{"id":"F2006B03107","name":"AD/B747/208 - Wing Front Spar Web at Inboard Engine Struts","slug":"ad-b747-208-wing-front-spar-web-at-inboard-engine-struts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42479,"registerId":"commonwealth-F2006B03107-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/208 - Wing Front Spar Web at Inboard Engine Struts","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/B747/208 Wing Front Spar Web at Inboard Engine Struts 8/99\n\nApplicability: Model 747-100, 747-200, and 747-SP series aircraft; as listed in Boeing Service Bulletin 747-57A2303 Revision 1.\n\n \n\nRequirement: Action in accordance with the technical requirements of FAA AD 99-10-09 Amdt 39- 11162.\n\n \n\nCompliance: As specified in the Requirement Document for the initial and repetitive inspection requirements with a revised effective date of 12 August 1999.\n\n \n\nThis Airworthiness Directive becomes effective on 12 August 1999.\n\n \n\nBackground: The FAA received reports of fatigue cracks on the aft surface of the wing front spar web. Such fatigue cracking could result in a fuel leak, and consequent increased risk of fire.\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":3,"scope_assessment":{"changed":false,"description":"No change of scope is evident in the text. The AD adopts FAA AD 99-10-09 and applies to the Boeing 747-100/200/SP aircraft listed in Boeing Service Bulletin 747-57A2303 Rev 1, with inspection requirements and a compliance schedule made effective 12 August 1999 (Applicability; Requirement; Compliance; Effective date)."},"complexity_factors":["Cross-reference to an external FAA airworthiness directive (FAA AD 99-10-09) and a Boeing Service Bulletin (747-57A2303 Rev 1) creates dependency on external technical documents (Requirement; Applicability).","Mandates both initial and repetitive inspections, imposing an ongoing compliance schedule rather than a one-off action (Compliance).","Technical subject matter: fatigue cracking of the wing front spar web at inboard engine struts requires specialised inspection methods and judgement (Title; Background).","Scope is limited to listed 747-100/200/SP variants, concentrating compliance obligations on operators of those models (Applicability).","Fixed effective date and formal adoption by the Civil Aviation Safety Authority establish an enforceable compliance start (Effective date; header)."],"plain_english_summary":"Requires operators of specified Boeing 747‑100/200/SP aircraft to perform initial and repetitive inspections of the wing front spar web at the inboard engine struts by following FAA AD 99‑10‑09 and Boeing Service Bulletin 747‑57A2303 Rev 1. CASA made the directive effective 12 August 1999.\n\nThis responds to FAA reports of fatigue cracks on the aft surface of the spar web that could cause fuel leaks and increase fire risk; the aircraft operator bears the compliance burden."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive implementing a specific safety inspection requirement. It has not expanded beyond its original purpose of addressing the identified fatigue cracking issue in the specified aircraft models."},"complexity_factors":["Very short document (under 200 words)","Only 4 operative paragraphs (Applicability, Requirement, Compliance, Background)","No defined terms section — relies entirely on external FAA document for technical details","Single cross-reference to Boeing Service Bulletin 747-57A2303 Rev 1 and FAA AD 99-10-09","No conditional logic or exceptions within the text itself","Straightforward command structure: identify aircraft → follow FAA rules → comply by specified dates"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific Boeing 747 aircraft.\n\n**What it does:** It requires owners and operators of certain older Boeing 747 models (the -100, -200, and -SP series) to inspect a critical part of the wing structure — specifically the \"front spar web\" near where the inboard engines attach. This inspection must follow technical instructions set out in a US Federal Aviation Administration (FAA) safety order (AD 99-10-09).\n\n**Why it matters:** The FAA found fatigue cracks (tiny fractures caused by repeated stress over time) in this wing component. If left unchecked, these cracks could cause fuel to leak from the wing, creating a serious fire risk. The directive mandates both initial inspections and ongoing repetitive checks to catch problems before they become dangerous.\n\n**Who it affects:** Airlines and operators flying the specified Boeing 747 models in Australia, plus any Australian-registered aircraft of these types worldwide.\n\n**Key dates:** The directive took effect on 12 August 1999, with inspections required according to the FAA's specified schedule."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-208-wing-front-spar-web-at-inboard-engine-struts","history":"/api/acts/ad-b747-208-wing-front-spar-web-at-inboard-engine-struts/history","analysis":"/api/acts/ad-b747-208-wing-front-spar-web-at-inboard-engine-struts/analysis","conflicts":"/api/acts/ad-b747-208-wing-front-spar-web-at-inboard-engine-struts/conflicts","importantCases":"/api/acts/ad-b747-208-wing-front-spar-web-at-inboard-engine-struts/important-cases","documents":"/api/acts/ad-b747-208-wing-front-spar-web-at-inboard-engine-struts/documents"}}