{"id":"F2006B10335","name":"AD/GY80/4 - Landing Gear Actuating Cylinder Attachment - Modification","slug":"ad-gy80-4-landing-gear-actuating-cylinder-attachment-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56091,"registerId":"commonwealth-F2006B10335-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GY80/4 - Landing Gear Actuating Cylinder Attachment - Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\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)  Aerospatiale GY 80 (Horizon) Series Aeroplanes\n\n \n\nAD/GY80/4 Landing Gear Actuating Cylinder Attachment - Modification\n\n\n3/72\n\n \n\nApplicability: All models.\n\n \n\nDocument: Sud Aviation SB No. 33.\n\n \n\nCompliance: Within 100 hours time in service after 31 May 1972.\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\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1972 addressing a specific mechanical defect in a particular aircraft type. It has not expanded beyond its original narrow safety purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section — uses plain technical language","No cross-references to other legislation beyond the enabling regulation (Civil Aviation Regulations 1998, Part 39)","Simple conditional structure: applicability → requirement → deadline","Single compliance pathway with clear time limit","No exceptions, exemptions, or nested conditions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:**\nRequires owners and operators of **Aerospatiale GY 80 (Horizon) series aeroplanes** to modify the **landing gear actuating cylinder attachment** — a critical component that helps extend and retract the aircraft's wheels.\n\n**Who it affects:**\n- Owners and operators of all models of the Aerospatiale GY 80 (Horizon) aircraft\n- Maintenance organisations servicing these aircraft\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety instructions. This particular directive addresses a specific mechanical issue with the landing gear system that, if left unaddressed, could potentially lead to landing gear failure. The modification must be carried out according to **Sud Aviation Service Bulletin No. 33** (the manufacturer's official technical instruction).\n\n**Deadline:**\nThe work must be completed **within 100 hours of flight time** after 31 May 1972.\n\n**Key point:** Non-compliance means the aircraft cannot legally fly in Australian airspace."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD applies to all Aerospatiale GY 80 (Horizon) series aircraft and mandates a modification specified in Sud Aviation SB No. 33 to the landing gear actuating cylinder attachment, with a compliance deadline of 100 hours time in service after 31 May 1972. The text does not indicate any change from an earlier or different scope; it establishes a clear, fleet‑wide mandatory action rather than narrowing or expanding applicability relative to the stated AD contents. (See: Applicability; Document; Compliance.)"},"complexity_factors":["Short directive with a single mandated modification action (low textual complexity).","Applies to entire model line (Applicability: All models) — broad scope but singular task.","Relies on an external technical document (Sud Aviation SB No. 33) for procedural detail — requires operators to obtain and follow separate material.","Fixed compliance window tied to service hours and a calendar reference (100 hours TIS after 31 May 1972) — introduces scheduling and recordkeeping requirements.","No technical detail in AD text increases reliance on maintenance organisations to interpret and implement the SB correctly."],"plain_english_summary":"This AD mandates a physical modification to the landing‑gear actuating‑cylinder attachment on all Aerospatiale GY 80 (Horizon) series aircraft, making compliance with Sud Aviation Service Bulletin No. 33 compulsory. Owners/operators must arrange and pay for the work and complete it within 100 hours TIS after 31 May 1972. The regulator sets the requirement; the SB contains the technical steps."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gy80-4-landing-gear-actuating-cylinder-attachment-modification","history":"/api/acts/ad-gy80-4-landing-gear-actuating-cylinder-attachment-modification/history","analysis":"/api/acts/ad-gy80-4-landing-gear-actuating-cylinder-attachment-modification/analysis","conflicts":"/api/acts/ad-gy80-4-landing-gear-actuating-cylinder-attachment-modification/conflicts","importantCases":"/api/acts/ad-gy80-4-landing-gear-actuating-cylinder-attachment-modification/important-cases","documents":"/api/acts/ad-gy80-4-landing-gear-actuating-cylinder-attachment-modification/documents"}}