{"id":"F2007L00474","name":"AD/EXTRA/7 Amdt 1 - Upper Longeron at Horizontal Stabiliser","slug":"ad-extra-7-amdt-1-upper-longeron-at-horizontal-stabiliser","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":63675,"registerId":"commonwealth-F2007L00474-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Extra EA-300 Series Aeroplanes","sectionType":"division","heading":"Extra EA-300 Series Aeroplanes","content":"### Extra EA-300 Series Aeroplanes\n\n| AD/EXTRA/7 Amdt 1 | Upper Longeron at Horizontal Stabiliser | 4/2007 DM |\n| ----------------- | --------------------------------------- | --------- |\n\n| Applicability: | EXTRA EA 300 models and serial numbers listed in EXTRA Service Bulletin (SB) No. 300-2-95 Issue F, or later EASA approved Issue.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with EXTRA SB No. 300-2-95 Issue F, or later EASA approved Issue.Note: EASA AD 2006-0281 refers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of 21 February 2007.For Model EA 300/S aircraft that have complied with the original issue of this Directive, no additional work is required.                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n|                | This Amendment becomes effective on 21 February 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n| Background:    | Cracks have been discovered on Model EA 300 S aircraft in front of the horizontal stabiliser attachment as well as between the attachment fittings in the upper longeron. This Directive introduces an additional pair of tubes to improve the stiffness of the fuselage cross-section underneath the stabiliser attachment.Amendment 1 is issued in response to a new EASA AD, which was prompted by the discovery of cracks on Model EA 300/L aircraft during inspections of the entire fleet of EA 300 aircraft models. Recently, following the release of Issue F of the Requirement document, cracks were detected on Model EA 300/200 aircraft. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n19 February 2007","sortOrder":0},{"sectionNumber":"AD/EXTRA/7 Amdt 1","sectionType":"part","heading":"AD/EXTRA/7 Amdt 1","content":"## AD/EXTRA/7 Amdt 1","sortOrder":1},{"sectionNumber":"Upper Longeron at Horizontal Stabiliser","sectionType":"part","heading":"Upper Longeron at Horizontal Stabiliser","content":"## Upper Longeron at Horizontal Stabiliser","sortOrder":2},{"sectionNumber":"4/2007 DM","sectionType":"part","heading":"4/2007 DM","content":"## 4/2007 DM","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose — addressing structural cracking in the upper longeron area of Extra EA-300 aircraft. Amendment 1 simply expands the affected aircraft models to include the EA 300/L and EA 300/200 variants after cracks were discovered in those types during fleet inspections. This is a natural evolution of the safety response rather than scope creep."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly referenced (the Service Bulletin)","No nested conditional logic — simple applicability test (model/serial number match)","Single compliance pathway with one explicit exemption (already-complied aircraft)","No cross-references to other legislation beyond a note about the European equivalent","Straightforward command structure: identify aircraft → follow manufacturer's bulletin → done"],"plain_english_summary":"This AD orders owners/operators of specified Extra EA‑300 series aircraft (listed serial numbers per Service Bulletin No. 300‑2‑95 Issue F) to inspect and modify the rear fuselage by adding reinforcement tubes at the horizontal stabiliser attachment. It makes the retrofit mandatory to prevent cracks found in service that could lead to tail‑attachment structural failure.\n\nAircraft already compliant with the earlier AD need no further work. The directive aligns with EASA AD 2006‑0281 and follows the manufacturer's service bulletin for timing and steps."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 1 expands the instrument in response to a new EASA AD after cracks were found in additional EA 300 models (EA 300/L and EA 300/200). It mandates the SB Issue F modification (additional tubes) for the serial numbers listed, sets a revised effective date (21 February 2007), and confirms no further work is required where the original issue was already complied with (Model EA 300/S)."},"complexity_factors":["Technical retrofit: requires installation of an additional pair of tubes to change fuselage stiffness (Background).","Applicability tied to serial numbers listed in Service Bulletin No. 300‑2‑95 Issue F or later EASA‑approved issues (Applicability).","Cross-reference to EASA AD 2006‑0281 which prompted the amendment and may require alignment with overseas regulatory findings (Requirement/Background).","Revised effective date and limited exemptions: Model EA 300/S already-compliant exemption reduces uniformity of obligations (Compliance).","Operational impacts: parts, labour, and aircraft downtime impose direct costs on owners/operators (Background/Requirement).","Dependence on Service Bulletin updates and EASA approval allows future modifications to compliance obligations (Requirement)."],"plain_english_summary":"This directive requires owners/operators of specified Extra EA‑300 series aircraft to modify the upper longeron under the horizontal stabiliser by installing an additional pair of tubes in accordance with Extra Service Bulletin No. 300‑2‑95 (Issue F or later EASA‑approved issue). CASA issued the amendment referencing EASA AD 2006‑0281 with an effective date of 21 February 2007. Aircraft owners pay for parts, labour and downtime; maintenance organisations carry out the retrofit. Model EA 300/S aircraft already compliant need no further work."}},"importantCases":[],"_links":{"self":"/api/acts/ad-extra-7-amdt-1-upper-longeron-at-horizontal-stabiliser","history":"/api/acts/ad-extra-7-amdt-1-upper-longeron-at-horizontal-stabiliser/history","analysis":"/api/acts/ad-extra-7-amdt-1-upper-longeron-at-horizontal-stabiliser/analysis","conflicts":"/api/acts/ad-extra-7-amdt-1-upper-longeron-at-horizontal-stabiliser/conflicts","importantCases":"/api/acts/ad-extra-7-amdt-1-upper-longeron-at-horizontal-stabiliser/important-cases","documents":"/api/acts/ad-extra-7-amdt-1-upper-longeron-at-horizontal-stabiliser/documents"}}