{"id":"F2006B03205","name":"AD/B747/311 - Section 42 Skin and Doubler at Ground Exhaust Valve Cutout","slug":"ad-b747-311-section-42-skin-and-doubler-at-ground-exhaust-valve-cutout","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42577,"registerId":"commonwealth-F2006B03205-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/311 - Section 42 Skin and Doubler at Ground Exhaust Valve Cutout","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Safety Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](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 issues the following Airworthiness Directive (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\nBoeing 747 Series Aeroplanes\n\nAD/B747/311 Section 42 Skin and Doubler at Ground Exhaust\n\nValve Cutout\n\n  \n9/2004\n\nApplicability: Model 747-400 and \\-400D series aircraft, as listed in paragraph 1.A., “Effectivity,” of Boeing Alert Service Bulletin 747-53A2340 Revision 2, dated 24 April 2003.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 2004-13-15 Amdt 39-13697.\n\nCompliance: As specified in the Requirement document, with a revised effective date of 2 September 2004.\n\nThis Airworthiness Directive becomes effective on 2 September 2004.\n\nBackground: Skin cracks have been found on Boeing’s fatigue test article at the skin cutout for the ground exhaust valve for the cooling system for electrical equipment.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 23 July 2004\n\n![](image.001.png)\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 11 August 2004.\n\n  \n\nPage 1 of 1","sortOrder":0}],"analysis":{"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive adopts the FAA AD requirements for the specified 747-400/-400D effectivity and sets an Australian effective date (2 September 2004). It does not expand applicability or introduce additional measures beyond the FAA AD and referenced Boeing service bulletin."},"complexity_factors":["Direct incorporation by reference of an external FAA AD (2004-13-15) rather than reproducing requirements","Applicability limited to aircraft listed in a specific Boeing service bulletin (effectivity reference)","Technical work involves structural inspection and possible repairs (fatigue/crack correction)","Fixed compliance timing (effective date revised) reduces scheduling flexibility","Administrative burden: traceability to service bulletin and FAA AD for compliance evidence"],"plain_english_summary":"This directive requires operators of certain Boeing 747-400 and -400D aircraft (as listed in Boeing Alert Service Bulletin 747-53A2340 Rev 2) to carry out inspections and any corrective work specified in FAA Airworthiness Directive 2004-13-15, addressing skin cracking at the ground exhaust valve cutout. The action must be done in the circumstances, manner and timing set out in that FAA AD, and becomes effective on 2 September 2004. Operators bear the compliance cost and must update maintenance records accordingly."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope. It addresses a specific structural fatigue issue identified in testing and applies only to specific Boeing 747 variants. There is no evidence of scope creep — it does not expand to other aircraft types, other structural sections, or unrelated systems."},"complexity_factors":["Very short document (1 page)","Only 4 defined structural elements (Section 42, skin, doubler, ground exhaust valve cutout)","Single cross-reference to external technical document (FAA AD 2004-13-15) — the actual detailed instructions are contained there, not here","No nested conditions or exceptions — straightforward applicability and compliance structure","Minimal conditional logic: simple model-based applicability (747-400 and -400D series only)"],"plain_english_summary":"This AD makes mandatory the FAA’s safety order (FAA AD 2004-13-15) for certain Boeing 747-400 and 747-400D airplanes, requiring inspections and corrective action for cracks in the fuselage skin around the ground exhaust valve cutout. It affects operators of the models listed in Boeing Alert Service Bulletin 747-53A2340 Rev 2 and matters because unchecked cracks can cause decompression or structural failure. Effective date: 2 September 2004."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-311-section-42-skin-and-doubler-at-ground-exhaust-valve-cutout","history":"/api/acts/ad-b747-311-section-42-skin-and-doubler-at-ground-exhaust-valve-cutout/history","analysis":"/api/acts/ad-b747-311-section-42-skin-and-doubler-at-ground-exhaust-valve-cutout/analysis","conflicts":"/api/acts/ad-b747-311-section-42-skin-and-doubler-at-ground-exhaust-valve-cutout/conflicts","importantCases":"/api/acts/ad-b747-311-section-42-skin-and-doubler-at-ground-exhaust-valve-cutout/important-cases","documents":"/api/acts/ad-b747-311-section-42-skin-and-doubler-at-ground-exhaust-valve-cutout/documents"}}