{"id":"F2006B03040","name":"AD/B747/138 - Fuselage - Upper Deck Tension Tie BS 780 to BS 940","slug":"ad-b747-138-fuselage-upper-deck-tension-tie-bs-780-to-bs-940","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42399,"registerId":"commonwealth-F2006B03040-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/138 - Fuselage - Upper Deck Tension Tie BS 780 to BS 940","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\n# AD/B747/138 Fuselage - Upper Deck Tension Tie BS 780 to BS 940\n\nApplicability: B747 Line No 001 to 203 inclusive.\n\n# 5/95\n\n \n\nRequirement: 1. Perform a detailed visual inspection of the outboard ends of the unmodified upper deck tension ties between BS 780 to BS 940. Inspect in accordance with Boeing SB 747-53-2371.\n\n \n\n2. Perform a detailed visual inspection of the outboard ends of the modified upper deck tension ties between BS 780 to BS 940. Inspect in accordance with Boeing SB 747-53-2371.\n\n \n\nNote: FAA AD 94-13-06 refers.\n\n \n\nCompliance: 1. Unless accomplished within the last 2000 flights, initially inspect the unmodified tension ties within 1000 flights from 27 April 1995.\n\n \n\nReinspect at intervals not exceeding 3000 flights.\n\n \n\n2. Initially inspect the modified tension ties before 10000 flights after modification. Reinspect at intervals not exceeding 6000 flights.\n\nBackground: Six operators have reported 47 cracked tension ties on 13 aircraft. Tension ties are critical to the continued structural integrity of the aircraft to the extent that failure of more than one tie can result in rapid depressurisation of the aircraft.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2300},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope focused on specific structural inspections of early-model Boeing 747 aircraft. It represents a targeted safety intervention without significant expansion beyond the initial fuselage integrity concern."},"complexity_factors":["Technical aviation terminology requiring specialized knowledge (tension ties, body stations)","Dual compliance tracks based on modification status","Cross-references to external technical standards (Boeing Service Bulletin 747-53-2371 and FAA AD 94-13-06)","Time-based compliance calculated in flight cycles rather than calendar dates"],"plain_english_summary":"This AD requires operators of early Boeing 747s (line numbers 001–203) to inspect upper‑deck tension ties between body stations 780–940 to prevent structural failure and rapid cabin depressurisation. Cracks have been found (47 ties on 13 aircraft), so unmodified ties need earlier and more frequent visual inspections than modified ties. Compliance deadlines and recurring intervals differ by modification status; affected owners/operators must follow the specified inspection schedule."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-138-fuselage-upper-deck-tension-tie-bs-780-to-bs-940","history":"/api/acts/ad-b747-138-fuselage-upper-deck-tension-tie-bs-780-to-bs-940/history","analysis":"/api/acts/ad-b747-138-fuselage-upper-deck-tension-tie-bs-780-to-bs-940/analysis","conflicts":"/api/acts/ad-b747-138-fuselage-upper-deck-tension-tie-bs-780-to-bs-940/conflicts","importantCases":"/api/acts/ad-b747-138-fuselage-upper-deck-tension-tie-bs-780-to-bs-940/important-cases","documents":"/api/acts/ad-b747-138-fuselage-upper-deck-tension-tie-bs-780-to-bs-940/documents"}}