{"id":"F2006L03203","name":"AD/CONVAIR/26 - Main Landing Gear Lockpins","slug":"ad-convair-26-main-landing-gear-lockpins","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":60518,"registerId":"commonwealth-F2006L03203-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Kelowna Flightcraft (General Dynamics/Co","sectionType":"division","heading":"Kelowna Flightcraft (General Dynamics/Convair) Series Aeroplanes","content":"### Kelowna Flightcraft (General Dynamics/Convair) Series Aeroplanes\n\n| AD/CONVAIR/26 | Main Landing Gear Lockpins | 11/2006 |\n| ------------- | -------------------------- | ------- |\n\n| Applicability: | Models 340 and 440 aeroplanes.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | To prevent failure of lockpins retaining the piston upper bearing and possible subsequent loss of the piston assembly from the main landing gear, accomplish the following:1. Inspect the piston upper bearing retaining lockpin(s).2. If loose or damaged lockpin(s) are discovered, replace lockpins(s).Note: FAA AD 71-21-04 Amdt 39-1308 refers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n| Compliance:    | 1. Within the next 300 hours time in service from the effective date of this AD, unless already accomplished within the last 1200 hours time in service, and at intervals not to exceed 1500 hours time in service thereafter, on those main landing gears known to have a single lockpin configuration or unknown lockpin configuration.Within 1000 hours time in service from the effective date of this AD, unless already accomplished within the last 2000 hours time in service, and thereafter at intervals not to exceed 3000 hours time in service, inspect the piston upper bearing retaining lockpins on those main landing gears known to have more than a single lockpin configuration.2. Before further flight after the effective date of this AD.The repetitive inspection intervals in Requirements 1 and 2 may be extended to 8000 hours when rework has been accomplished per Paragraph 2B, General Dynamics/Convair Service Bulletin No. 32-5, dated 3 September 1971, or later FAA approved revision. |\n|                | This Airworthiness Directive becomes effective on 26 October 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |\n\n| Background: | The requirements of this AD are intended to prevent failure of the lockpins and subsequent release of the piston assembly from the main landing gear. |\n| ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n13 September 2006","sortOrder":0},{"sectionNumber":"AD/CONVAIR/26","sectionType":"part","heading":"AD/CONVAIR/26","content":"## AD/CONVAIR/26","sortOrder":1},{"sectionNumber":"Main Landing Gear Lockpins","sectionType":"part","heading":"Main Landing Gear Lockpins","content":"## Main Landing Gear Lockpins","sortOrder":2},{"sectionNumber":"11/2006","sectionType":"part","heading":"11/2006","content":"## 11/2006","sortOrder":3}],"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD’s scope aligns with its stated purpose: prevent lockpin failure and subsequent release of the piston assembly. It applies only to Convair models 340 and 440 and accomplishes that aim by mandating inspections, repairs, and optional rework with extended intervals (Applicability; Requirement; Compliance). No indication in the text that the AD’s substantive scope departs from that original intent."},"complexity_factors":["Multiple time‑based inspection schedules that differ by known lockpin configuration (single/unknown vs multiple) and prior compliance history (Compliance).","Immediate before‑flight replacement requirement when defects are found, creating operational downtime risk (Requirement; Compliance).","Optional extension of repetitive intervals to 8000 hours only if rework is performed per General Dynamics/Convair Service Bulletin No. 32‑5, requiring coordination with/acceptance of that rework (Compliance).","Cross‑references to FAA AD 71‑21‑04 and the manufacturer service bulletin introduce external documents that operators must consult (Requirement; Compliance).","Applicability limited to specific aircraft types (Models 340 and 440), requiring operators to identify affected fleets (Applicability)."],"plain_english_summary":"This AD requires operators of Convair models 340 and 440 to inspect the main landing‑gear piston upper‑bearing retaining lockpins and to replace any loose or damaged lockpins to prevent loss of the piston assembly (Applicability; Requirement). It sets mandatory inspection schedules, a before‑flight replacement duty for discovered defects, and an option to extend intervals after rework per the manufacturer service bulletin; operators pay for inspections/repairs and must meet the AD’s Compliance timings (Compliance)."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific mechanical defect in specific aircraft models. It has not expanded beyond its original safety purpose of preventing landing gear lockpin failures."},"complexity_factors":["Multiple compliance timelines based on aircraft configuration (single vs multiple lockpins)","Cross-reference to US FAA AD 71-21-04 and General Dynamics/Convair Service Bulletin No. 32-5","Conditional logic for interval extensions (only applicable if specific rework performed)","Nested time calculations ('unless already accomplished within X hours') creating overlapping compliance windows","Technical aviation terminology requiring domain knowledge (piston upper bearing, time in service, lockpin configuration)"],"plain_english_summary":"This AD mandates scheduled inspections and immediate replacement of loose or damaged lockpins that secure the main landing gear piston upper bearing on certain Convair 340/440 aircraft. It affects operators of these vintage twin‑engine transports (cargo/charter) and aims to prevent piston assembly loss and potential gear collapse on takeoff or landing. Inspection intervals depend on pin configuration; an older approved repair can extend those intervals."}},"importantCases":[],"_links":{"self":"/api/acts/ad-convair-26-main-landing-gear-lockpins","history":"/api/acts/ad-convair-26-main-landing-gear-lockpins/history","analysis":"/api/acts/ad-convair-26-main-landing-gear-lockpins/analysis","conflicts":"/api/acts/ad-convair-26-main-landing-gear-lockpins/conflicts","importantCases":"/api/acts/ad-convair-26-main-landing-gear-lockpins/important-cases","documents":"/api/acts/ad-convair-26-main-landing-gear-lockpins/documents"}}