{"id":"F2006L01062","name":"AD/CONVAIR/20 - MLG Torque Arm Apex Bolt","slug":"ad-convair-20-mlg-torque-arm-apex-bolt","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":58368,"registerId":"commonwealth-F2006L01062-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/20 | MLG Torque Arm Apex Bolt | 5/2006 |\n| ------------- | ------------------------ | ------ |\n\n| Applicability: | Model 340 and 440 aircraft, and all such model aircraft converted to turbopropeller power; incorporating a Menasco main landing gear (MLG) torque arm apex bolt (Menasco part number 528076) that has a 0.67-inch fillet relief diameter.                                                                                                                                                                                                                              |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Inspect the MLG torque arm apex bolt for cracks by using a dye penetrant method.If cracking is detected during any inspection, replace with a serviceable original bolt or a redesigned bolt.The repetitive inspections required by this Directive may be terminated when a redesigned bolt is installed (Menasco part number 528076) that has a 0.79-inch fillet relief diameter, and a letter “R” stamped on one end.Note: FAA AD 63-11-02 Amdt 567 Part 507 refers. |\n| Compliance:    | Unless the initial inspection is already accomplished; within 250 hours time in service after 11 May 2006, unless accomplished within the last 300 hours time in service. Inspect thereafter at intervals not to exceed 550 hours time in service, until a redesigned bolt is installed.                                                                                                                                                                               |\n|                | This Airworthiness Directive becomes effective on 11 May 2006.                                                                                                                                                                                                                                                                                                                                                                                                         |\n| Background:    | Reports were received of MLG torque arm apex bolts cracking in the fillet relief diameter.                                                                                                                                                                                                                                                                                                                                                                             |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n31 March 2006","sortOrder":0},{"sectionNumber":"AD/CONVAIR/20","sectionType":"part","heading":"AD/CONVAIR/20","content":"## AD/CONVAIR/20","sortOrder":1},{"sectionNumber":"MLG Torque Arm Apex Bolt","sectionType":"part","heading":"MLG Torque Arm Apex Bolt","content":"## MLG Torque Arm Apex Bolt","sortOrder":2},{"sectionNumber":"5/2006","sectionType":"part","heading":"5/2006","content":"## 5/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive applies narrowly to the identified Convair models and to Menasco part 528076 bolts with a 0.67-inch fillet relief and mandates inspections/replacement until a specified redesigned bolt is fitted (Applicability; Requirement). There is no expansion to other models, parts, or unlisted bolt dimensions in the text, so the scope remains aligned with the stated safety concern (Background)."},"complexity_factors":["Targeted applicability by aircraft model and conversion status — Model 340 and 440 and turboprop conversions (Applicability).","Component-level identification by maker, part number and measured feature (Menasco part number 528076; 0.67-inch fillet relief) requiring physical verification (Applicability; Requirement).","Mandatory non-destructive inspection method specified (dye penetrant) which imposes technician skill, access and tooling needs (Requirement).","Repetitive inspection regime with explicit timing windows: initial within 250 hours TIS after 11 May 2006 unless inspected within the last 300 hours, then repeat every 550 hours until redesign is installed (Compliance).","Termination condition tied to installing a redesigned bolt defined by dimension and an \"R\" stamp — requires parts control and verification (Requirement).","Permitted corrective action allows replacement with either a serviceable original or redesigned bolt, creating inventory and sourcing decisions for operators (Requirement).","Effective date creates an immediate compliance horizon for scheduling inspections/maintenance (Compliance)."],"plain_english_summary":"This Airworthiness Directive requires aircraft owners/operators of Convair Model 340 and 440 aeroplanes (including turboprop conversions) fitted with a Menasco MLG torque arm apex bolt (part no. 528076) with a 0.67-inch fillet relief to inspect that bolt for cracks using dye-penetrant and to replace any cracked bolt. Repetitive inspections continue at set flight-hour intervals until a redesigned bolt (0.79-inch fillet relief, stamped \"R\") is fitted to terminate the inspections."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific mechanical failure mode in a defined aircraft fleet. The scope remains precisely limited to the identified defect (cracking in MLG torque arm apex bolts) and does not extend beyond the original safety purpose."},"complexity_factors":["Single, specific mechanical component addressed (one bolt type)","Clear applicability criteria using specific part numbers and measurements","Straightforward compliance timeline (initial inspection + recurring intervals)","Simple binary outcome (crack found = replace; no crack = re-inspect later)","Single termination condition (installation of redesigned part)","No nested definitions, cross-references to other legislation, or conditional exceptions","Only external reference is to a related FAA directive for context"],"plain_english_summary":"This AD requires owners/operators of Convair 340/440 (including turboprop conversions) that use a Menasco torque‑arm apex bolt with a 0.67\" fillet relief to perform dye‑penetrant inspections for cracks. If cracking is found the bolt must be replaced; inspections repeat every 550 flight hours until a redesigned 0.79\" fillet (R‑stamped) bolt is installed. The rule prevents landing‑gear collapse from bolt failure and applies to affected aircraft until the permanent replacement is fitted."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-convair-20-mlg-torque-arm-apex-bolt","history":"/api/acts/ad-convair-20-mlg-torque-arm-apex-bolt/history","analysis":"/api/acts/ad-convair-20-mlg-torque-arm-apex-bolt/analysis","conflicts":"/api/acts/ad-convair-20-mlg-torque-arm-apex-bolt/conflicts","importantCases":"/api/acts/ad-convair-20-mlg-torque-arm-apex-bolt/important-cases","documents":"/api/acts/ad-convair-20-mlg-torque-arm-apex-bolt/documents"}}