{"id":"F2006L02205","name":"AD/B747/348 - Outboard Strut Spring Beam Midpivot Bolt and Midpivot Bolt Access Door","slug":"ad-b747-348-outboard-strut-spring-beam-midpivot-bolt-and-midpivot-bolt-access-door","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":117533,"registerId":"commonwealth-F2006L02205-current","compilationNumber":null,"startDate":"2026-04-03","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/B747/348 | Outboard Strut Spring Beam MidpivotBolt and Midpivot Bolt Access Door | 8/2006 |\n| ----------- | --------------------------------------------------------------------- | ------ |\n\n| Applicability: | Model 747-100B, -200B, -200F, -300, -400, -400F, and 747SP series aircraft; as identified in Boeing Alert Service Bulletin 747-54A2225 original issue, or later FAA approved revision.                                                                                                                                                                                                                                                            |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2006-12-03 Amdt 39-14627.                                                                                                                                                                                                                                                                                                                                                          |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of3 August 2006.                                                                                                                                                                                                                                                                                                                                                          |\n|                | This Airworthiness Directive becomes effective on 3 August 2006.                                                                                                                                                                                                                                                                                                                                                                                  |\n| Background:    | The FAA received reports indicating that the midpivot bolt and midpivot bolt access door of the spring beam of the inboard side of the outboard struts were installed in the incorrect position. If not installed in the correct position, a midpivot bolt could be overloaded and crack or fracture, which could result in loss of the spring load path and consequent separation of the associated outboard strut and engine from the aircraft. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n21 June 2006","sortOrder":0},{"sectionNumber":"AD/B747/348","sectionType":"part","heading":"AD/B747/348","content":"## AD/B747/348","sortOrder":1},{"sectionNumber":"Outboard Strut Spring Beam MidpivotBolt ","sectionType":"part","heading":"Outboard Strut Spring Beam MidpivotBolt and Midpivot Bolt Access Door","content":"## Outboard Strut Spring Beam Midpivot  \nBolt and Midpivot Bolt Access Door","sortOrder":2},{"sectionNumber":"8/2006","sectionType":"part","heading":"8/2006","content":"## 8/2006","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 safety purpose. It addresses a single identified mechanical defect on specific aircraft models. There is no indication of scope creep; the document precisely targets the reported installation error with no extraneous provisions."},"complexity_factors":["Very short document (approximately 200 words of substantive content)","Only 1 defined term implicitly referenced (the Boeing service bulletin)","No nested conditional logic or exceptions","Single cross-reference to an external FAA document (AD 2006-12-03) which contains the actual technical requirements","Straightforward applicability table with clear aircraft model listing","No internal definitions section or interpretation provisions"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of certain Boeing 747 series (‑100B, ‑200B/‑200F, ‑300, ‑400/‑400F, and 747SP) covered by Boeing Service Bulletin 747‑54A2225 to inspect and, if necessary, correct the installation of a bolt and access door on the spring beam of the outboard engine strut.  \n\nFollowing FAA AD 2006‑12‑03’s procedures prevents bolt cracking or failure that could lead to separation of the outboard strut and engine in flight."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"No: the directive adopts the FAA AD's technical requirements for the listed 747 models and points to Boeing's service bulletin for identification of affected aircraft. The instrument sets a revised effective date (3 August 2006) but does not expand the applicability or alter the substantive actions required (Applicability; Requirement; Compliance)."},"complexity_factors":["Cross-reference to an external FAA airworthiness directive (FAA AD 2006-12-03) creating a dependence on another instrument for technical detail (Requirement).","Reliance on a manufacturer service bulletin (Boeing Alert Service Bulletin 747-54A2225) to identify affected serials and procedures (Applicability).","Safety-critical mechanical inspection and corrective work (potential for bolt overload/fracture) increases compliance risk and need for qualified maintenance resources (Background).","Multiple 747 variants listed increases the number of affected operators and fleet heterogeneity (Applicability).","Revised effective date and explicit compliance timing impose operational scheduling and documentation burdens on operators (Compliance).","Delegated execution to maintenance organisations/operators creates administrative and verification responsibilities for regulators and operators (Requirement; Compliance)."],"plain_english_summary":"**What it does:** Requires operators of certain Boeing 747 models to follow the technical steps of FAA AD 2006-12-03 (and Boeing Alert Service Bulletin 747-54A2225) to inspect and, if needed, correct the outboard strut spring beam midpivot bolt and its access door after reports of incorrect installation that can overload and fracture the bolt. Effective 3 August 2006. Affects aircraft operators and maintenance organisations who must carry out the specified work."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-348-outboard-strut-spring-beam-midpivot-bolt-and-midpivot-bolt-access-door","history":"/api/acts/ad-b747-348-outboard-strut-spring-beam-midpivot-bolt-and-midpivot-bolt-access-door/history","analysis":"/api/acts/ad-b747-348-outboard-strut-spring-beam-midpivot-bolt-and-midpivot-bolt-access-door/analysis","conflicts":"/api/acts/ad-b747-348-outboard-strut-spring-beam-midpivot-bolt-and-midpivot-bolt-access-door/conflicts","importantCases":"/api/acts/ad-b747-348-outboard-strut-spring-beam-midpivot-bolt-and-midpivot-bolt-access-door/important-cases","documents":"/api/acts/ad-b747-348-outboard-strut-spring-beam-midpivot-bolt-and-midpivot-bolt-access-door/documents"}}