{"id":"F2006B03293","name":"AD/B767/111 - MLG Forward Trunnion Joint","slug":"ad-b767-111-mlg-forward-trunnion-joint","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42730,"registerId":"commonwealth-F2006B03293-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B767/111 - MLG 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/B767/111 MLG Forward Trunnion Joint 8/99\n\nApplicability: Model 767 series aircraft, with line positions 001 through 455.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 99-10-08 Amdt 39- 11161.\n\nNote: Boeing Service Bulletin 767-32A0127 refers.\n\nCompliance: As specified in the Requirement Document for the initial, and if applicable, repeat inspections; with a revised effective date of 12 August 1999.\n\nThis Airworthiness Directive becomes effective on 12 August 1999.\n\nBackground: The FAA received reports of corrosion at the forward trunnion thrust face, tabs, and the internal threads of the forward trunnion of the main landing gear due to moisture in the forward trunnion joint. Corrosion of the forward trunnion joint could lead to a stress corrosion fracture of the forward trunnion and possible consequent collapse of the landing gear.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive addressing a specific safety defect in specific aircraft. It has not expanded beyond its original purpose of addressing corrosion in the main landing gear forward trunnion joint of early Boeing 767 aircraft."},"complexity_factors":["Very short document (approximately 150 words)","Only 1 defined term implicitly referenced (line positions)","Single cross-reference to FAA AD 99-10-08 and Boeing Service Bulletin 767-32A0127","No nested conditional logic or exceptions","Straightforward applicability criteria (specific aircraft serial numbers)","Single compliance requirement with clear deadline"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific Boeing 767 aircraft.\n\n**What it does:** It requires owners and operators of certain Boeing 767 planes (those built in the first 455 production units, known as \"line positions 001 through 455\") to inspect and fix a dangerous corrosion problem in the main landing gear.\n\n**The problem:** Moisture was getting into the \"forward trunnion joint\" — a critical structural connection point where the main landing gear attaches to the aircraft. This moisture was causing corrosion (rust-like damage) on the thrust face, tabs, and internal threads. If left unchecked, this corrosion could cause the metal to crack and fail, potentially leading to the landing gear collapsing during takeoff or landing.\n\n**What must be done:** Aircraft operators must follow the technical instructions in an American safety order (FAA AD 99-10-08) and a Boeing service bulletin (767-32A0127). This involves inspections at specific intervals to check for corrosion, with the first inspection required by 12 August 1999.\n\n**Who it affects:** Airlines and operators flying early-production Boeing 767 aircraft in Australia.\n\n**Why it matters:** Landing gear failure is catastrophic. This directive prevents potential accidents by catching corrosion before it causes structural failure."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument applies to Model 767 aircraft with line positions 001–455 and requires compliance with the technical measures set out in FAA AD 99-10-08 and the related Boeing service bulletin. The text supplied does not indicate any expansion or narrowing of that applicability beyond these elements or any amendment that changes the underlying scope of affected aircraft or actions; it records a revised effective date (12 August 1999) and sets inspection and repeat inspection requirements as specified in the referenced documents. (Applicability; Requirement; Compliance)"},"complexity_factors":["Reference to an external FAA AD (99-10-08 Amdt 39-11161) and a Boeing service bulletin (dependency on external technical documents) (Requirement; Note)","Limited and specific applicability to Model 767 aircraft line positions 001–455 (Applicability)","Requirement for initial and potential repeat inspections with a specified effective date (Compliance)","Operational impacts: scheduling inspections, possible follow-on repairs, aircraft downtime (Compliance)","Low legal discretion — the AD mandates compliance rather than setting standards that require significant interpretation (Requirement)"],"plain_english_summary":"This instrument mandates that operators of Boeing 767 aircraft (line positions 001–455) conduct the FAA‑specified inspections and any corrective actions for the main landing gear forward trunnion joint, as set out in FAA AD 99‑10‑08 and Boeing Service Bulletin 767‑32A0127. It responds to reported corrosion that could cause trunnion fracture and gear collapse; operators must follow the referenced procedures exactly and bear the inspection, repair and downtime costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-111-mlg-forward-trunnion-joint","history":"/api/acts/ad-b767-111-mlg-forward-trunnion-joint/history","analysis":"/api/acts/ad-b767-111-mlg-forward-trunnion-joint/analysis","conflicts":"/api/acts/ad-b767-111-mlg-forward-trunnion-joint/conflicts","importantCases":"/api/acts/ad-b767-111-mlg-forward-trunnion-joint/important-cases","documents":"/api/acts/ad-b767-111-mlg-forward-trunnion-joint/documents"}}