{"id":"F2006B10181","name":"AD/GAF-N22/34 - Horizontal Stabiliser Gust Lock - Installation","slug":"ad-gaf-n22-34-horizontal-stabiliser-gust-lock-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55826,"registerId":"commonwealth-F2006B10181-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAF-N22/34 - Horizontal Stabiliser Gust Lock - Installation","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-N22/34 Horizontal Stabiliser Gust Lock - Installation 4/80 Applicability:              All models N22, N22B, N24 and N24A with S/Nos. referenced in SB NMD-55-9. Document:               GAF SB No. NMD-55-9.\n\nCompliance: Before 1 August 1980.\n\n \n\nBackground:  The horizontal stabiliser and control system have been damaged by strong wind gusts even with the pilot’s control lock engaged.\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, time-bound safety directive with a narrow, specific purpose: mandating a single mechanical modification to specific aircraft models. There is no indication of scope creep; it addresses exactly the problem identified (wind damage to horizontal stabilisers) with a precise technical solution."},"complexity_factors":["Very short document (approximately 150 words)","Only 4 defined references (aircraft models and service bulletin number)","Single, unambiguous compliance requirement with fixed deadline","No cross-references to other legislation or regulations beyond the enabling Civil Aviation Regulations 1998","No conditional logic or exceptions","Straightforward factual background with clear causal link"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific GAF aircraft models (N22, N22B, N24, and N24A) to install a gust lock on the horizontal stabiliser (the small wing at the tail of the plane that keeps it stable in flight).\n\n**Why this matters:** Strong winds were damaging the tail section and control systems of these aircraft even when the standard pilot's control lock was engaged. This directive mandates a specific safety modification (detailed in Service Bulletin NMD-55-9) to prevent wind damage when the aircraft is parked on the ground.\n\n**Who must comply:** Anyone who owns or operates the affected GAF aircraft models with specific serial numbers listed in the referenced service bulletin.\n\n**Deadline:** The modification had to be completed before 1 August 1980."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's stated action (install a gust lock per GAF SB NMD-55-9 on the listed models/serial numbers) matches the stated background concern (damage from gusts). The source text shows no indication that the scope has been altered from its stated purpose."},"complexity_factors":["Direct, single-action requirement: install gust lock (low procedural complexity) (Compliance)","Narrow applicability limited to specific models and serial numbers referenced in an external service bulletin (Applicability; Document)","Reliance on an external technical document for installation details (Document)","Short, absolute compliance deadline with no detail in this text about extensions, enforcement, or exemptions (Compliance)","Lack of cost, funding or enforcement detail in the directive increases practical uncertainty for affected operators (Compliance; Document)"],"plain_english_summary":"The directive requires owners/operators of specified GAF N22/N24 aeroplanes (serial numbers listed in GAF SB No. NMD‑55‑9) to install a horizontal stabiliser gust lock per that service bulletin, completed before 1 August 1980. It is imposed because wind gusts have damaged the stabiliser/control system despite the pilot’s control lock; the AD sets the mandate and deadline, while costs, labour and enforcement details are not specified."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-34-horizontal-stabiliser-gust-lock-installation","history":"/api/acts/ad-gaf-n22-34-horizontal-stabiliser-gust-lock-installation/history","analysis":"/api/acts/ad-gaf-n22-34-horizontal-stabiliser-gust-lock-installation/analysis","conflicts":"/api/acts/ad-gaf-n22-34-horizontal-stabiliser-gust-lock-installation/conflicts","importantCases":"/api/acts/ad-gaf-n22-34-horizontal-stabiliser-gust-lock-installation/important-cases","documents":"/api/acts/ad-gaf-n22-34-horizontal-stabiliser-gust-lock-installation/documents"}}