{"id":"F2006B03079","name":"AD/B747/177 - Upper Deck Floor Beam at Sta. 980","slug":"ad-b747-177-upper-deck-floor-beam-at-sta-980","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42438,"registerId":"commonwealth-F2006B03079-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/177 - Upper Deck Floor Beam at Sta. 980","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBoeing 747 Series Aeroplanes\n\nAD/B747/177 Upper Deck Floor Beam at Sta. 980 9/97\n\nApplicability: Model 747-300 and \\-400 series aircraft with line numbers up to and including 843, and Model 747 series aircraft modified to a stretched upper deck configuration; on which an upper deck cart lift has been installed at station (STA) 980.\n\nRequirement: Inspect in accordance with the technical requirements of FAA AD 97-09-13 Amdt 39- 10009.\n\nNote: Boeing Service Bulletins 747-53-2327 and 747-53A2400 refer.\n\nCompliance: Unless already accomplished, as specified in the requirement document with a revised effective date of 14 August 1997.\n\nThis airworthiness directive becomes effective on 14 August 1997.\n\nBackground: The FAA received reports of extensive corrosion at STA. 980. Analysis of the corrosion indicated that fatigue cracking of the floor beam at this area could occur and cause the beam to break, and result in extensive damage to adjacent structure and possible rapid decompression of the aircraft.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical issue on specific aircraft models. It has not expanded beyond its original purpose of mandating inspection for corrosion at a specific structural location."},"complexity_factors":["Very short document (under 200 words)","Only 4 defined elements: applicability criteria (model numbers, line numbers, modification status, cart lift installation), one technical requirement reference, one compliance date, and background explanation","Single straightforward requirement: inspect per external technical document","No nested conditions or exceptions — applicability is a simple list of criteria","No cross-references to other legislation beyond the single FAA AD reference","Clear, unambiguous language throughout"],"plain_english_summary":"This Airworthiness Directive mandates inspection of the upper-deck floor beam at station 980 on certain Boeing 747-300/400s (line numbers ≤843) and any 747s with a stretched upper deck that have a cart lift installed there. Prompt inspection per the referenced FAA AD was required by 14 August 1997 to detect corrosion that could cause fatigue cracking, structural failure or rapid decompression. Compliance is mandatory."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"No change in scope from the instrument's stated purpose: it targets specific 747 models/line numbers with an upper-deck cart lift at STA 980 and requires inspections per FAA AD 97-09-13. The directive confines action to that defined subset and cites Boeing service bulletins for further detail (Applicability; Requirement; Note)."},"complexity_factors":["Targeted applicability by model, modification and line-number range (Applicability)","Mandated reliance on an external regulatory document for technical procedures (FAA AD 97-09-13) rather than reproducing procedures in the AD (Requirement)","Cross-reference to Bosch/Boeing service bulletins for details (Note)","Fixed compliance/effective date with potential for a revised effective date (Compliance)","Clear safety consequence triggering the AD (corrosion, fatigue cracking, possible rapid decompression) (Background)","Operational burden concentrated on aircraft operators to perform inspections and remedial work"],"plain_english_summary":"Mandates inspection of the upper-deck floor beam at station 980 on Boeing 747-300/-400 and stretched upper-deck 747s where an upper-deck cart lift is installed (Applicability). It requires operators to follow the technical instructions of FAA AD 97‑09‑13 (Requirement) and becomes effective 14 August 1997 (Compliance).\n\nThe FAA reported extensive corrosion and risk of fatigue cracking that could break the beam and cause rapid decompression (Background). Aircraft operators pay for and must carry out the inspections and any corrective action per the referenced FAA AD and Boeing service bulletins."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-177-upper-deck-floor-beam-at-sta-980","history":"/api/acts/ad-b747-177-upper-deck-floor-beam-at-sta-980/history","analysis":"/api/acts/ad-b747-177-upper-deck-floor-beam-at-sta-980/analysis","conflicts":"/api/acts/ad-b747-177-upper-deck-floor-beam-at-sta-980/conflicts","importantCases":"/api/acts/ad-b747-177-upper-deck-floor-beam-at-sta-980/important-cases","documents":"/api/acts/ad-b747-177-upper-deck-floor-beam-at-sta-980/documents"}}