{"id":"F2006L03810","name":"AD/WHE/8 - MLG Wheel Assembly Part Numbers C20500000 and C20452000","slug":"ad-whe-8-mlg-wheel-assembly-part-numbers-c20500000-and-c20452000","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":137669,"registerId":"commonwealth-F2006L03810-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Wheels and Tyres","sectionType":"division","heading":"Wheels and Tyres","content":"### Wheels and Tyres\n\n| AD/WHE/8 | MLG Wheel Assembly Part NumbersC20500000 and C20452000 | 13/2006 |\n| -------- | ------------------------------------------------------ | ------- |\n\n| Applicability: | Messier-Goodrich S.A. or Goodrich-Messier Inc. Main Landing Gear (MLG) Wheel Assembly Part Numbers C20500000 and C20452000; known to be installed on, but not limited to, Airbus Model A321 series aircraft.                                                                                                                                                        |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Inspect the MLG wheel assembly in accordance with the instructions of Messier-Bugatti and Goodrich Service Bulletin (SB) C20452-32-3254 Revision 2, or later approved revision.If damage is found, before further flight, repair the MLG wheel assembly in accordance with SB C20452-32-3254 Revision 2, or later approved revision.Note: EASA AD 2006-0328 refers. |\n| Compliance:    | At each tyre change after 21 December 2006.                                                                                                                                                                                                                                                                                                                         |\n|                | This Airworthiness Directive becomes effective on 21 December 2006.                                                                                                                                                                                                                                                                                                 |\n| Background:    | Reports were received of wheel hub corrosion, mainly under the heat shield overlap area. In some cases a circular crack initiated from a corrosion pit. Cracks that initiate under the bead seat may not lead to pressure loss, but can result in flange separation, as experienced by some operators.                                                              |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n9 November 2006","sortOrder":0},{"sectionNumber":"AD/WHE/8","sectionType":"part","heading":"AD/WHE/8","content":"## AD/WHE/8","sortOrder":1},{"sectionNumber":"MLG Wheel Assembly Part NumbersC20500000","sectionType":"part","heading":"MLG Wheel Assembly Part NumbersC20500000 and C20452000","content":"## MLG Wheel Assembly Part Numbers  \nC20500000 and C20452000","sortOrder":2},{"sectionNumber":"13/2006","sectionType":"part","heading":"13/2006","content":"## 13/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive's scope remains focused on Messier‑Goodrich MLG wheel assemblies part numbers C20500000 and C20452000 and applies to known installations including Airbus A321; it establishes inspection and repair obligations per the manufacturer's Service Bulletin with compliance tied to tyre changes after 21 December 2006 (Applicability; Requirement; Compliance). There is no provision in the text widening the set of affected parts or adding obligations beyond inspection and repair per the SB."},"complexity_factors":["Requirement depends on manufacturer's Service Bulletin C20452-32-3254 Revision 2 (or later approved revision) rather than prescribing detailed inspection steps in the AD itself (Requirement) — creates dependence on external technical documentation and approvals.","Applicability is limited to specific MLG wheel assembly part numbers C20500000 and C20452000 but notes installation on, and not limited to, Airbus A321 series (Applicability) — narrow parts scope with potential cross‑fleet applicability.","Recurring timing: inspections are required 'at each tyre change after 21 December 2006' and the AD is effective from 21 December 2006 (Compliance) — imposes a continuing inspection obligation on operators.","Remedial obligation: any damage found must be repaired 'before further flight' in accordance with the SB (Requirement) — creates potential immediate operational impact (grounding/repairs).","Inspection difficulty: reported corrosion 'mainly under the heat shield overlap area' and cracks initiating 'under the bead seat' (Background) — some defects may be hard to detect, increasing inspection complexity and risk of missed defects.","Cross-reference to EASA AD 2006-0328 (Requirement/Note) — requires operators to align with related foreign authority guidance where relevant."],"plain_english_summary":"This Airworthiness Directive requires operators of Messier‑Goodrich (Goodrich‑Messier) main landing gear wheel assemblies, part numbers C20500000 and C20452000 (known to be fitted to Airbus A321 and others), to inspect the wheels following Service Bulletin C20452‑32‑3254 Revision 2 (or later) at each tyre change after 21 December 2006 and to repair any damage per that service bulletin before further flight. It responded to reports of hub corrosion and cracking under heat‑shield and bead‑seat areas that can lead to flange separation."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"N/A — this is a discrete, single-issue safety directive with no evidence of scope creep. It addresses one specific defect in two specific part numbers on one aircraft type."},"complexity_factors":["Single, specific technical requirement with clear compliance trigger (tyre change)","Only 2 part numbers affected, with explicit manufacturer reference","No nested exceptions or conditional logic — inspect and repair if damaged, full stop","Cross-reference to only one external document (EASA AD 2006-0328) and one service bulletin","No defined terms section — all terminology is standard aviation maintenance language","Extremely short document (~200 words of substantive content)"],"plain_english_summary":"This AD requires operators of Airbus A321s with specified Messier‑Goodrich main landing gear wheel assemblies to inspect wheel hubs for corrosion and cracking (especially beneath the heat shield) at every tyre change from 21 Dec 2006, and to follow Service Bulletin C20452‑32‑3254 (Rev 2+) for repairs. It’s mandatory, enforced by CASA, and aims to prevent wheel flange separation and catastrophic landing failures by ensuring defects are fixed before flight."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-whe-8-mlg-wheel-assembly-part-numbers-c20500000-and-c20452000","history":"/api/acts/ad-whe-8-mlg-wheel-assembly-part-numbers-c20500000-and-c20452000/history","analysis":"/api/acts/ad-whe-8-mlg-wheel-assembly-part-numbers-c20500000-and-c20452000/analysis","conflicts":"/api/acts/ad-whe-8-mlg-wheel-assembly-part-numbers-c20500000-and-c20452000/conflicts","importantCases":"/api/acts/ad-whe-8-mlg-wheel-assembly-part-numbers-c20500000-and-c20452000/important-cases","documents":"/api/acts/ad-whe-8-mlg-wheel-assembly-part-numbers-c20500000-and-c20452000/documents"}}