{"id":"F2012L00879","name":"AD/RB211/45 - Air - IP Cabin Air Offtake Ducting","slug":"ad-rb211-45-air-ip-cabin-air-offtake-ducting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":89228,"registerId":"commonwealth-F2012L00879-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/RB211/45 | Air - IP Cabin Air Offtake Ducting | 8/2012 |\n| ----------- | ---------------------------------- | ------ |\n\n| Applicability: | RB211-524G and -524H engines installed in Boeing 747 and 767 as specified in the requirement document.                                                                                              |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Perform an inspection and torque check in accordance with Rolls-Royce Service Bulletin No. 75-9159 Revision 5 dated January 27, 2003 or later approved revision.Note: UK CAA AD G-029-04-90 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-029-04-90 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/RB211/45","sectionType":"part","heading":"AD/RB211/45","content":"## AD/RB211/45","sortOrder":1},{"sectionNumber":"Air - IP Cabin Air Offtake Ducting","sectionType":"part","heading":"Air - IP Cabin Air Offtake Ducting","content":"## Air \\- IP Cabin Air Offtake Ducting","sortOrder":2},{"sectionNumber":"8/2012","sectionType":"part","heading":"8/2012","content":"## 8/2012","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope aligns with the state‑of‑design (UK) AD: it explicitly mandates the UK CAA AD G‑029‑04‑90 for the same RB211‑524G/‑524H engines on listed Boeing 747/767 aircraft. The instrument does not expand applicability beyond the engines/airframes identified; it formalises mandatory compliance within Australia (Applicability; Background)."},"complexity_factors":["Narrow technical applicability limited to RB211‑524G and RB211‑524H engines on specified Boeing 747 and 767 airframes (Applicability)","Requirement references an external manufacturer Service Bulletin (No. 75‑9159 Rev 5) rather than restating procedures, creating dependency on that document (Requirement)","Compliance timing left to the 'requirement document' as periodic intervals, creating potential ambiguity for scheduling and record‑keeping (Compliance)","Mandation of an overseas AD (UK CAA G‑029‑04‑90) by CASA requires cross‑jurisdictional alignment but does not create new technical obligations beyond the referenced AD (Background)","Operational impact is procedural (inspection and torque check) rather than requiring design changes, so technical complexity is low but there is an ongoing maintenance cost borne by operators (Requirement; Compliance)"],"plain_english_summary":"Requires operators of Rolls‑Royce RB211‑524G and RB211‑524H engines on specified Boeing 747 and 767 aircraft to perform periodic inspections and torque checks of the IP cabin air offtake ducting following Rolls‑Royce Service Bulletin No. 75‑9159 Revision 5 (or later). CASA adopted the UK CAA AD (G‑029‑04‑90) and made compliance mandatory from 30 April 2012. Operators pay for the inspections/repairs and must schedule maintenance to meet the service‑bulletin intervals to keep affected aircraft airworthy."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope. It addresses a specific technical issue (IP cabin air offtake ducting) on specific engine models, exactly as intended when CASA reviewed and mandated the UK CAA's original directive. There is no evidence of scope creep or expansion beyond the original safety purpose."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 2 defined applicability criteria (engine models and aircraft types)","Single, clear compliance requirement referencing an external technical standard","No nested exceptions, conditional logic, or cross-references to other legislation","Straightforward periodic compliance schedule ('as specified in the requirement document')","Minimal legal drafting — primarily technical reference to an existing service bulletin"],"plain_english_summary":"This CASA Airworthiness Directive mandates periodic inspections and torque checks of the IP cabin air offtake ducting on Rolls‑Royce RB211‑524G/H engines (used on Boeing 747/767) per Rolls‑Royce Service Bulletin 75‑9159 Rev 5 (or later). It affects airlines and maintenance crews; compliance is legally required to prevent loose fittings that could cause loss of cabin pressurisation, smoke/fumes ingress, or engine/airframe damage."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-rb211-45-air-ip-cabin-air-offtake-ducting","history":"/api/acts/ad-rb211-45-air-ip-cabin-air-offtake-ducting/history","analysis":"/api/acts/ad-rb211-45-air-ip-cabin-air-offtake-ducting/analysis","conflicts":"/api/acts/ad-rb211-45-air-ip-cabin-air-offtake-ducting/conflicts","importantCases":"/api/acts/ad-rb211-45-air-ip-cabin-air-offtake-ducting/important-cases","documents":"/api/acts/ad-rb211-45-air-ip-cabin-air-offtake-ducting/documents"}}