{"id":"F2006B09603","name":"AD/EXTRA/4 - Air Inlet Screen","slug":"ad-extra-4-air-inlet-screen","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54341,"registerId":"commonwealth-F2006B09603-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/EXTRA/4 - Air Inlet Screen","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)  Extra EA-300 Series Aeroplanes\n\n \n\nAD/EXTRA/4 Air Inlet Screen 6/95\n\nApplicability: EA-300, EA-300/S aircraft detailed by serial number in Extra EA-300 Service Bulletin No. 300-5-94.\n\n \n\nRequirement: Action in accordance with Extra EA-300 Service Bulletin No. 300-5-94.\n\n \n\nNote: LBA Airworthiness Directive 95-125 Extra refers.\n\n \n\nCompliance: Effective 25 May 1995: At next annual inspection or within 100 hours time in service, whichever occurs first.\n\n \n\nBackground:  This Directive has been issued to require the installation of an air inlet screen. The requirement reflects advice that provision of an air inlet screen will reduce the exposure of the engine to any particles entering the injector throat. Especially in the case of a bird strike.\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 focused specifically on installing an air inlet screen for a particular aircraft model. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 2 defined applicability criteria (aircraft model and serial numbers referenced externally)","Single requirement with clear external reference to manufacturer service bulletin","Simple binary compliance condition (next annual OR 100 hours, whichever first)","No nested exceptions, conditional logic, or cross-references to other legislation","Background explanation provided in plain language"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** It requires owners or operators of certain Extra EA-300 series aeroplanes (high-performance aerobatic planes) to install an air inlet screen on the engine. This is a physical mesh or filter that stops debris — particularly important in the event of a bird strike — from getting into the engine's fuel injector system.\n\n**Who it affects:** Anyone who owns or operates an Extra EA-300 or EA-300/S aircraft with specific serial numbers listed in Extra Service Bulletin No. 300-5-94.\n\n**What must be done:** The aircraft must be modified according to the manufacturer's service bulletin. This must happen by the earlier of either:\n- The next annual inspection, **or**\n- Within 100 hours of flight time\n\n**Why it matters:** Without this screen, the engine's injector throat is exposed to foreign particles. In a bird strike, debris could enter and damage the engine, potentially causing engine failure during flight. This is a straightforward safety fix to prevent catastrophic engine damage."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive's scope matches its stated purpose: it applies only to identified Extra EA‑300 serial numbers and requires installation of the air inlet screen per the service bulletin to reduce particle ingestion. The text contains no broader or additional obligations beyond the installation requirement and its compliance timing (Applicability; Requirement; Background; Compliance)."},"complexity_factors":["Narrow applicability limited to EA‑300 aircraft listed by serial number (Applicability).","Mandatory action relies on an external manufacturer service bulletin for technical steps (Requirement: Extra EA‑300 Service Bulletin No. 300-5-94).","Short, fixed compliance window tied to next annual inspection or 100 flight hours (Compliance).","Technical installation may require parts and qualified maintenance, creating a modest logistical burden (Requirement/Service Bulletin).","Enforcement via the Airworthiness Directive mechanism creates a regulatory compliance obligation (Schedule of Airworthiness Directives).","Cross-reference to a foreign authority AD (LBA AD 95-125) introduces reliance on related overseas findings (Note)."],"plain_english_summary":"Requires owners/operators of specified Extra EA‑300 aeroplanes to install an air‑inlet screen in accordance with Extra Service Bulletin No. 300‑5‑94 (Requirement; Applicability). Compliance must occur at the next annual inspection or within 100 hours time in service, whichever is first; the owner/operator bears the installation and compliance burden and maintenance providers must follow the service bulletin. The stated purpose is to reduce engine exposure to particles entering the injector throat (e.g. bird strike) (Compliance; Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-extra-4-air-inlet-screen","history":"/api/acts/ad-extra-4-air-inlet-screen/history","analysis":"/api/acts/ad-extra-4-air-inlet-screen/analysis","conflicts":"/api/acts/ad-extra-4-air-inlet-screen/conflicts","importantCases":"/api/acts/ad-extra-4-air-inlet-screen/important-cases","documents":"/api/acts/ad-extra-4-air-inlet-screen/documents"}}