{"id":"F2006B09608","name":"AD/EXTRA/9 - Bottom Fuselage Cover/Firewall Sealing","slug":"ad-extra-9-bottom-fuselage-cover-firewall-sealing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54358,"registerId":"commonwealth-F2006B09608-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nExtra EA-300 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/EXTRA/9 Bottom Fuselage Cover/Firewal","sectionType":"part","heading":"AD/EXTRA/9 Bottom Fuselage Cover/Firewall Sealing 1/2005","content":"# AD/EXTRA/9 Bottom Fuselage Cover/Firewall Sealing 1/2005\n\nDM\n\nApplicability: Aircraft affected by Part I of Requirement document: Model EA-300 aircraft, serial numbers 0 through 67. Model EA-300/S aircraft, serial numbers 0 through 31.\n\nModel EA-300/L aircraft, serial numbers 0 through 167, 168 through 170 (or\n\nconverted, 1168 through 1170), 1171, 172 (or converted to 1172), 173 (or converted\n\nto 1173), and 1174 through 1181.\n\nModel EA-300/200 aircraft, serial numbers 0 through 31\\. Aircraft affected by Part II of Requirement document:\n\nAll Model EA-300, EA-300/S, EA-300/L, and EA-300/200 aircraft.\n\nRequirement: Accomplish Part I and Part II of Extra Service Bulletin No. 300-4-04 Issue A, dated 25 May 2004.\n\nNote: LBA AD D-2004-489 refers.\n\nCompliance: Within 50 flight hours after 24 November 2004 or by 24 February 2005, whichever occurs first.\n\nThis Airworthiness Directive becomes effective on 24 November 2004.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope: addressing a specific airworthiness issue (firewall/fuselage sealing) on a defined aircraft type. There is no evidence of scope creep or expansion beyond the original safety purpose."},"complexity_factors":["Single, clearly defined applicability section with specific serial number ranges","Straightforward two-part requirement referencing a single external technical document (Service Bulletin)","Simple compliance deadline: the earlier of 50 flight hours or a fixed calendar date","No nested exceptions, conditional logic, or cross-references to other legislation","Minimal defined terms (only standard aviation terminology like 'flight hours')","Short document length (approximately 200 words of substantive content)"],"plain_english_summary":"This AD requires owners/operators of certain Extra EA-300 series aerobatic airplanes to carry out sealing of the bottom fuselage cover and firewall per Extra Service Bulletin No. 300-4-04 (25 May 2004). The mandated work must be done within 50 flight hours after 24 Nov 2004 or by 24 Feb 2005, whichever is first. It prevents engine fumes, smoke, or fire entering the cockpit, addressing an immediate safety risk in high-performance aerobatics."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument imposes mandatory corrective actions for specified EA-300 serial-number ranges (Part I) and for all EA-300 models (Part II) as set out in the referenced Service Bulletin. The AD text does not indicate any alteration or expansion of that scope beyond the stated applicability and compliance deadlines."},"complexity_factors":["Two-tier applicability: Part I applies only to specified serial-number ranges while Part II applies to all EA-300 variants (Applicability).","External-reference dependency: required corrective actions are those set out in Extra Service Bulletin No. 300-4-04 Issue A (Requirement).","Conditional compliance window: deadline is 'within 50 flight hours after 24 November 2004 or by 24 February 2005, whichever occurs first' (Compliance).","Serial-number mapping and conversions create parsing detail (e.g. '168 through 170 (or converted, 1168 through 1170)') (Applicability).","Cross-reference to a foreign authority AD (LBA AD D-2004-489) which may affect interpretation or supporting documentation (Note).","Regulatory basis and delegations referenced (subregulation 39.1(1) of CASR 1998), indicating delegated CASA decision-making (preamble)."],"plain_english_summary":"This directive orders owners/operators of certain Extra EA-300 series aeroplanes to carry out specific repairs and sealing work described in Extra Service Bulletin No. 300-4-04 (Parts I & II). It applies to listed serial-number ranges (Part I) and to all EA-300 variants (Part II). Owners/operators must complete the required work within 50 flight hours after 24 November 2004 or by 24 February 2005, whichever comes first; they bear the cost of compliance."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-extra-9-bottom-fuselage-cover-firewall-sealing","history":"/api/acts/ad-extra-9-bottom-fuselage-cover-firewall-sealing/history","analysis":"/api/acts/ad-extra-9-bottom-fuselage-cover-firewall-sealing/analysis","conflicts":"/api/acts/ad-extra-9-bottom-fuselage-cover-firewall-sealing/conflicts","importantCases":"/api/acts/ad-extra-9-bottom-fuselage-cover-firewall-sealing/important-cases","documents":"/api/acts/ad-extra-9-bottom-fuselage-cover-firewall-sealing/documents"}}