{"id":"F2006B09604","name":"AD/EXTRA/5 Amdt 1 - Upper Longeron Cutout Bridge","slug":"ad-extra-5-amdt-1-upper-longeron-cutout-bridge","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54344,"registerId":"commonwealth-F2006B09604-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/EXTRA/5 Amdt 1 - Upper Longeron Cutout Bridge","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Safety Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \n\nAIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nOn the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/EXTRA/5 and issues the following 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\nExtra EA-300 Series Aeroplanes\n\nAD/EXTRA/5\n\nAmdt 1\n\n  \nUpper Longeron Cutout Bridge 9/2004\n\nApplicability: Model EA-300 aircraft, serial numbers V1 and 01 through 50, and Model EA-300/S aircraft, serial numbers 01 through 17.\n\nRequirement: Action in accordance with the requirements of Extra Service Bulletin SB-300-3-93 Issue B, dated 10 June 1998.\n\nNote 1: If aircraft is modified in accordance with Procedure I of SB-300-3-93 Issue B, no further action is required.\n\nNote 2: LBA AD D-1994-043R1 refers.\n\nCompliance: Before the accumulation of 1,000 flight hours.\n\nIf action is required in accordance with Procedure II, exchange the bridges at intervals not to exceed 1,000 flight hours.\n\nThis Amendment becomes effective on 2 September 2004.\n\nBackground: Cracking has been experienced during the fatigue test.\n\nAmendment 1 is issued in response to a new LBA AD, which was prompted by in- service reports of cracking of the upper longeron cutout-bridge.\n\nThe original issue of this Airworthiness Directive became effective on 9 November 1995.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.png)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 13 July 2004\n\n![](image.001.png)\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 11 August 2004.\n\n  \n\nPage 1 of 1","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 revokes the original AD/EXTRA/5 and issues an updated AD that requires compliance with SB-300-3-93 Issue B and aligns with a new LBA AD in response to in‑service cracking reports. The change updates the mandated action and the ongoing compliance regime (Background; Requirement; Compliance)."},"complexity_factors":["Narrow applicability — specific models and serial numbers limit who is affected (Applicability).","Dependence on an external technical document (Extra Service Bulletin SB-300-3-93 Issue B) for the detailed work required (Requirement).","Two alternative procedures in the SB with different ongoing obligations (Procedure I: no further action; Procedure II: exchanges at ≤1,000 flight hours) increase operational decision points (Requirement; Compliance).","A firm compliance deadline tied to flight hours (before 1,000 flight hours) creates scheduling and tracking burdens (Compliance).","Revokes an earlier AD and aligns with a foreign airworthiness directive (LBA AD), so operators must follow the updated regulatory instruction (Background; Note 2).","Technical remedy (inspection/exchange of structural bridge) entails parts, labour and maintenance planning for operators (Requirement; Compliance)."],"plain_english_summary":"This AD requires owners/operators of specified Extra EA‑300 and EA‑300/S aeroplanes to carry out the work described in Extra Service Bulletin SB‑300‑3‑93 Issue B to address cracking of the upper longeron cutout bridge. Compliance is required before accumulating 1,000 flight hours; following Procedure I in the SB removes further obligations, while Procedure II requires bridge exchanges at intervals not exceeding 1,000 hours. (Requirement; Compliance)  \n\nCASA’s delegate issues the directive; owners/operators must arrange and pay for inspections, modifications or part exchanges to meet the hour limits. (Background; Requirement)"},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of the 1995 directive. It updates the safety order to reflect new in-service cracking reports and a revised German regulatory reference, but does not expand beyond the original purpose of addressing upper longeron cutout bridge fatigue issues in the specified Extra aircraft models."},"complexity_factors":["Single, clearly defined applicability (specific aircraft models and serial numbers)","One primary requirement referencing an external technical document (Service Bulletin)","Simple conditional logic: Procedure I = no further action; Procedure II = recurring 1,000-hour replacement","Minimal cross-references (one German AD reference in a note, one revoked AD)","No defined terms section — technical terms are either self-explanatory or reference external manufacturer documentation","Short document (1 page) with clear structure: Applicability, Requirement, Compliance, Background"],"plain_english_summary":"This CASA Airworthiness Directive replaces a prior AD and compels inspection and repair of the upper longeron cutout bridge on specified Extra EA‑300 and EA‑300/S aircraft. Owners/operators of the listed serials must follow Extra Service Bulletin SB‑300‑3‑93 and complete work before 1,000 flight hours; a more extensive repair requires 1,000‑hour replacement intervals.\n\nIt stems from fatigue‑test and in‑service cracking that could lead to structural failure if unaddressed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-extra-5-amdt-1-upper-longeron-cutout-bridge","history":"/api/acts/ad-extra-5-amdt-1-upper-longeron-cutout-bridge/history","analysis":"/api/acts/ad-extra-5-amdt-1-upper-longeron-cutout-bridge/analysis","conflicts":"/api/acts/ad-extra-5-amdt-1-upper-longeron-cutout-bridge/conflicts","importantCases":"/api/acts/ad-extra-5-amdt-1-upper-longeron-cutout-bridge/important-cases","documents":"/api/acts/ad-extra-5-amdt-1-upper-longeron-cutout-bridge/documents"}}