{"id":"F2008L01520","name":"AD/B747/376 - Wing Landing Gear Trunnion Fork Assembly","slug":"ad-b747-376-wing-landing-gear-trunnion-fork-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":119925,"registerId":"commonwealth-F2008L01520-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/B747/376 | Wing Landing Gear Trunnion Fork Assembly | 6/2008 |\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 Bulletin 747-32A2482 original issue, or later FAA approved revision.                                                   |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Action in accordance with the technical requirements of FAA AF 2008-09-05 Amdt 39-15486.                                                                                                                                                                                       |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of5 June 2008.                                                                                                                                                                                         |\n|                | This Airworthiness Directive becomes effective on 5 June 2008.                                                                                                                                                                                                                 |\n| Background:    | The FAA received a report of a fractured wing landing gear trunnion fork assembly. A fractured trunnion fork assembly could result in the collapse of a wing landing gear on the ground and possible damage to hydraulic equipment and the aileron and spoiler control cables. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n23 April 2008","sortOrder":0},{"sectionNumber":"AD/B747/376","sectionType":"part","heading":"AD/B747/376","content":"## AD/B747/376","sortOrder":1},{"sectionNumber":"Wing Landing Gear Trunnion Fork Assembly","sectionType":"part","heading":"Wing Landing Gear Trunnion Fork Assembly","content":"## Wing Landing Gear Trunnion Fork Assembly","sortOrder":2},{"sectionNumber":"6/2008","sectionType":"part","heading":"6/2008","content":"## 6/2008","sortOrder":3}],"analysis":{"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 exactly one mechanical defect in one aircraft type family. There is no evidence of scope creep; it remains tightly focused on the trunnion fork assembly issue as originally identified."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly referenced (the Boeing Service Bulletin)","No nested conditional logic — simple 'do this by this date' structure","Single cross-reference to external FAA document rather than internal legislative complexity","No exceptions, exemptions, or alternative compliance paths mentioned","Straightforward applicability table — aircraft models listed explicitly"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspections/repairs on most Boeing 747 models to address a cracked wing landing gear trunnion fork assembly reported by the FAA. The defect could cause wing landing gear collapse on ground, damaging hydraulic and flight‑control systems. Australian operators (and foreign 747s under CASA jurisdiction) must follow FAA AD 2008‑09‑05 (as amended) by 5 June 2008."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument adopts the FAA AD and the referenced Boeing Alert Service Bulletin for the listed 747 models without expanding affected models or adding new measures beyond those documents; it sets an effective date of 5 June 2008 and requires compliance as specified (Requirement; Applicability; Compliance)."},"complexity_factors":["Direct adoption of an external FAA AD and Boeing service bulletin creates a foreign-reference dependency (Requirement; Applicability).","Safety-critical mechanical inspection and possible repair require qualified maintenance personnel and technical procedures (Background; Requirement).","Applies to multiple 747 variants, increasing the number of affected operators but not varying obligations by subtype (Applicability).","Clear effective date and mandatory compliance reduce regulatory discretion but create scheduling and aircraft-downtime pressures (Compliance).","Potential cost and parts-availability impacts fall on aircraft owners/operators (Compliance)."],"plain_english_summary":"This directive requires operators of the listed Boeing 747 models to carry out the inspections and corrective actions set out in FAA Airworthiness Directive AF 2008‑09‑05 and Boeing Alert Service Bulletin 747‑32A2482 to address a reported fracture of the wing landing‑gear trunnion fork assembly that could cause gear collapse (Applicability; Requirement; Background). It imposes costs on aircraft owners/operators who must complete and document the work, and is enforced by CASA with an effective date of 5 June 2008 (Compliance)."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-376-wing-landing-gear-trunnion-fork-assembly","history":"/api/acts/ad-b747-376-wing-landing-gear-trunnion-fork-assembly/history","analysis":"/api/acts/ad-b747-376-wing-landing-gear-trunnion-fork-assembly/analysis","conflicts":"/api/acts/ad-b747-376-wing-landing-gear-trunnion-fork-assembly/conflicts","importantCases":"/api/acts/ad-b747-376-wing-landing-gear-trunnion-fork-assembly/important-cases","documents":"/api/acts/ad-b747-376-wing-landing-gear-trunnion-fork-assembly/documents"}}