{"id":"F2012L01112","name":"AD/RB211/46 - State of Design Airworthiness Directives - 1","slug":"ad-rb211-46-state-of-design-airworthiness-directives-1","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":163104,"registerId":"commonwealth-F2012L01112-current","compilationNumber":null,"startDate":"2026-04-04","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/RB211/46 | State of Design Airworthiness Directives - 1 | 11/2012 |\n| ----------- | -------------------------------------------- | ------- |\n\n```html\n

Applicability:

RB211-524B2, C2, D4, G2, H and H-36 engines installed in Boeing 747 and 767 as specified in the requirement documents.

Requirement:

1. Determine the applicability of the Rolls-Royce Service Bulletins listed in
Table 1.

2. If it is determined that a Service Bulletin listed in Table 1 is applicable and has not been previously accomplished, perform the actions required by that Service Bulletin at the nominated date or later approved version.

Table 1

CAA AD

R-R SB

Date of SB

Title

G-012-05-84

72-6847

24 Feb 1989

Engine - IP and LP Compressor Location Bearings

G-003-07-92

71-9546

9 Oct 1992

Power Plant - Engine Front Mount

G-009-01-98

72-9764

23 Jan 1998

Engine - Combustion Section

Compliance:

Before further flight after the effective date of this Directive.

This Airworthiness Directive becomes effective on 8 June 2012.

Background:

CASA has reviewed state-of-design ADs applicable to RB211 engines and decided these UK ADs should be explicitly mandated for Australian aircraft. They require once-only actions for which the compliance date and/or period has passed.

\n```\n\n![](image.001.png)\n\nMike Higgins \nDelegate of the Civil Aviation Safety Authority\n\n25 May 2012","sortOrder":0},{"sectionNumber":"AD/RB211/46","sectionType":"part","heading":"AD/RB211/46","content":"## AD/RB211/46","sortOrder":1},{"sectionNumber":"State of Design Airworthiness Directives","sectionType":"part","heading":"State of Design Airworthiness Directives - 1","content":"## State of Design Airworthiness Directives - 1","sortOrder":2},{"sectionNumber":"11/2012","sectionType":"part","heading":"11/2012","content":"## 11/2012","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — adopting specific UK state-of-design airworthiness directives for RB211 engines. It does not expand beyond its intended purpose of mandating three specific service bulletins."},"complexity_factors":["Short, single-purpose directive with clear applicability table","Only 3 specific service bulletins referenced with straightforward cross-referencing","Simple conditional logic: check applicability → if applicable and not done → do the action","No nested exceptions or complex defined terms","Single compliance deadline with no alternative methods or phased implementation","Heavy reliance on external documents (Rolls-Royce Service Bulletins) for technical detail, keeping the legislative text brief"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of Rolls‑Royce RB211‑524B2/C2/D4/G2/H/H‑36 engines (on Boeing 747/767) to check whether three Rolls‑Royce Service Bulletins (covering IP/LP compressor bearings, the engine front mount, and the combustion section) apply and, if so, to carry out the described maintenance. These once‑only, mandatory actions adopt earlier UK requirements and must be done before the next flight after 8 June 2012."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"CASA converted state‑of‑design (UK) airworthiness directives into explicit Australian mandatory requirements by mandating the listed Rolls‑Royce Service Bulletins for affected Australian‑registered aircraft (Background). That change makes previously issued UK AD actions compulsory in Australia and requires operators to carry out once‑only actions even where the original compliance date or period has passed."},"complexity_factors":["Narrow technical scope: applies only to RB211‑524 B2/C2/D4/G2/H/H‑36 engines on Boeing 747/767 (Applicability).","Dependency on external documents: requires determination against manufacturer Rolls‑Royce Service Bulletins listed in Table 1, not full text in the Directive (Requirement 1–2; Table 1).","Once‑only actions with past compliance windows: mandates actions whose original compliance dates/periods have passed (Background), which raises retroactive execution and record‑checking burdens.","Immediate timing: compliance must be done before further flight after the effective date (Compliance), creating operational scheduling pressure.","Low regulator discretion: CASA adopts state‑of‑design UK ADs as binding rather than prescribing alternative mitigations (Background)."],"plain_english_summary":"This Directive requires operators of Rolls‑Royce RB211‑524 B2, C2, D4, G2, H and H‑36 engines installed on Boeing 747 and 767 aircraft to check the specific Rolls‑Royce Service Bulletins listed in Table 1 and, where applicable and not already done, carry out the Bulletin actions (or later approved versions). Compliance is required before further flight after the Directive’s effective date (8 June 2012); the specified actions are once‑only. CASA states it is explicitly mandating UK/state‑of‑design ADs for Australian aircraft, so operators pay compliance costs and must complete any overdue work."},"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-rb211-46-state-of-design-airworthiness-directives-1","history":"/api/acts/ad-rb211-46-state-of-design-airworthiness-directives-1/history","analysis":"/api/acts/ad-rb211-46-state-of-design-airworthiness-directives-1/analysis","conflicts":"/api/acts/ad-rb211-46-state-of-design-airworthiness-directives-1/conflicts","importantCases":"/api/acts/ad-rb211-46-state-of-design-airworthiness-directives-1/important-cases","documents":"/api/acts/ad-rb211-46-state-of-design-airworthiness-directives-1/documents"}}