{"id":"F2006B10172","name":"AD/GAF-N22/25 - Air Intake Anti-Icing Valve - Inspection and Modification","slug":"ad-gaf-n22-25-air-intake-anti-icing-valve-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55811,"registerId":"commonwealth-F2006B10172-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAF-N22/25 - Air Intake Anti-Icing Valve - Inspection and 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)  GAF N22 and N24 Series Aeroplanes\n\n \n\nAD/GAF-N22/25 Air Intake Anti-Icing Valve - Inspection\n\nand Modification\n\nApplicability: All models N22, N22B, N24 and N24A. Document: GAF Alert SB No. AN22-30-1.\n\nCompliance: As detailed in requirement document.\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\n1/79\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-purpose airworthiness directive focused on one specific mechanical component. It has not expanded beyond its original safety purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section — uses plain language","Single, straightforward requirement: inspect and modify a specific component","No nested exceptions or conditional logic","Simple cross-reference to one external document (the manufacturer's service bulletin)","Clear applicability statement listing exact aircraft models"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA).\n\n**What it does:**\n- Requires owners and operators of specific GAF aircraft models (N22, N22B, N24, and N24A) to inspect and modify the **air intake anti-icing valve**.\n- An anti-icing valve prevents ice from forming in the engine's air intake, which is critical for safe flight. If this valve fails, ice could block airflow to the engine and cause power loss or engine failure.\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains GAF N22 or N24 series aeroplanes (these are Australian-designed utility aircraft, often used for agricultural work, surveying, or regional transport).\n\n**Why it matters:**\n- This is a **mandatory compliance** requirement. You cannot legally fly these aircraft until the inspection and modification are completed as specified in the referenced document (GAF Alert Service Bulletin No. AN22-30-1).\n- The \"1/79\" at the bottom indicates this directive was first issued in January 1979, suggesting this is a long-standing safety requirement for this aircraft type."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The text of the AD sets out an inspection and modification requirement for the air intake anti-icing valve and explicitly applies to all N22, N22B, N24 and N24A models (see \"Applicability\"). The AD does not indicate any alteration or expansion of scope relative to an earlier intent within the text provided; it simply refers operators to GAF Alert SB AN22-30-1 for the required actions and timing (see: \"Document: GAF Alert SB No. AN22-30-1\" and \"Compliance: As detailed in requirement document\")."},"complexity_factors":["Relies on an external service bulletin (GAF Alert SB No. AN22-30-1) for all technical detail and compliance timing (source: \"Document: GAF Alert SB No. AN22-30-1\"; \"Compliance: As detailed in requirement document\").","Broad applicability across four aircraft models (N22, N22B, N24, N24A) increases the number of affected operators and maintenance contexts (source: \"Applicability: All models N22, N22B, N24 and N24A\").","Regulatory enforcement: the AD is issued under CASA’s Schedule of Airworthiness Directives, creating mandatory compliance obligations (source header: \"Civil Aviation Safety Authority\"; \"Schedule of Airworthiness Directives\").","Operational impact depends on technical requirements in the referenced bulletin (inspection scope, modification complexity, parts, and downtime), which are not stated in the AD text itself (source: \"Compliance: As detailed in requirement document\").","Potential administrative burden for record-keeping and demonstrating compliance to regulators and auditors, again delegated to the service bulletin's requirements (source: Compliance reference)."],"plain_english_summary":"This airworthiness directive (AD/GAF‑N22/25) requires inspection and, if necessary, modification of the air intake anti‑icing valve on GAF N22, N22B, N24 and N24A aeroplanes. Compliance must follow the procedures and times set out in GAF Alert Service Bulletin No. AN22‑30‑1.\n\nIt affects aircraft owners/operators, maintenance organisations and certificated engineers (with CASA enforcing compliance). It matters for airworthiness and safety and creates mandatory maintenance costs, downtime and record‑keeping tied to the referenced service bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-25-air-intake-anti-icing-valve-inspection-and-modification","history":"/api/acts/ad-gaf-n22-25-air-intake-anti-icing-valve-inspection-and-modification/history","analysis":"/api/acts/ad-gaf-n22-25-air-intake-anti-icing-valve-inspection-and-modification/analysis","conflicts":"/api/acts/ad-gaf-n22-25-air-intake-anti-icing-valve-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-gaf-n22-25-air-intake-anti-icing-valve-inspection-and-modification/important-cases","documents":"/api/acts/ad-gaf-n22-25-air-intake-anti-icing-valve-inspection-and-modification/documents"}}