{"id":"F2006B10186","name":"AD/GAF-N22/4 - Landing Gear Retraction System - Chain Replacement","slug":"ad-gaf-n22-4-landing-gear-retraction-system-chain-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55844,"registerId":"commonwealth-F2006B10186-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAF-N22/4 - Landing Gear Retraction System - Chain Replacement","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)  GAF N22 and N24 Series Aeroplanes\n\n \n\nAD/GAF-N22/4  Landing Gear Retraction System - Chain Replacement\n\nApplicability: Model N22 with S/Nos. N22-1 and N22-4. Document:  GAF SB No. N22.32.2.\n\nCompliance: Before achieving 500 hours time 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\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\n10/75\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive affecting two specific aircraft by serial number. It has not expanded beyond its original purpose of addressing a specific landing gear chain defect."},"complexity_factors":["Extremely short document (approximately 100 words of substantive content)","Only 2 specific aircraft affected by serial number","Single compliance requirement with clear threshold (500 hours)","No defined terms section","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","Single technical reference to manufacturer service bulletin","No conditional logic, exceptions, or nested provisions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA). It mandates a safety fix for specific GAF aircraft.\n\n**What it does:**\n- Requires owners/operators of **GAF N22 model aeroplanes** with **serial numbers N22-1 and N22-4** to replace the landing gear retraction system chain.\n- The work must be done **before the aircraft reaches 500 hours of flight time** (time in service).\n\n**Who it affects:**\n- Owners and operators of two specific GAF N22 aircraft (those with serial numbers N22-1 and N22-4).\n- Maintenance engineers working on these aircraft.\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety orders. If the chain in the landing gear retraction system fails, the landing gear might not extend or retract properly—potentially causing a crash on landing or takeoff. This AD prevents that failure by forcing replacement of a worn or defective part before it reaches a critical wear point.\n\n**Key details:**\n- **Compliance deadline:** Before 500 hours time in service (measured from when the aircraft entered service, not calendar time).\n- **Technical reference:** GAF Service Bulletin No. N22.32.2 (the manufacturer's official repair instructions)."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The supplied text contains a single, narrowly framed requirement applying to two identified aircraft (Applicability) with a fixed compliance time (Compliance) and a reference to a technical service bulletin (Document). There is no indication in the supplied text that the scope has been altered from an earlier or original intent."},"complexity_factors":["Very narrow applicability limited to two specific serial numbers (Applicability).","Single, explicit mandated action (chain replacement) with a single clear deadline (Compliance).","Technical execution delegated to an external service bulletin (GAF SB No. N22.32.2) which is referenced but not reproduced (Document) — adds a retrieval step but not legal ambiguity.","Issued under an established regulatory instrument (Civil Aviation Regulations, Part 39) so legal force is clear from the header, reducing interpretive complexity.","Lack of explanatory detail or mitigation options in the supplied text means implementers must consult the service bulletin for procedure and parts, but that is an operational rather than a legal complexity (Document)."],"plain_english_summary":"This airworthiness directive requires replacing the landing‑gear retraction‑system chain on GAF Model N22 aeroplanes serial nos. N22‑1 and N22‑4, to be done per GAF SB No. N22.32.2 before the aeroplane reaches 500 hours TIS. It directly affects the named owners/operators and their maintenance providers; compliance (and associated parts, labour and downtime costs) is mandatory to keep the aircraft conforming under Part 39."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-4-landing-gear-retraction-system-chain-replacement","history":"/api/acts/ad-gaf-n22-4-landing-gear-retraction-system-chain-replacement/history","analysis":"/api/acts/ad-gaf-n22-4-landing-gear-retraction-system-chain-replacement/analysis","conflicts":"/api/acts/ad-gaf-n22-4-landing-gear-retraction-system-chain-replacement/conflicts","importantCases":"/api/acts/ad-gaf-n22-4-landing-gear-retraction-system-chain-replacement/important-cases","documents":"/api/acts/ad-gaf-n22-4-landing-gear-retraction-system-chain-replacement/documents"}}