{"id":"F2007L00119","name":"AD/B747/353 - Fuselage Skin Cracks aft of Left Main Door","slug":"ad-b747-353-fuselage-skin-cracks-aft-of-left-main-door","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":68214,"registerId":"commonwealth-F2007L00119-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 747 Series Aeroplanes","sectionType":"division","heading":"Boeing 747 Series Aeroplanes","content":"### Boeing 747 Series Aeroplanes\n\n| AD/B747/353 | Fuselage Skin Cracks aft of Left Main Door | 2/2007 |\n| ----------- | ------------------------------------------ | ------ |\n\n| Applicability: | Model 747-100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, -400D, -400F, 747SR, and 747SP series aircraft; as identified in Boeing Alert Service Bulletin747-53A2675, original issue, or later FAA approved revision.                                                             |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2006-24-05Amdt 39-14834.                                                                                                                                                                                                  |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of15 February 2007.                                                                                                                                                                                              |\n|                | This Airworthiness Directive becomes effective on 15 February 2007.                                                                                                                                                                                                                      |\n| Background:    | The FAA received a report of fatigue cracks detected in the skin in section 41 of the fuselage, on an in-service Model 747 aircraft. Such cracking, unless detected and corrected, could join together and cause a loss of structural integrity and rapid decompression of the aircraft. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n19 December 2006","sortOrder":0},{"sectionNumber":"AD/B747/353","sectionType":"part","heading":"AD/B747/353","content":"## AD/B747/353","sortOrder":1},{"sectionNumber":"Fuselage Skin Cracks aft of Left Main Do","sectionType":"part","heading":"Fuselage Skin Cracks aft of Left Main Door","content":"## Fuselage Skin Cracks aft of Left Main Door","sortOrder":2},{"sectionNumber":"2/2007","sectionType":"part","heading":"2/2007","content":"## 2/2007","sortOrder":3}],"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a narrow, specific scope: addressing a known safety defect in a particular aircraft type. It has not expanded beyond its original purpose of mandating inspection and repair of fuselage skin cracks."},"complexity_factors":["Very short document (approximately 200 words of substantive content)","Only 1 defined term implicitly referenced (the FAA AD number)","No nested conditional logic or exceptions","Single cross-reference to external technical document (FAA AD 2006-24-05)","Clear, direct applicability table with specific aircraft models listed","No internal definitions section or interpretation clauses","Straightforward compliance deadline with no phased or conditional requirements"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of certain Boeing 747 variants to inspect and repair fatigue cracks found behind the left main door, following FAA AD 2006-24-05. \n\nEffective 15 February 2007, the mandatory inspections and repairs aim to prevent crack propagation that could compromise fuselage integrity and cause rapid decompression, a serious safety hazard."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument references and adopts the technical requirements of FAA AD 2006-24-05 and identifies affected models via Boeing Alert Service Bulletin 747-53A2675. The only explicit alteration in this text is a revised effective date (15 February 2007); the directive does not indicate any substantive change to the original applicability or to the technical requirements themselves."},"complexity_factors":["Cross-reference to an external FAA AD (FAA AD 2006-24-05Amdt 39-14834) — requires operators to obtain and follow a separate, technical regulatory document (Requirement).","Dependence on a manufacturer service bulletin (Boeing Alert Service Bulletin 747-53A2675) to identify affected aircraft and procedures — increases document tracking and version-control obligations (Applicability).","Wide applicability across many Boeing 747 variants — means many operators and fleet types must check applicability (Applicability).","Technical nature of required work (fatigue inspection/repair) requiring qualified maintenance, parts and engineering judgement — operational and cost implications for operators (Background / Requirement).","Revised effective date (15 February 2007) alters the compliance timetable without changing substantive requirements (Compliance).","Urgency and safety risk (potential for joined cracks causing rapid decompression) increase priority and shortened timeframes for execution (Background).","Enforcement and administrative locus: issued by the Civil Aviation Safety Authority delegate, so national compliance and oversight rest with CASA (signature block)."],"plain_english_summary":"This Airworthiness Directive requires operators of specified Boeing 747 models to carry out the inspection and repair actions set out in FAA AD 2006-24-05 and the Boeing Alert Service Bulletin 747-53A2675. It applies to a wide range of 747 variants and became effective 15 February 2007. The directive targets fatigue cracks found in the fuselage skin aft of the left main door because, if left uncorrected, such cracks could join and cause loss of structural integrity and rapid decompression."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-353-fuselage-skin-cracks-aft-of-left-main-door","history":"/api/acts/ad-b747-353-fuselage-skin-cracks-aft-of-left-main-door/history","analysis":"/api/acts/ad-b747-353-fuselage-skin-cracks-aft-of-left-main-door/analysis","conflicts":"/api/acts/ad-b747-353-fuselage-skin-cracks-aft-of-left-main-door/conflicts","importantCases":"/api/acts/ad-b747-353-fuselage-skin-cracks-aft-of-left-main-door/important-cases","documents":"/api/acts/ad-b747-353-fuselage-skin-cracks-aft-of-left-main-door/documents"}}