{"id":"F2006B03093","name":"AD/B747/191 - Engine Fire Detection","slug":"ad-b747-191-engine-fire-detection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42465,"registerId":"commonwealth-F2006B03093-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/191 - Engine Fire Detection","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBoeing 747 Series Aeroplanes\n\nAD/B747/191 Engine Fire Detection 12/98\n\nApplicability: Model 747 series aeroplanes fitted with Rolls-Royce RB211-524G/H engines. Requirement: Modify the engine fire detection system in accordance with Boeing Alert Service\n\nBulletin 747-26A2250 dated 26 June 1997.\n\nNote: FAA AD 98-17-13 Amdt 39-10715 and Rolls-Royce PLC Service Bulletin RB.211-26-C101 refer.\n\nCompliance: At the next engine shop visit of the engine but no later than 5 November 2003.\n\nThis Airworthiness Directive becomes effective on 5 November 1998.\n\nBackground: The FAA has received a report advising of a combuster burn-through event that damaged the engine fire detection system such that no fire warning was annunciated on the flight deck. This directive implements a modification which is intended to prevent failure of the engine fire detector system to annunciate a fire warning message to flight crew following a severe engine failure. Failure to annunciate a fire warning could lead to delayed or improper flight crew response to the engine failure.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope aligns with its stated purpose: to prevent failure of the engine fire detection system on specified engines by mandating a particular modification within the stated compliance window. It targets a defined subset of aircraft/engines and does not expand beyond that aim."},"complexity_factors":["Technical specificity: applies only to Boeing 747s with Rolls‑Royce RB211‑524G/H engines and a particular Boeing service bulletin (precision increases implementation complexity).","Compliance timing: 'next engine shop visit but no later than 5 November 2003' creates scheduling and operational planning needs for operators.","Inter-jurisdictional references: cites FAA AD 98‑17‑13 and Rolls‑Royce service bulletin, requiring cross‑referencing of multiple documents.","Implementation logistics: modification likely requires engine‑shop resources, parts and certificated maintenance personnel.","Regulatory clarity: requirement is single, prescriptive action (low legal complexity) but depends on technical execution details in the referenced service bulletin."],"plain_english_summary":"This airworthiness directive requires Boeing 747 aeroplanes with Rolls‑Royce RB211‑524G/H engines to have their engine fire‑detection systems modified in line with Boeing Alert Service Bulletin 747‑26A2250 (dated 26 June 1997). Compliance must occur at the engine's next shop visit and no later than 5 November 2003.\n\nThe change responds to a reported combustor burn‑through that could disable cockpit fire warnings; the modification is intended to restore reliable annunciation. Aircraft operators/engine owners must arrange and pay for the work and accept associated downtime."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific technical defect in a specific aircraft/engine combination. It has not expanded beyond its original purpose."},"complexity_factors":["Very short document (under 200 words)","Single, clear applicability criterion (specific aircraft model and engine type)","Single compliance requirement with reference to external technical document","No defined terms section","No nested conditional logic or exceptions","Straightforward deadline structure (next shop visit OR hard date, whichever comes first)"],"plain_english_summary":"This CASA Airworthiness Directive mandates a modification to the engine fire detection system on Boeing 747s equipped with Rolls‑Royce RB211‑524G/H engines, to be carried out per Boeing Alert Service Bulletin 747‑26A2250. It responds to an incident where combustor burn‑through disabled fire warning, risking undetected engine fire.\n\nAffected operators must comply by the next engine workshop visit and no later than 5 November 2003; the AD took effect 5 November 1998."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-191-engine-fire-detection","history":"/api/acts/ad-b747-191-engine-fire-detection/history","analysis":"/api/acts/ad-b747-191-engine-fire-detection/analysis","conflicts":"/api/acts/ad-b747-191-engine-fire-detection/conflicts","importantCases":"/api/acts/ad-b747-191-engine-fire-detection/important-cases","documents":"/api/acts/ad-b747-191-engine-fire-detection/documents"}}