{"id":"F2006B10194","name":"AD/GAF-N22/47 - Engine Air Intake Modification","slug":"ad-gaf-n22-47-engine-air-intake-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55852,"registerId":"commonwealth-F2006B10194-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAF-N22/47 - Engine Air Intake 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-N22/47 Engine Air Intake Modification 9/82\n\nApplicability: All Nomad N22 and N24 series aeroplanes. Document:  GAF SB No. NMD-71-6 Rev. 2.\n\nCompliance: Before 30 June 1983.\n\n \n\nBackground:  This modification is required to provide engine inlet icing protection over the full certification envelope.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text contains no indication that the scope was altered from an earlier intent. The directive as presented applies to all Nomad N22 and N24 series aeroplanes and specifies a single technical solution by reference to a manufacturer service bulletin, with a fixed compliance date."},"complexity_factors":["Narrow, explicit applicability (all Nomad N22 and N24 series) reduces scope ambiguity (Applicability).","Mandatory compliance by a fixed date creates scheduling pressure and operational planning needs (Compliance).","Technical content and precise installation instructions are delegated to an external service bulletin, so implementers must consult that document to complete the work (Document).","The AD text contains a stated safety objective but minimal implementation detail, increasing dependence on maintenance providers and the service bulletin for practical execution (Background; Document).","No exemptions, phased compliance or alternative-compliance procedures are specified in the AD text, which concentrates decision-making on the issuing authority and on operators to comply on schedule (header; Compliance)."],"plain_english_summary":"This airworthiness directive from the Civil Aviation Safety Authority requires all GAF Nomad N22 and N24 aeroplanes to have their engine air intakes modified per GAF Service Bulletin NMD‑71‑6 Rev. 2 to provide full-envelope engine inlet icing protection. The work was required by 30 June 1983, so owners/operators must arrange and typically fund the modification, following the manufacturer’s instructions and scheduling any downtime or parts/skill needs."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive focused on a specific technical modification. It has not expanded beyond its original purpose of addressing engine inlet icing protection for the Nomad aircraft series."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section — uses plain language and references external technical document","Single, unambiguous compliance requirement with fixed deadline","No conditional logic, exceptions, or nested provisions","Simple structure: applicability → document reference → compliance date → brief background","Cross-reference limited to one external service bulletin (GAF SB No. NMD-71-6 Rev. 2)"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** It requires owners and operators of all **GAF Nomad N22 and N24 series aeroplanes** to modify the engine air intake system. The specific work is detailed in **GAF Service Bulletin NMD-71-6 Revision 2**.\n\n**Why it matters:** The modification prevents ice from building up in the engine's air intake across the full range of conditions the aircraft was certified to fly in. Without this fix, ice could restrict airflow to the engines, potentially causing engine failure or loss of power — a serious safety risk, especially in cold or moist conditions.\n\n**Who must comply:** Anyone operating these specific Australian-designed twin-turboprop aircraft (the Nomad series, originally built by Government Aircraft Factories).\n\n**Deadline:** The work had to be completed before **30 June 1983**.\n\n**Key point:** This is a **retrospective safety mandate** — it applies to aircraft already in service, not just new ones. Ignoring it would breach civil aviation regulations and ground the aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-47-engine-air-intake-modification","history":"/api/acts/ad-gaf-n22-47-engine-air-intake-modification/history","analysis":"/api/acts/ad-gaf-n22-47-engine-air-intake-modification/analysis","conflicts":"/api/acts/ad-gaf-n22-47-engine-air-intake-modification/conflicts","importantCases":"/api/acts/ad-gaf-n22-47-engine-air-intake-modification/important-cases","documents":"/api/acts/ad-gaf-n22-47-engine-air-intake-modification/documents"}}