{"id":"F2006B01941","name":"AD/A320/51 - Main Landing Gear Rear Pintle Pin","slug":"ad-a320-51-main-landing-gear-rear-pintle-pin","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41163,"registerId":"commonwealth-F2006B01941-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/A320/51 - Main Landing Gear Rear Pintle Pin","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue 5/1995,Aircraft above 5700 kg,Airbus Industrie A319, A320 and A321 Series Aeroplanes,Main Landing Gear Rear Pintle Pin,51\ntitle: Airworthiness Directive - AD/A320/51 - Main Landing Gear Rear Pintle Pin\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Airbus Industrie A319, A320 and A321 Series Aeroplanes\n\n \n\nAD/A320/51 Main Landing Gear Rear Pintle Pin 5/95\n\nApplicability: A320 S/N 002 to 008, 010 to 014 and 016 to 021.\n\n \n\nRequirement: Replace the rear pintle pin in the main landing gear in accordance with Airbus Industrie Service Bulletin A320-32-1024.\n\n \n\nNote: DGAC AD 94-240-061(B) refers.\n\n \n\nCompliance: Before 20000 landings or during the next main landing gear overhaul, whichever occurs first.\n\n \n\nBackground: Three cracked pins have been found on the fatigue specimen. To improve the fatigue performance, A320-100 pins are replaced by A320-200 pins on aircraft in service.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope is limited to replacing the rear pintle pin on the explicitly listed serial-numbered aircraft; the text provides no indication it expands or narrows that applicability beyond the stated list or the described compliance window."},"complexity_factors":["Technical specificity: a single component (rear pintle pin) with a required replacement type (A320-200 pins) and reference to an external service bulletin (A320-32-1024).","Narrow applicability: applies only to listed serial numbers (A320 S/N 002–008, 010–014, 016–021), requiring precise fleet identification.","Timing constraint: compliance before 20,000 landings or at next main landing gear overhaul, whichever is earlier, which affects maintenance scheduling.","Safety-critical nature: addresses fatigue cracking discovered on specimen testing, so conservative compliance and documentation are expected.","Operational logistics: parts availability, workshop capacity and overhaul scheduling create implementation and cost considerations for operators.","External regulatory reference: notes DGAC AD 94-240-061(B), implying coordination with foreign authority directives and records."],"plain_english_summary":"This directive requires replacement of the rear pintle pin in the main landing gear on specified Airbus A320 family aircraft serial numbers, using Airbus Service Bulletin A320‑32‑1024. Operators and their maintenance organisations must complete the change before 20,000 landings or at the next main landing gear overhaul, arranging parts and bearing associated costs. CASA states the action responds to three cracked pins found on a fatigue specimen and improves fatigue performance by fitting A320‑200 pins in place of A320‑100 pins."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating replacement of a defective landing gear component."},"complexity_factors":["Very short document (approximately 150 words)","Only 1 defined applicability criterion (specific serial number ranges)","Single, unambiguous compliance requirement with clear deadline","No cross-references to other legislation (only a reference to a French aviation authority notice and an Airbus technical bulletin)","No conditional logic or nested exceptions","Straightforward mechanical/technical instruction with minimal legal drafting"],"plain_english_summary":"This CASA Airworthiness Directive mandates replacement of the rear pintle pin in the main landing gear on certain early Airbus A320‑100 aircraft (specific early serial numbers) because fatigue testing found cracked pins. Operators must install the redesigned, stronger pintle pins per Airbus service instructions before 20,000 landings or at the next gear overhaul. The action prevents possible pintle failure and main-gear collapse on landing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a320-51-main-landing-gear-rear-pintle-pin","history":"/api/acts/ad-a320-51-main-landing-gear-rear-pintle-pin/history","analysis":"/api/acts/ad-a320-51-main-landing-gear-rear-pintle-pin/analysis","conflicts":"/api/acts/ad-a320-51-main-landing-gear-rear-pintle-pin/conflicts","importantCases":"/api/acts/ad-a320-51-main-landing-gear-rear-pintle-pin/important-cases","documents":"/api/acts/ad-a320-51-main-landing-gear-rear-pintle-pin/documents"}}