{"id":"F2006B09601","name":"AD/EXTRA/2 - Wing Root Rib and Auxiliary Spar Attachment","slug":"ad-extra-2-wing-root-rib-and-auxiliary-spar-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54332,"registerId":"commonwealth-F2006B09601-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/EXTRA/2 - Wing Root Rib and Auxiliary Spar Attachment","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nExtra EA-300 Series Aeroplanes\n\nAD/EXTRA/2 Wing Root Rib and Auxiliary Spar Attachment 5/95\n\nApplicability: All Models.\n\nRequirement: Visually inspect, using a borescope, the wing root rib and auxiliary spar for cracking. Inspect for delamination between the upper and lower skins and the wing root rib and auxiliary spar using the sonic or \"coin tap\" method. Inspect in accordance with Extra Service Bulletin (SB) 300-2-93, Issue B, Part I. Remove the auxiliary spar to fuselage attachment bolt. Visually inspect the fuselage auxiliary spar attachment fitting for cracks. Inspect in accordance with Extra SB 300-2-93, Issue B, Part II.\n\nNote 1: German LBA AD 93-145 refers.\n\nCompliance: Inspect before 250 hours time in service or before 25 hours time in service after 27 April 1995, whichever occurs last. Re-inspect thereafter at intervals not exceeding 100 hours time in service.\n\nBackground: Delamination and cracking has been experienced during the fatigue test.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific structural defect identified in fatigue testing. It has not expanded beyond its original purpose of mandating inspections for wing root cracking in Extra EA-300 aircraft."},"complexity_factors":["Single, specific aircraft type (Extra EA-300 series)","Only 2 defined inspection methods (borescope visual + sonic/coin tap)","Clear, single compliance deadline with simple 'whichever occurs last' logic","No cross-references to other legislation beyond a single German authority reference (LBA AD 93-145) and manufacturer service bulletin","Straightforward recurring requirement (every 100 hours)","Total length: approximately 200 words"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for **Extra EA-300 series aeroplanes** — high-performance aerobatic aircraft.\n\n**What it requires:**\n- **Who must comply:** Owners and operators of all Extra EA-300 model aircraft\n- **What must be done:** Inspect specific parts of the aircraft's wing structure for dangerous cracks and delamination (where layers of material separate)\n- **How:** Use specialised tools including a borescope (a tiny camera on a flexible tube), sonic testing, or the \"coin tap\" method (tapping to listen for hollow sounds indicating separation)\n- **Specific parts checked:** The wing root rib (where the wing joins the fuselage), auxiliary spar (a supporting beam), and the attachment bolt and fitting that connect these to the fuselage\n\n**When it must be done:**\n- First inspection: Before the aircraft reaches 250 flight hours, OR within 25 flight hours after 27 April 1995 — whichever comes later\n- Repeat inspections: Every 100 flight hours thereafter\n\n**Why it matters:** During fatigue testing (simulating years of flight stress), these aircraft developed cracks and delamination in critical structural components. Without these inspections, the wing could fail in flight with catastrophic consequences. This directive makes the inspections legally mandatory."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"No scope change evident in the text: the AD applies to all Extra EA‑300 models and enforces inspections per Extra SB 300‑2‑93 Issue B to address delamination and cracking found in fatigue testing (Applicability; Requirement; Background)."},"complexity_factors":["Technical inspection methods required (borescope and sonic/\"coin tap\") (Requirement)","Physical disassembly: removal of the auxiliary‑spar‑to‑fuselage attachment bolt for inspection (Requirement)","Procedural reliance on Extra Service Bulletin SB 300‑2‑93, Issue B for how to inspect (Requirement)","Conditional and timed compliance thresholds (inspect before 250 hours or before 25 hours after 27 Apr 1995, whichever last) (Compliance)","Recurring inspection obligation at 100‑hour intervals (Compliance)","Applicability to all models increases the affected fleet size (Applicability)","Potential need for specialised tools/skills and repairs if cracking/delamination found (implied by Requirement and Background)","Cross‑reference to German LBA AD 93‑145 introduces international regulatory linkage (Note 1)","Operational impacts: scheduling inspections into flight hours and maintaining records (Compliance)"],"plain_english_summary":"**What it does:** Mandates inspections of the wing root rib and auxiliary‑spar attachment on all Extra EA‑300 aeroplanes for cracking and delamination using borescope and sonic/\"coin‑tap\" methods, and removal of the auxiliary‑spar‑to‑fuselage bolt to inspect the fitting (Requirement).\n\nWho pays and when: Owners/operators must carry out these inspections and any repairs before the flight‑hour thresholds set (inspect before 250 hours or before 25 hours after 27 Apr 1995, then every 100 hours) (Compliance)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-extra-2-wing-root-rib-and-auxiliary-spar-attachment","history":"/api/acts/ad-extra-2-wing-root-rib-and-auxiliary-spar-attachment/history","analysis":"/api/acts/ad-extra-2-wing-root-rib-and-auxiliary-spar-attachment/analysis","conflicts":"/api/acts/ad-extra-2-wing-root-rib-and-auxiliary-spar-attachment/conflicts","importantCases":"/api/acts/ad-extra-2-wing-root-rib-and-auxiliary-spar-attachment/important-cases","documents":"/api/acts/ad-extra-2-wing-root-rib-and-auxiliary-spar-attachment/documents"}}