{"id":"F2006B03175","name":"AD/B747/28 Amdt 3 - Main Deck Pressure Web and Floor Beams - Inspection and Modification","slug":"ad-b747-28-amdt-3-main-deck-pressure-web-and-floor-beams-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42547,"registerId":"commonwealth-F2006B03175-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/28 Amdt 3 - Main Deck Pressure Web and Floor Beams - Inspection and 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/B747/28\n\nAmdt 3\n\n\nMain Deck Pressure Web and Floor Beams - Inspection and Modification\n\n\n9/83\n\n \n\nApplicability: All models listed in Boeing SB No. 747-53-2224, Rev. 3. Document:  Boeing SB No. 747-53-2224, Rev. 3.\n\nNote: FAA AD 83-11-02 AMDT. 39-4659 refers.\n\n \n\nCompliance: As per requirement document.\n\n \n\nBackground: Amdt. 3 is issued to introduce FAA AD 83-11-02 which supersedes AD 81-13-03.\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":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amdt. 3 updates the Australian AD framework by introducing the requirements of FAA AD 83-11-02 and superseding the earlier AD 81-13-03. The change means operators previously subject to AD 81-13-03 must now comply with the inspection and modification requirements as set out in the newer FAA AD and Boeing Service Bulletin No. 747-53-2224, Rev. 3 (Background; Note; Document)."},"complexity_factors":["Cross-reference to external technical documents (Boeing SB No. 747-53-2224 Rev.3) — the AD does not include procedural detail","Reference to an external regulator's AD (FAA AD 83-11-02) requiring cross-jurisdictional alignment","Applicability limited to models listed in the service bulletin, so determination of scope requires consulting that list","Technical nature of inspections and modifications (structural aircraft components) implying specialised maintenance capability","Amendment history: this is an amendment (Amdt. 3) that supersedes a prior AD (AD 81-13-03), requiring comparison to prior requirements to determine changes"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of the specific Boeing 747 models listed in Boeing Service Bulletin 747-53-2224, Rev. 3 to carry out inspections and modifications to the main deck pressure web and floor beams by following that service bulletin (which adopts FAA AD 83-11-02). CASA enforces the AD; maintenance organisations must perform the work and absorb the labour, parts and downtime costs since the AD delegates technical detail and timing to the referenced documents."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a routine amendment to an existing airworthiness directive. Amendment 3 simply updates the regulatory reference to match a new FAA directive and supersedes the previous version. The scope remains unchanged: inspection and modification of main deck pressure web and floor beams on Boeing 747 aircraft."},"complexity_factors":["Very short document (approximately 200 words)","Only 2 defined references (Boeing SB No. 747-53-2224 Rev. 3 and FAA AD 83-11-02)","No conditional logic or nested exceptions — compliance is straightforward 'as per requirement document'","Single applicability criterion (all models in specified service bulletin)","No interpretation section or defined terms","Simple amendment structure (supersedes one prior directive, introduces one new FAA directive)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nThis directive requires owners and operators of **Boeing 747 aircraft** to inspect and potentially modify specific structural components: the **main deck pressure web and floor beams**. These are critical parts of the fuselage (the main body of the plane) that help maintain cabin pressure and support the floor structure.\n\n**Who it affects:**\n- Airlines and operators flying Boeing 747 models covered by Boeing Service Bulletin 747-53-2224, Revision 3\n- Maintenance organisations servicing these aircraft\n- Anyone responsible for the airworthiness of affected Boeing 747s\n\n**Why it matters:**\nThis directive was updated (Amendment 3) to align with a US Federal Aviation Administration (FAA) safety order. The update supersedes an earlier directive (AD 81-13-03) and mandates specific inspections and modifications to prevent potential structural failures that could compromise flight safety. Compliance is mandatory — operators must follow the requirements in the referenced Boeing document to keep their aircraft legally airworthy."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-28-amdt-3-main-deck-pressure-web-and-floor-beams-inspection-and-modification","history":"/api/acts/ad-b747-28-amdt-3-main-deck-pressure-web-and-floor-beams-inspection-and-modification/history","analysis":"/api/acts/ad-b747-28-amdt-3-main-deck-pressure-web-and-floor-beams-inspection-and-modification/analysis","conflicts":"/api/acts/ad-b747-28-amdt-3-main-deck-pressure-web-and-floor-beams-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-b747-28-amdt-3-main-deck-pressure-web-and-floor-beams-inspection-and-modification/important-cases","documents":"/api/acts/ad-b747-28-amdt-3-main-deck-pressure-web-and-floor-beams-inspection-and-modification/documents"}}