{"id":"F2016L01908","name":"AD/A320/21 Amdt 2 - Main Landing Gear Wheel Axle","slug":"ad-a320-21-amdt-2-main-landing-gear-wheel-axle","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":95574,"registerId":"commonwealth-F2016L01908-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Airbus Industrie A319, A320 and A321 Ser","sectionType":"part","heading":"Airbus Industrie A319, A320 and A321 Series Aeroplanes","content":"# Airbus Industrie A319, A320 and A321 Series Aeroplanes\n\n| AD/A320/21 Amdt 2 | Main Landing Gear Wheel Axle | 25/2016 |\n| ----------------- | ---------------------------- | ------- |\n\n| Applicability: | Airbus Industrie A320 Series aircraft, Models A320-111, A320-211, A320-231, Serial Numbers MSN 002 to 044, 052 to 055, 059 to 073, 076 to 078 and 081, fitted with twin wheel main landing gear.                                                                                                                                                                                                                                                    |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Comply with the Technical Requirements of French Direction Générale de l'Aviation Civile (DGAC) AD 90-096-010 (B), dated 2 May 1990, as in force at the date of this AD.Note: the DGAC AD references Airbus Industrie Service Bulletin A320-32-1031, Revision 1, dated 19 March 1990.                                                                                                                                                               |\n| Compliance:    | Prior to the accumulation of 6600 flights.                                                                                                                                                                                                                                                                                                                                                                                                          |\n|                | This AD commences on 14 December 2016.                                                                                                                                                                                                                                                                                                                                                                                                              |\n| Background:    | The chrome plate grinding process used during manufacture may have caused overheating of the main landing gear axle and introduced residual stresses in the flange to axle radius. In some sliding tube assemblies, this has caused cracks under the chrome plating in the area of the brake mounting flange, with a subsequent reduction in safe operating life.Amendment 2 is issued to clarify the version of the DGAC AD to be complied with. . |\n\n![](image.001.png)\n\nBenjamin Wilson  \nDelegate of the Civil Aviation Safety Authority\n\n5 December 2016","sortOrder":0},{"sectionNumber":"AD/A320/21 Amdt 2","sectionType":"part","heading":"AD/A320/21 Amdt 2","content":"## AD/A320/21 Amdt 2","sortOrder":1},{"sectionNumber":"Main Landing Gear Wheel Axle","sectionType":"part","heading":"Main Landing Gear Wheel Axle","content":"## Main Landing Gear Wheel Axle","sortOrder":2},{"sectionNumber":"25/2016","sectionType":"part","heading":"25/2016","content":"## 25/2016","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment does not expand scope; it merely clarifies which version of the referenced French DGAC AD must be complied with. The original AD and Amendment 1 already applied to these aircraft."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined applicability criterion (specific serial numbers)","Single compliance requirement referencing an external document","No nested exceptions or conditional logic","Straightforward amendment purpose (clarification only)","Minimal cross-referencing (one French AD and one Airbus service bulletin)"],"plain_english_summary":"This AD mandates inspection or repair of main landing‑gear wheel axles on certain early Airbus A320‑111/211/231 aircraft (twin‑wheel MLG, specified serial ranges) before 6,600 total flights. It adopts DGAC AD 90‑096‑010 (per an Airbus service bulletin) because an overheated chrome‑plating process can create hidden cracks that shorten axle life and risk failure. This Amendment 2 clarifies which version of the French directive must be followed."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 2 does not broaden the affected fleet or add new technical requirements; it clarifies which version of the French DGAC AD must be complied with (DGAC AD 90-096-010(B), dated 2 May 1990). The core obligation—comply with the DGAC technical requirements before 6,600 flights—remains unchanged; the amendment reduces ambiguity about the documentary reference (source: Requirement; Background; Compliance)."},"complexity_factors":["Narrow, precise applicability: specific A320 models and exact serial number ranges (MSN 002–044, 052–055, 059–073, 076–078, 081) with twin-wheel main gear (source: Applicability).","Cross-jurisdictional reference: mandates compliance with another regulator's AD (French DGAC AD 90-096-010(B), dated 2 May 1990) rather than reproducing measures in full (source: Requirement).","External technical document dependency: DGAC AD references Airbus Service Bulletin A320-32-1031 Revision 1, creating layered compliance materials to review and apply (source: Requirement Note).","Operational threshold compliance: obligation tied to a flight-cycle limit (prior to accumulation of 6,600 flights), requiring operators to track life-limits and schedule actions (source: Compliance).","Amendment nature: current amendment is clarificatory about which version of the DGAC AD applies, adding administrative interpretation risk but not new technical measures (source: Background).","Technical cause described (chrome plating overheating and residual stress causing cracks) requires inspection/repair actions rather than simple paperwork, increasing maintenance complexity (source: Background).","Specified commencement date imposes a fixed regulatory timeline (commences 14 December 2016), limiting operator discretion on scheduling (source: Compliance)."],"plain_english_summary":"This AD requires certain Airbus A320-series aeroplanes (specified serial numbers with twin-wheel main landing gear) to comply with the technical requirements of French DGAC AD 90-096-010(B) to address cracking risk in the main landing gear axle. Operators must complete the required actions before accumulating 6,600 flights, which creates inspection, repair and scheduling costs for affected aircraft and imposes a regulatory compliance decision on operators."},"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-a320-21-amdt-2-main-landing-gear-wheel-axle","history":"/api/acts/ad-a320-21-amdt-2-main-landing-gear-wheel-axle/history","analysis":"/api/acts/ad-a320-21-amdt-2-main-landing-gear-wheel-axle/analysis","conflicts":"/api/acts/ad-a320-21-amdt-2-main-landing-gear-wheel-axle/conflicts","importantCases":"/api/acts/ad-a320-21-amdt-2-main-landing-gear-wheel-axle/important-cases","documents":"/api/acts/ad-a320-21-amdt-2-main-landing-gear-wheel-axle/documents"}}