{"id":"F2006B03267","name":"AD/B747/9 - Fuel Valve Actuator - Modification","slug":"ad-b747-9-fuel-valve-actuator-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42691,"registerId":"commonwealth-F2006B03267-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/9 - Fuel Valve Actuator - Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Boeing 747 Series Aeroplanes\n\n \n\nAD/B747/9 Fuel Valve Actuator - Modification 8/77\n\nApplicability: All models.\n\n \n\nDocument: FAA AD 77-12-07 Amdt. 39-2924.\n\n \n\nCompliance: As detailed in the requirement document.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive from 1977 addressing a specific mechanical component. It has not expanded beyond its original purpose of mandating fuel valve actuator modifications."},"complexity_factors":["Extremely short document (under 200 words)","No defined terms section","No conditional logic or exceptions","Single cross-reference to external FAA document (incorporation by reference)","No procedural steps described within the instrument itself"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety order — for all Boeing 747 aircraft operating in Australia.\n\n**What it requires:** Aircraft owners and operators must modify the **fuel valve actuators** (the mechanical components that control fuel flow to the engines) according to specifications laid out in a US Federal Aviation Administration (FAA) document (AD 77-12-07).\n\n**Who it affects:** Anyone who owns, operates, or maintains Boeing 747 series aircraft in Australian airspace.\n\n**Why it matters:** Fuel valve actuators are critical safety components. If they malfunction, engines could lose fuel supply or receive uncontrolled fuel flow — potentially causing engine failure or fire. This directive ensures a known defect gets fixed before it causes an accident.\n\n**Key point:** The actual technical work isn't described in this document. Instead, it \"incorporates by reference\" the FAA directive — meaning operators must go find and follow that US document to comply."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The text provided does not indicate any change in scope relative to the directive as stated: it applies to all Boeing 747 models and requires the fuel valve actuator modification by reference to FAA AD 77-12-07 Amdt. 39-2924. No amendment, narrowing, or extension of applicability is recorded in the supplied text (AD/B747/9; Applicability: All models; Document: FAA AD 77-12-07 Amdt. 39-2924)."},"complexity_factors":["The instrument is very short and omits technical and timing details (Compliance: As detailed in the requirement document).","Mandatory reliance on an external document (FAA AD 77-12-07 Amdt. 39-2924) increases practical complexity because operators must obtain and interpret that document (Document: FAA AD 77-12-07 Amdt. 39-2924).","Broad applicability to 'All models' creates potentially heterogeneous implementation demands across different aircraft variants (Applicability: All models).","Enforceability rests on regulatory framework (Civil Aviation Regulations 1998, Part 39) which requires operators to map this short directive onto the regulatory compliance process.","Absence of cost, parts, labour, or downtime estimates in the text means operational impact must be determined from the requirement document, adding uncertainty for planning (Compliance: As detailed in the requirement document)."],"plain_english_summary":"This Airworthiness Directive mandates a modification to the fuel valve actuator on all Boeing 747 aircraft, creating a legal compliance obligation for owners and operators. It delegates technical steps, timing and costs to the referenced FAA AD (77-12-07 Amdt. 39-2924), leaving operators to obtain that document, schedule and fund the work while CASA enforces the requirement under Part 39."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-9-fuel-valve-actuator-modification","history":"/api/acts/ad-b747-9-fuel-valve-actuator-modification/history","analysis":"/api/acts/ad-b747-9-fuel-valve-actuator-modification/analysis","conflicts":"/api/acts/ad-b747-9-fuel-valve-actuator-modification/conflicts","importantCases":"/api/acts/ad-b747-9-fuel-valve-actuator-modification/important-cases","documents":"/api/acts/ad-b747-9-fuel-valve-actuator-modification/documents"}}