{"id":"F2006B11168","name":"AD/LJ45/7 - Main Landing Gear Trunnion Shear Pins","slug":"ad-lj45-7-main-landing-gear-trunnion-shear-pins","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56865,"registerId":"commonwealth-F2006B11168-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\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 CASR 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.\n\n![](image.001.png)  \n\nLearjet 45 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/LJ45/7 Main Landing Gear Trunnion She","sectionType":"part","heading":"AD/LJ45/7 Main Landing Gear Trunnion Shear Pins 11/2003","content":"# AD/LJ45/7 Main Landing Gear Trunnion Shear Pins 11/2003\n\nDM\n\nApplicability: Model 45 aircraft, serial numbers 45-005 through 45-208, 45-210 through 45-222, 45-\n\n224, 45-225, 45-227, and 45-229 through 45-231.\n\nRequirement: 1. Revise the airworthiness limitations (AWL) section of the Instructions for Continued Airworthiness by inserting the instructions for Inspection Reference Numbers (IRN) J3220041, J3220042, and J3220043 (shear pins); as specified on page 2 of Chapter 4-11-00, Revision 32, dated 13 June 2003, of the Learjet 45 Maintenance Manual; into the AWL section. Thereafter, unless FAA approved, no alternative replacement interval may be approved for the shear pins in the trunnion assemblies of the main landing gears.\n\n2. Replace the shear pins, having part number 4532103015-001V1088, 4532103015-003, 4532103025-001V1088, or 4532103026-001V1088, located in the trunnion assemblies of the main landing gears with new, improved shear pins (including re-identifying the trunnion assemblies); in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 45-57-6, dated 9 June 2003.\n\nNote: FAA AD 2003-16-09 Amdt 39-13262 refers.\n\nCompliance: 1. Within 14 days after 3 September 2003.\n\n2. Before the accumulation of 1,800 total landings on the shear pins, or within 100 landings after 3 September 2003, whichever occurs later.\n\nThis Airworthiness Directive becomes effective on 3 September 2003.","sortOrder":1}],"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":3,"scope_assessment":{"changed":false,"description":"This is a standard, targeted airworthiness directive addressing a specific unsafe condition in specific aircraft. It has not expanded beyond its original safety purpose."},"complexity_factors":["Specific part numbers and serial number ranges create precise applicability","Two distinct compliance deadlines with a 'whichever occurs later' conditional","Cross-reference to US FAA AD 2003-16-09 and Bombardier Service Bulletin 45-57-6","Reference to specific manual revision (Chapter 4-11-00, Revision 32, dated 13 June 2003)","Prohibition on alternative replacement intervals without FAA approval"],"plain_english_summary":"This AD orders owners/operators of specified Learjet 45 serials to update maintenance manuals and replace old main landing gear shear pins with improved versions to prevent potential gear failure. It affects aircraft within the listed serial range and matters because existing pins are unsafe. Manual updates are required within 14 days; pin replacement by 1,800 landings or within 100 landings after the effective date, whichever is later. Alternative replacement intervals are not permitted without FAA approval."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD confines its effect to the specific Model 45 serial numbers and the specified shear-pin part numbers and imposes two required actions (AWL insertion and pin replacement) with set deadlines. It does not expand applicability beyond the listed aircraft or require actions other than those stated (see Applicability; Requirement 1–2; Compliance 1–2)."},"complexity_factors":["Narrow applicability: applies only to listed Model 45 serial numbers (Applicability).","Dual-action requirement: administrative change to the AWL plus a physical parts replacement (Requirement 1 and 2).","Technical specificity: identifies exact shear-pin part numbers to be replaced (Requirement 2).","Mandatory reference to manufacturer instructions: replacement must follow Bombardier Service Bulletin 45-57-6 (Requirement 2).","Fixed compliance deadlines: short administrative deadline (within 14 days) and an operational threshold (before 1,800 total landings or within 100 landings) (Compliance 1–2).","Restriction on alternatives: no alternative replacement interval may be approved unless FAA approved, constraining operator flexibility (Requirement 1).","Traceability/re-identification duty: requires re-identifying trunnion assemblies when fitting new pins, adding record-keeping/workshop work (Requirement 2).","Operational impact: potential parts logistics, maintenance scheduling and aircraft downtime obligations for owners/operators (inferred from Replacement and Compliance timing).","Cross-reference to foreign AD: links to FAA AD 2003-16-09 (Note), implying coordination with FAA approvals."],"plain_english_summary":"This Airworthiness Directive orders operators of specified Learjet 45 serial numbers to (1) add mandated inspections for main landing gear trunnion shear pins into their Instructions for Continued Airworthiness, and (2) replace specified shear-pin part numbers with improved pins (including re-identifying trunnion assemblies) following Bombardier service instructions. It sets fixed compliance windows and bars alternative replacement intervals unless the FAA approves them. Owners, operators and maintenance organisations must schedule the inspections/replacements and pay for parts, labour and any downtime."}},"importantCases":[],"_links":{"self":"/api/acts/ad-lj45-7-main-landing-gear-trunnion-shear-pins","history":"/api/acts/ad-lj45-7-main-landing-gear-trunnion-shear-pins/history","analysis":"/api/acts/ad-lj45-7-main-landing-gear-trunnion-shear-pins/analysis","conflicts":"/api/acts/ad-lj45-7-main-landing-gear-trunnion-shear-pins/conflicts","importantCases":"/api/acts/ad-lj45-7-main-landing-gear-trunnion-shear-pins/important-cases","documents":"/api/acts/ad-lj45-7-main-landing-gear-trunnion-shear-pins/documents"}}