintenance organisations perform them. The directive adopts UK CAA AD G‑010‑05‑84 and leaves exact intervals to the referenced requirement document."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — it addresses a specific safety issue with a specific engine component on specific aircraft. There is no evidence of scope creep; it remains a targeted maintenance requirement."},"complexity_factors":["Very short document (approximately 200 words)","Only 1 defined applicability criterion (specific engine model and aircraft type)","Single requirement referencing an external technical document (Rolls-Royce Service Bulletin)","No nested exceptions or conditional logic","No cross-references to other legislation beyond a note about the UK CAA AD","Straightforward compliance structure (periodic testing as per external document)"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires airlines and maintenance crews to perform recurring tests and verification of the fuel flow regulator on Rolls‑Royce RB211‑524D4 engines installed on Boeing 747s, using Rolls‑Royce Service Bulletin No. 71‑7383 Rev. 3. It affects operators of those aircraft because regulator failure can cause engine performance or safety issues. Effective from 30 April 2012."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-rb211-44-powerplant-fuel-flow-regulator-adjustment-test","history":"/api/acts/ad-rb211-44-powerplant-fuel-flow-regulator-adjustment-test/history","analysis":"/api/acts/ad-rb211-44-powerplant-fuel-flow-regulator-adjustment-test/analysis","conflicts":"/api/acts/ad-rb211-44-powerplant-fuel-flow-regulator-adjustment-test/conflicts","importantCases":"/api/acts/ad-rb211-44-powerplant-fuel-flow-regulator-adjustment-test/important-cases","documents":"/api/acts/ad-rb211-44-powerplant-fuel-flow-regulator-adjustment-test/documents"}}