{"id":"F2006B06549","name":"AD/RB211/19 Amdt 6 - Combustion Liner","slug":"ad-rb211-19-amdt-6-combustion-liner","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48263,"registerId":"commonwealth-F2006B06549-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/RB211/19 Amdt 6 - Combustion Liner","content":"![](image.001.png)\n\nAIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/RB211/19 Amdt 5 and issues the following AD under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nRolls Royce Turbine Engines \\- RB211 Series\n\nAD/RB211/19\n\nAmdt 6\n\n  \nCombustion Liner 4/2004\n\nApplicability: RB211 engines as detailed in Rolls Royce Alert Service Bulletin (ASB) RB.211-72- AB482 Revision 9 dated 28 July 2003.\n\nRequirement: 1. To detect evidence of combustion liner head section distress which could result in a break-out of combustion, carry out an inspection of the combustion liner in accordance with:\n\n    (a) Rolls Royce ASB RB.211-72-AB482 Revision 9, or\n\n    (b) As detailed in an inspection procedure approved by CASA in accordance with Civil Aviation Regulation 2A, (4).\n\n2. Incorporate modifications as detailed in Rolls-Royce SB RB211-72-9670 or RB211-72-9764.\n\nIncorporation of the modifications referred to in Requirement 2 of this Directive constitutes terminating action for this Directive.\n\nNote: CAA UK AD G-2003-0011 refers.\n\nCompliance: 1. As detailed in the elected requirement document.\n\n2. At the next shop visit when the 04 module is refurbished or overhauled, but no later than 31 December 2012.\n\nThis Amendment becomes effective on 15 April 2004.\n\nBackground: This directive was originally issued to address a report of a combustion break-out which resulted in an under cowl fire penetrating the engine pylon. The directive required a periodic inspection of the combustion liner head section and meterpanel assemblies.\n\nThis amendment is issued to reduce the inspection interval for RB211-524B engines and also introduces a terminating action.\n\nRolls Royce Turbine Engines \\- RB211 Series\n\nAD/RB211/19 Amdt 6 (continued)\n\nAmendment 5 was issued to reflect the latest revision to the manufacturer’s inspection procedure document. The revision, in part, adds engines incorporating RB211-72- 7221 standard combustion liner head sections.\n\nAmendment 4 was issued in July 1997 and reduced the inspection threshold and added the RB211-524D4 engine.\n\nAmendment 5 of the Airworthiness Directive became effective on 7 October 1999\\. Amendment 4 of this Airworthiness Directive became effective on 17 July 1997.\n\n![Signature of James Coyne Delegate of the Civil Aviation Safety Authority](image.002.png)  \nAmendment 3 of this Airworthiness Directive became effective on 5 December 1996\\. The original issue of this Airworthiness Directive became effective on 9 November 1995.\n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 4 March 2004\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 24 March 2004.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This amendment (Amdt 6) changed the scope compared to the original AD by (a) reducing the inspection interval for RB211-524B engines, thereby expanding the immediacy/frequency of surveillance on that subset, and (b) introducing a formal terminating action—mandating specific Rolls-Royce service bulletin modifications (RB211-72-9670 or RB211-72-9764) that, once incorporated, end the need for the recurring inspections. The net effect shifts the compliance regime from indefinite periodic inspections to a pathway that leads to a one-time modification (at overhaul or by a fixed deadline)."},"complexity_factors":["Short, single-airworthiness-directive format with limited parts","References to multiple external documents (Rolls-Royce ASB RB.211-72-AB482 Rev 9; SB RB211-72-9670; SB RB211-72-9764; CAA UK AD G-2003-0011)","Two-step compliance structure (periodic inspection OR CASA-approved procedure; plus mandatory modification as terminating action)","Temporal condition allowing deferral until next 04 module overhaul but with an absolute deadline (31 December 2012)","Regulatory discretion point: CASA approval under Civil Aviation Regulation 2A(4) for alternate procedures","Engine-model distinctions (e.g. RB211-524B noted for reduced inspection interval) and historical amendments referenced"],"plain_english_summary":"**What this directive does (mechanically):**\n\n- **Applies to:** Rolls-Royce RB211 series turbine engines listed in Rolls-Royce Alert Service Bulletin (ASB) RB.211-72-AB482 Revision 9 (28 July 2003) (Applicability).\n- **Main actions required (Requirement):**\n  - 1) Operators must inspect the combustion liner head section to look for signs of distress that could lead to combustion break-out. The inspection must follow either the Rolls-Royce ASB RB.211-72-AB482 Revision 9 or an inspection procedure that CASA has expressly approved under Civil Aviation Regulation 2A(4).\n  - 2) Operators must incorporate specific modifications described in Rolls-Royce Service Bulletin (SB) RB211-72-9670 or SB RB211-72-9764. Installing either of those modifications ends (is a \"terminating action\" for) the inspection requirement.\n- **When to comply (Compliance):**\n  - Inspections: as scheduled in the chosen inspection document (the ASB or an approved alternative).\n  - Modifications: at the next shop visit when the engine 04 module is refurbished or overhauled, and in any case no later than 31 December 2012.\n- **Why it was issued (Background / stated reason):** The directive was issued to detect and prevent combustion liner head section distress. That distress had led to at least one reported combustion break-out and under-cowl fire that penetrated the engine pylon. This amendment shortens the inspection interval for RB211-524B engines and adds a terminating modification option (Amendment 6).\n\n**Who it affects and who pays:**\n\n- Affected parties: aircraft operators and maintenance organisations that own, operate or maintain the specified Rolls-Royce RB211 engines.\n- Who pays: operators/maintenance providers pay for the inspections and for any required modifications at shop visit/overhaul.\n\n**How it changes behaviour and choices:**\n\n- Operators must either follow the manufacturer’s inspection procedure or get a CASA-approved alternative. That imposes a compliance choice: periodic inspection (ongoing cost and downtime) versus implementing the modification (one-time cost at overhaul, after which inspections are no longer required under this AD).\n- The compliance window lets operators defer modification until the next 04 module overhaul/ refurbishment but imposes a hard deadline (31 December 2012) to force ultimate compliance.\n\n**Implementation, compliance and regulatory discretion:**\n\n- CASA enforces the AD under CASR subregulation 39.1(1). CASA also can approve alternate inspection procedures under Civil Aviation Regulation 2A(4), which leaves a degree of regulatory discretion for acceptable alternatives (Requirement 1(b)).\n- The AD relies on external manufacturer documents (the Rolls-Royce ASB and two SBs). Compliance therefore depends on the availability, clarity and update status of those documents and on operators’ ability to schedule shop visits/overhauls.\n\n**Costs, incentives and trade-offs (brief testing of the stated purpose):**\n\n- Benefits claimed: earlier detection of combustion-liner distress reduces the risk of combustion break-out and associated fires (Background).\n- Direct costs: recurring inspection labour/time and any parts; or one-time modification cost and associated shop visit downtime. Costs are concentrated on aircraft operators and MROs (maintenance organisations).\n- Incentives: because the AD permits deferral of modification until overhaul (but with a final deadline), operators may prefer to postpone the one-time cost until scheduled maintenance to avoid unscheduled downtime. That reduces immediate expense but keeps the operator subject to recurring inspections and any residual risk until modification is installed.\n- Implementation risk: effectiveness depends on correct execution of inspections per the ASB or CASA-approved procedures, timely scheduling of shop visits, and clarity of the manufacturer’s service documents. Enforcement depends on CASA oversight.\n\n**Practical takeaways:**\n\n- If you operate an affected RB211 engine, you must inspect the combustion liner as directed and plan to install one of the specified SB modifications at your next 04 module overhaul (or earlier), and by the hard deadline. Completing the modification removes the need for the periodic inspections required by this AD.\n\n(References: Applicability; Requirement 1 and 2; Compliance 1 and 2; Background.)"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The original 1995 directive required only periodic inspections. Over successive amendments (4, 5, and now 6), the scope expanded to: (1) cover additional engine variants (RB211-524D4, engines with -7221 standard liners), (2) shorten inspection intervals for specific models, and (3) introduce permanent modifications as terminating action. The 2012 hard deadline for modifications also represents a shift from open-ended inspection requirements to a definitive compliance endpoint."},"complexity_factors":["Short, single-purpose document (2 pages)","Only 4 defined references (to external technical documents: ASB RB.211-72-AB482 Rev 9, SB RB211-72-9670, SB RB211-72-9764, and UK AD G-2003-0011)","Simple conditional structure: inspect OR use CASA-approved alternative; then modify","Clear terminating action (modification ends the obligation)","Single cross-reference to enabling legislation (Civil Aviation Regulation 2A(4))","Historical amendment trail provided for context but doesn't complicate current obligations"],"plain_english_summary":"This CASA Airworthiness Directive orders inspections and mandatory modifications to Rolls‑Royce RB211 combustion liners to detect and fix cracks that can lead to engine fires burning through the engine pylon. It affects airlines, operators and maintenance organisations using RB211‑equipped aircraft. Inspections follow the manufacturer's bulletin and the modification must be done by the next major overhaul or, at the latest, 31 December 2012, to permanently close out the requirement."},"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-rb211-19-amdt-6-combustion-liner","history":"/api/acts/ad-rb211-19-amdt-6-combustion-liner/history","analysis":"/api/acts/ad-rb211-19-amdt-6-combustion-liner/analysis","conflicts":"/api/acts/ad-rb211-19-amdt-6-combustion-liner/conflicts","importantCases":"/api/acts/ad-rb211-19-amdt-6-combustion-liner/important-cases","documents":"/api/acts/ad-rb211-19-amdt-6-combustion-liner/documents"}}