{"id":"F2006B03303","name":"AD/B767/121 - Strut Side Load Underwing Fitting Bolts","slug":"ad-b767-121-strut-side-load-underwing-fitting-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42740,"registerId":"commonwealth-F2006B03303-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.","sortOrder":0},{"sectionNumber":"AD/B767/121 Strut Side Load Underwing Fi","sectionType":"part","heading":"AD/B767/121 Strut Side Load Underwing Fitting Bolts 7/2000","content":"# AD/B767/121 Strut Side Load Underwing Fitting Bolts 7/2000\n\nTX\n\nApplicability: Model 767 series aircraft, line numbers 1 through 230 inclusive.\n\nRequirement: 1. Perform a one-time inspection of the tension bolts in the side load underwing fittings on both struts to determine whether tension bolts made of H-11 steel are installed, in accordance with Boeing Alert Service Bulletin (ASB) 767-57A0074, dated 17 May 2000, or Revision 1, dated 18 May 2000.\n\nIf the inspection shows conclusively that no H-11 steel bolt is installed, no further action is required by this Directive.\n\n2. If any H-11 steel bolt is found during the Requirement 1 inspection, or if the type of bolt cannot be determined, before further flight, perform an ultrasonic inspection to detect cracking or fracturing of the tension bolts in the side load underwing fittings on both struts, in accordance with Boeing ASB 767-57A0074 or ASB 767-57A0074 Revision 1.\n\nIf any cracked or fractured bolt is found during any Requirement 2 inspection, before further flight, replace both tension bolts in the affected side load underwing fitting with new, improved bolts in accordance with Boeing ASB 767-57A0074 or ASB 767-57A0074 Revision 1.\n\nIf both tension bolts in one side load underwing fitting are found cracked or fractured during any Requirement 2 inspection, before further flight, perform inspections to detect discrepancies of adjacent structure in accordance with a method acceptable to the Authority.\n\nNote 1: Replacement of all H-11 steel tension bolts in the side load underwing fittings on both struts with new, improved bolts, in accordance with Boeing ASB 767- 57A0074, or Boeing ASB 767-57A0074 Revision 1, constitutes terminating action for this Directive.\n\nNote 2: FAA Emergency AD 2000-10 \\-51 refers.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The Directive explicitly applies to Model 767 series aircraft, line numbers 1–230. The text does not amend or expand that applicability; no change of scope from the stated applicability is made within the document."},"complexity_factors":["Technical inspection methods required (ultrasonic testing) — requires specialised equipment and trained personnel (Requirement 2).","Conditional workflow: initial identification of bolt alloy (Requirement 1) determines whether further ultrasonic inspection or replacement is needed (Requirement 2).","Immediate safety-critical timing: actions and replacements must be completed 'before further flight', increasing operational disruption and scheduling pressure (Requirement 2).","Multiple compliance paths referenced: Boeing ASB 767-57A0074 or Revision 1, and FAA Emergency AD noted — operators must follow external service instructions and track revisions (Requirement 1, Note 2).","Terminating action exists (replacement of all H‑11 bolts per Boeing ASB) which changes future compliance obligations if taken (Note 1).","Discretion for post‑failure structural inspections: if both bolts in a fitting are cracked, inspections of adjacent structure must follow a method 'acceptable to the Authority', creating regulatory discretion (Requirement 2).","Narrow applicability (Model 767 line numbers 1–230) focuses burden on a defined operator subset but requires fleet checks for those aircraft (Applicability)."],"plain_english_summary":"This AD requires operators of Boeing 767 aircraft (line numbers 1–230) to perform a one‑time check of the side‑load underwing fitting tension bolts to see if H‑11 steel bolts are installed; if any are found or the type is unknown, ultrasonic inspections for cracking are required and cracked bolts must be replaced before further flight. Replacing all H‑11 bolts per Boeing service instructions ends the directive. The Authority states the action corrects an unsafe condition; operators pay inspection, testing and replacement costs and must schedule aircraft downtime to comply."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, targeted airworthiness directive focused on a specific mechanical defect in a defined aircraft population. The scope remains precisely limited to the H-11 bolt inspection and replacement issue as originally intended."},"complexity_factors":["Short, single-purpose directive (2 main requirements with sub-conditions)","Only 4 defined/document references (Boeing ASB 767-57A0074 and Revision 1, FAA Emergency AD 2000-10-51)","Clear conditional logic (if/then structure) but nested 2 levels deep","Specific technical terminology requires aviation engineering knowledge to fully implement (H-11 steel, ultrasonic inspection, side load underwing fittings)","Limited cross-referencing — primarily refers to Boeing service bulletins for detailed procedures"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of early Boeing 767s (line numbers 1–230) to verify and, where necessary, ultrasonic-inspect and replace potentially crack-prone H‑11 steel side-load underwing fitting bolts. Cracked bolts must be replaced and adjacent structure checked; replacing all H‑11 bolts with improved parts terminates the requirement. It’s a preventive safety order to remove a structural failure risk that could compromise wing support."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-121-strut-side-load-underwing-fitting-bolts","history":"/api/acts/ad-b767-121-strut-side-load-underwing-fitting-bolts/history","analysis":"/api/acts/ad-b767-121-strut-side-load-underwing-fitting-bolts/analysis","conflicts":"/api/acts/ad-b767-121-strut-side-load-underwing-fitting-bolts/conflicts","importantCases":"/api/acts/ad-b767-121-strut-side-load-underwing-fitting-bolts/important-cases","documents":"/api/acts/ad-b767-121-strut-side-load-underwing-fitting-bolts/documents"}}