{"id":"F2006L02227","name":"AD/CONVAIR/25 - Main Landing Gear Piston and Axle Assembly","slug":"ad-convair-25-main-landing-gear-piston-and-axle-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":117554,"registerId":"commonwealth-F2006L02227-current","compilationNumber":null,"startDate":"2026-04-03","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/25 | Main Landing Gear Pistonand Axle Assembly | 8/2006 |\n| ------------- | ----------------------------------------- | ------ |\n\n| Applicability: | Convair Models 340 and 440 Series Aircraft.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | To prevent the loss of a main landing gear piston and axle assembly due to an improperly installed gland nut, inspect the main landing gear nut installation to assure that the gland nut is installed as follows:1. Screw the gland nut, P/N 528062, onto the main landing gear outer cylinder, P/N 528402, until it is tight.2. Unscrew the gland nut until the first tapped hole is opposite one of the milled slots in the cylinder.3. Screw lock screw, P/N AN 501A-416-8, into the tapped hole so that the screw protrudes into the milled slot in the cylinder.4. Screw set screw, P/N 500305-4, into an adjacent tapped hole in the gland nut and safety the lock screw and set screw with a lockwire.(General Dynamics/Convair Models 340 and 440 Maintenance Manuals cover this same subject.)Note: FAA AD 65-12-01 Amdt. 39-75refers. |\n| Compliance:    | At each time the main landing gear gland nut is reinstalled after the effective date of this AD.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n|                | This Airworthiness Directive becomes effective on 3 August 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n| Background:    | The requirements of this AD are intended to prevent the loss of a main landing gear piston and axle assembly due to an improperly installed gland nut.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n21 June 2006","sortOrder":0},{"sectionNumber":"AD/CONVAIR/25","sectionType":"part","heading":"AD/CONVAIR/25","content":"## AD/CONVAIR/25","sortOrder":1},{"sectionNumber":"Main Landing Gear Pistonand Axle Assembl","sectionType":"part","heading":"Main Landing Gear Pistonand Axle Assembly","content":"## Main Landing Gear Piston  \nand Axle Assembly","sortOrder":2},{"sectionNumber":"8/2006","sectionType":"part","heading":"8/2006","content":"## 8/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive sticks to its stated safety objective—preventing loss of the piston and axle—by mandating a specific installation and inspection procedure for main landing gear gland nuts on Convair 340/440 aircraft. It does not broaden applicability beyond those models or introduce additional regulatory powers; it instead imposes a recurring operational requirement (each gland-nut reinstallation) and specified parts/technique for maintainers."},"complexity_factors":["Narrow applicability: only Convair Models 340 and 440 (reduces scope and stakeholder variety).","Procedural specificity: prescribes a concrete installation/locking method with part numbers (reduces interpretive ambiguity).","Recurring compliance trigger: applies every time the gland nut is reinstalled (creates ongoing labour demand).","Parts and materials requirement: named parts and lockwire create procurement and inventory tasks for operators.","Low regulatory discretion: the AD states a clear mechanical outcome rather than flexible performance standards.","Reference to external guidance: cites manufacturer maintenance manuals and an FAA AD (adds cross-referencing but not legal complexity)."],"plain_english_summary":"This Airworthiness Directive requires that when the main landing gear gland nut is reinstalled on Convair Models 340 and 440, maintainers must inspect and fit it using a specified locking arrangement to keep the piston and axle assembly from coming off. It targets operators and maintenance organisations for those aircraft and matters because it changes routine maintenance steps, imposes a recurring compliance check, and requires specific parts and safety wiring each time the gland nut is refitted."},"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":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive targeting a specific mechanical defect in specific aircraft. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single, specific mechanical procedure with only 4 sequential steps","No defined terms section or interpretation provisions","No cross-references to other legislation (only references a maintenance manual and FAA AD for background)","Clear, unambiguous applicability limited to two specific aircraft models","Single compliance trigger (reinstallation of gland nut)","No exceptions, exemptions, or conditional logic"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection and a specific securing procedure for the main landing gear gland nut on Convair 340/440 aircraft to prevent incorrect installation that could let a wheel assembly detach.  \n\nIt affects owners, operators and maintenance engineers of these vintage aircraft in Australia and matters because it prevents a known failure mode that could cause runway accidents, injuries and significant damage."}},"importantCases":[],"_links":{"self":"/api/acts/ad-convair-25-main-landing-gear-piston-and-axle-assembly","history":"/api/acts/ad-convair-25-main-landing-gear-piston-and-axle-assembly/history","analysis":"/api/acts/ad-convair-25-main-landing-gear-piston-and-axle-assembly/analysis","conflicts":"/api/acts/ad-convair-25-main-landing-gear-piston-and-axle-assembly/conflicts","importantCases":"/api/acts/ad-convair-25-main-landing-gear-piston-and-axle-assembly/important-cases","documents":"/api/acts/ad-convair-25-main-landing-gear-piston-and-axle-assembly/documents"}}