{"id":"F2006B03451","name":"AD/B767/98 - Main Gear Forward Trunnion Joint","slug":"ad-b767-98-main-gear-forward-trunnion-joint","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43005,"registerId":"commonwealth-F2006B03451-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B767/98 - Main Gear Forward Trunnion Joint","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 767 Series Aeroplanes\n\nAD/B767/98 Main Gear Forward Trunnion Joint 12/97\n\nApplicability: Model 767 series aircraft, line positions 1 through 600 inclusive, except line positions 579 and 586.\n\nRequirement: Inspect the main landing gear retaining bolt in accordance with Boeing Alert Service Bulletin 767-32A0157.\n\nNote: FAA AD 97-16-03 Amdt 39-10093 refers.\n\nCompliance: Unless already accomplished, within 500 flight hours or 300 flight cycles after 6 November 1997, whichever occurs later.\n\nThis airworthiness directive becomes effective on 6 November 1997.\n\nBackground: The FAA received a report indicating that a disconnected retaining bolt was found in the main landing gear forward trunnion joint of a Model 767 series aircraft. The actions specified by this Directive are intended to prevent aft-acting trunnion loads from being transferred to the main gear beam, and consequent fracture and collapse of the main landing gear.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Based on the text provided, the Directive’s scope matches its stated purpose: it targets specified Model 767 line positions (1–600, excluding 579 and 586) and mandates an inspection of the main landing gear forward trunnion retaining bolt to prevent transfer of aft-acting trunnion loads to the main gear beam. The text does not indicate any expansion or narrowing of scope beyond that original aim."},"complexity_factors":["Narrow technical scope (single component: main gear forward trunnion retaining bolt)","Single mandated action (inspect per a named Boeing Alert Service Bulletin)","Clear compliance window (500 flight hours or 300 flight cycles after a specified effective date)","Specific applicability limited by airframe series and explicit excluded line positions (adds minor targeting nuance)","Dependence on an external document (Boeing Alert Service Bulletin) for procedural detail","Cross-reference to an FAA AD (jurisdictional/standards cross-link adds minor interpretive step)","Regulatory authority and effective date explicitly stated (reduces legal ambiguity)"],"plain_english_summary":"This directive mandates a one‑time inspection of the main landing‑gear retaining bolt on specified Boeing 767s (line positions 1–600, except 579 and 586), to be done per Boeing Alert Service Bulletin 767‑32A0157 within 500 flight hours or 300 cycles after 6 Nov 1997. It responds to a report of a disconnected retaining bolt that could lead to gear fracture and collapse; affected operators/maintenance organisations must fund and carry out the inspection and any corrective work."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete airworthiness directive with a single, focused purpose: inspecting a specific mechanical component on a specific aircraft model. It has not expanded beyond its original safety intent."},"complexity_factors":["Single, specific mechanical component targeted (one bolt in one joint)","Clear applicability criteria (specific line positions with two explicit exceptions)","Single requirement: inspect per referenced Boeing document","Simple compliance deadline (500 hours OR 300 cycles, whichever is later)","No nested definitions, cross-references to other legislation, or conditional exceptions","Background explanation provided in plain language","Total length: approximately 150 words"],"plain_english_summary":"This is a **safety order for Boeing 767 aircraft**.\n\n**What it does:**\nIt requires airlines and aircraft operators to inspect a specific bolt in the main landing gear (the \"forward trunnion joint\") on certain Boeing 767 planes. The bolt keeps the landing gear properly attached to the aircraft structure.\n\n**Why it matters:**\nThe US aviation safety authority (FAA) found a case where this bolt had come loose. If the bolt fails, the landing gear could collapse during landing — a potentially catastrophic failure. This directive prevents that by catching the problem before it causes an accident.\n\n**Who it affects:**\n- **Aircraft affected:** Boeing 767 planes with serial numbers (\"line positions\") 1 through 600, except planes number 579 and 586\n- **People affected:** Airlines, maintenance crews, and operators of these specific aircraft\n\n**What must be done:**\nOperators must inspect the bolt following Boeing's specific technical instructions (Service Bulletin 767-32A0157). This must be done within 500 flight hours or 300 takeoff-landing cycles after 6 November 1997 — whichever happens later.\n\n**Key point:** This is a mandatory safety fix. \"Compliance\" means it must be done — there's no option to skip it."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-98-main-gear-forward-trunnion-joint","history":"/api/acts/ad-b767-98-main-gear-forward-trunnion-joint/history","analysis":"/api/acts/ad-b767-98-main-gear-forward-trunnion-joint/analysis","conflicts":"/api/acts/ad-b767-98-main-gear-forward-trunnion-joint/conflicts","importantCases":"/api/acts/ad-b767-98-main-gear-forward-trunnion-joint/important-cases","documents":"/api/acts/ad-b767-98-main-gear-forward-trunnion-joint/documents"}}