{"id":"F2006B10208","name":"AD/GAF-N22/6 - Rudder and Stabiliser Trim Systems - Chain Replacement","slug":"ad-gaf-n22-6-rudder-and-stabiliser-trim-systems-chain-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55866,"registerId":"commonwealth-F2006B10208-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAF-N22/6 - Rudder and Stabiliser Trim Systems - 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-N22/6  Rudder and Stabiliser Trim Systems - Chain Replacement\n\nApplicability: Model N22 with S/Nos. N22-1 and N22-4. Document:  GAF SB No. N22.27.2.\n\nCompliance: Within 300 hours time in service after 28 November 1975.\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\n12/75\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive from 1975 affecting only two specific aircraft. It has not expanded beyond its original narrow scope."},"complexity_factors":["Extremely short document (approximately 100 words)","Only 2 specific aircraft affected (by serial number)","Single, unambiguous compliance action (chain replacement)","Clear deadline (300 hours time in service from specified date)","No defined terms, cross-references, or conditional logic","References only one technical document (GAF Service Bulletin N22.27.2)"],"plain_english_summary":"**What this is:** 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 requires:** Owners and operators of specific GAF N22 aircraft (serial numbers N22-1 and N22-4) must replace the chains in their **rudder and stabiliser trim systems**. These are flight control components that help steer the aircraft and adjust its pitch balance.\n\n**When to do it:** Within 300 hours of flight time after 28 November 1975.\n\n**Why it matters:** Worn or faulty chains in these critical control systems could lead to loss of control of the aircraft. This directive ensures these specific early-production aircraft receive necessary safety maintenance.\n\n**Who must follow it:** Anyone operating the two specified GAF N22 aircraft (a small Australian-made utility aircraft from the 1970s). Compliance is mandatory — you cannot legally fly these aircraft without completing this work."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument maintains a narrowly confined scope: it applies only to two specific airframes (Model N22, serial numbers N22-1 and N22-4) and mandates a single maintenance action (replacement of the rudder and stabiliser trim chain(s)) to be completed within a set flight‑hours window after 28 November 1975. There is no text in the supplied instrument indicating any expansion or contraction of that scope from its original specification. (Applicability, Compliance, Document)"},"complexity_factors":["Very narrow applicability (only Model N22, S/Ns N22-1 and N22-4) which reduces legal and operational complexity (Applicability).","Clear, single compliance deadline expressed in flight hours which lowers compliance ambiguity (Compliance).","Technical execution depends on an external manufacturer service bulletin (GAF SB No. N22.27.2), creating operational dependence on that document and on parts/procedures availability (Document).","Costs and scheduling burdens fall on owners/operators (parts, labour, downtime) but the rule does not prescribe procurement or approval processes, which can create practical complexity for operators (Applicability, Compliance).","Limited regulatory discretion in the directive text reduces legal complexity but shifts technical discretion to maintenance organisations applying the service bulletin (Document, Compliance).","Verification and record-keeping requirements implied by a compliance deadline introduce modest administrative tasks for operators (Compliance)."],"plain_english_summary":"This directive requires replacement of the rudder and stabiliser trim chains on GAF Model N22 airframes S/N N22‑1 and N22‑4, performed per GAF SB No. N22.27.2 within 300 flight hours after 28 Nov 1975.  \n\nOwners/operators must arrange and pay for the work, keep compliance records, and schedule it with an authorised maintenance organisation to meet the deadline and avoid enforcement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-6-rudder-and-stabiliser-trim-systems-chain-replacement","history":"/api/acts/ad-gaf-n22-6-rudder-and-stabiliser-trim-systems-chain-replacement/history","analysis":"/api/acts/ad-gaf-n22-6-rudder-and-stabiliser-trim-systems-chain-replacement/analysis","conflicts":"/api/acts/ad-gaf-n22-6-rudder-and-stabiliser-trim-systems-chain-replacement/conflicts","importantCases":"/api/acts/ad-gaf-n22-6-rudder-and-stabiliser-trim-systems-chain-replacement/important-cases","documents":"/api/acts/ad-gaf-n22-6-rudder-and-stabiliser-trim-systems-chain-replacement/documents"}}