{"id":"F2006B10205","name":"AD/GAF-N22/57 - Oxygen - Cabin Supply Pipe","slug":"ad-gaf-n22-57-oxygen-cabin-supply-pipe","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55863,"registerId":"commonwealth-F2006B10205-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAF-N22/57 - Oxygen - Cabin Supply Pipe","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-N22/57 Oxygen - Cabin Supply Pipe 4/90\n\nApplicability: All series with oxygen outlets in the passenger cabin. (Customer Options G71B, G71C, or R72).\n\n \n\nRequirement: Action in accordance with ASTA Nomad SB NMD-35-02. Compliance:  Within 100 hours time in service after 30 April 1990.\n\nBackground: To prevent electrical contact with cabin oxygen lines.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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, single-issue airworthiness directive addressing a specific safety defect in a specific aircraft type. It has not expanded beyond its original purpose of preventing electrical contact with oxygen lines."},"complexity_factors":["Very short document (approximately 150 words)","Only 3 defined applicability criteria (customer option codes)","Single requirement referencing an external technical document (service bulletin)","No nested exceptions or conditional logic","No cross-references to other legislation or regulations","Straightforward compliance deadline (100 hours time in service after fixed date)"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nOrders owners and operators of certain GAF Nomad aircraft (models N22 and N24 series) to inspect and fix the oxygen supply pipes in the passenger cabin. The fix must follow a specific manufacturer's service bulletin (ASTA Nomad SB NMD-35-02).\n\n**Who it affects:**\n- Owners and operators of GAF Nomad N22 and N24 series aeroplanes\n- Specifically those fitted with passenger cabin oxygen outlets (identified by customer option codes G71B, G71C, or R72)\n\n**Why it matters:**\nThe directive addresses a safety risk where electrical wiring could touch the cabin oxygen lines. This is dangerous because oxygen can ignite or explode if it contacts electrical sparks or heat sources. The fix must be completed within 100 flight hours after 30 April 1990.\n\n**Key deadline:**\nCompliance required within 100 hours of flight time after 30 April 1990."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD's scope, as expressed, applies to GAF N22 and N24 series aeroplanes that have passenger cabin oxygen outlets installed under Customer Options G71B, G71C or R72. The stated purpose is to prevent electrical contact with cabin oxygen lines. Based on the instrument text provided, the scope is narrowly targeted to those aircraft and does not indicate any broadening or narrowing from an earlier or original intent beyond that statement."},"complexity_factors":["Directive is short and prescriptive rather than containing multiple regulatory options or tests.","References an external technical document (ASTA Nomad SB NMD-35-02), shifting technical complexity outside the AD.","Applicability is limited to aircraft with specified customer options (G71B, G71C, R72), requiring identification of affected airframes.","Fixed, short compliance window (100 hours after 30 April 1990) imposes scheduling constraints but no ongoing administrative regime.","The AD leaves technical method to the service bulletin, reducing regulatory discretion but creating dependency on the SB's clarity and parts availability."],"plain_english_summary":"This AD (AD/GAF‑N22/57, 4/90) requires operators of GAF N22/N24 aeroplanes fitted with cabin oxygen outlets under Customer Options G71B, G71C or R72 to carry out the work specified in ASTA Nomad Service Bulletin NMD‑35‑02 within 100 hours TIS after 30 April 1990. It’s intended to prevent electrical contact with cabin oxygen lines; costs, scheduling and compliance fall to affected owners/operators and their maintenance providers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-57-oxygen-cabin-supply-pipe","history":"/api/acts/ad-gaf-n22-57-oxygen-cabin-supply-pipe/history","analysis":"/api/acts/ad-gaf-n22-57-oxygen-cabin-supply-pipe/analysis","conflicts":"/api/acts/ad-gaf-n22-57-oxygen-cabin-supply-pipe/conflicts","importantCases":"/api/acts/ad-gaf-n22-57-oxygen-cabin-supply-pipe/important-cases","documents":"/api/acts/ad-gaf-n22-57-oxygen-cabin-supply-pipe/documents"}}