{"id":"F2006B04273","name":"AD/BEECH 90/90 - Leading Edge Fuel Tanks","slug":"ad-beech-90-90-leading-edge-fuel-tanks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44079,"registerId":"commonwealth-F2006B04273-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 90/90 - Leading Edge Fuel Tanks","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)  Beechcraft 90 and 65-90 (King Air) Series Aeroplanes\n\n \n\nAD/BEECH 90/90 Leading Edge Fuel Tanks 12/93\n\nApplicability: All B90, C90 and C90A aircraft S/N LJ-489 thru to LJ-1318 inclusive. Requirement:  Action in accordance with Beechcraft Mandatory Service Bulletin No 2475.\n\nNote: FAA AD 93-17-01 amdt 39-8671 refers.\n\n \n\nCompliance: Unless previously carried out within 150 hours’ time in service from 11 November 1993.\n\n \n\nBackground:  Misalignment of the fuel line resulting in cracking of the fuel cell nipples have been reported. Failure to detect and repair a damaged fuel cell nipple could result in fuel leaks and possible aircraft fire.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text of this AD sets a specific, limited scope: it applies to B90, C90 and C90A aircraft with serial numbers LJ-489 through LJ-1318 and requires action per Beechcraft Mandatory Service Bulletin No. 2475 within a stated 150‑hour window from 11 November 1993. The AD text itself does not indicate any change from that stated scope or broaden it to other aircraft or other corrective actions; therefore there is no apparent change from the scope as stated in the instrument. (See: \"Applicability\", \"Requirement\" and \"Compliance\".)"},"complexity_factors":["Narrow applicability limited to specific models and serial numbers (LJ-489 to LJ-1318) — reduces scope complexity (see: \"Applicability\").","External technical reference: compliance is defined by an external document (Beechcraft Mandatory Service Bulletin No. 2475), requiring users to consult that document for procedural detail (see: \"Requirement\").","Short, fixed compliance window tied to aircraft hours (150 hours from 11 November 1993) — adds scheduling/operational complexity (see: \"Compliance\").","Technical subject matter (fuel cell nipples and fuel line alignment) requires qualified maintenance personnel; the AD does not include the technical steps in its text (see: \"Background\" and \"Requirement\").","No alternative compliance paths or detailed administrative procedures are included in the AD text, so implementers must rely on the Service Bulletin or regulator guidance (see: \"Requirement\")."],"plain_english_summary":"This AD requires owners/operators of Beechcraft B90/C90/C90A aircraft (serials LJ‑489 through LJ‑1318) to have inspections and any repairs done per Beechcraft Mandatory Service Bulletin No. 2475, unless already completed within 150 hours’ time in service from 11 Nov 1993. It responds to reported fuel‑line misalignment that can crack fuel‑cell nipples and risk leaks or fire. Compliance imposes inspection, repair, parts, labour and downtime costs and binds acceptable means of compliance to the manufacturer’s Service Bulletin."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in defined aircraft. It has not expanded beyond its original purpose of mandating inspection and repair of leading edge fuel tank nipples."},"complexity_factors":["Single, specific applicability clause (3 aircraft models, defined serial number range)","Single mandatory action referencing an external technical document (Beechcraft Service Bulletin No. 2475)","Simple compliance deadline (150 hours time-in-service from specified date)","No defined terms section, no cross-references to other legislation beyond a note about the equivalent FAA directive","Background provided in plain language explaining the safety rationale","Total length: approximately 150 words of substantive content"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nOrders owners and operators of certain Beechcraft King Air aeroplanes (models B90, C90, and C90A with serial numbers LJ-489 through LJ-1318) to inspect and fix a dangerous fuel tank problem.\n\n**The safety issue:**\nFuel lines in the leading edge (front) fuel tanks can become misaligned, causing cracks in the fuel cell nipples (the connection points). If cracked nipples aren't found and repaired, fuel can leak out — creating a serious fire risk.\n\n**What must be done:**\nOperators must follow the instructions in **Beechcraft Mandatory Service Bulletin No. 2475** (a manufacturer-issued repair guide). This involves inspecting the fuel tank components and correcting any misalignment or damage.\n\n**When it must be done:**\nWithin 150 hours of flight time after 11 November 1993 — unless the fix was already completed before that date.\n\n**Who it affects:**\nAnyone who owns, operates, or maintains the specified Beechcraft King Air aircraft in Australia.\n\n**Why it matters:**\nThis is a **flight safety critical** order. Non-compliance means operating an aircraft with a known fire hazard, which violates civil aviation law and puts lives at risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-90-90-leading-edge-fuel-tanks","history":"/api/acts/ad-beech-90-90-leading-edge-fuel-tanks/history","analysis":"/api/acts/ad-beech-90-90-leading-edge-fuel-tanks/analysis","conflicts":"/api/acts/ad-beech-90-90-leading-edge-fuel-tanks/conflicts","importantCases":"/api/acts/ad-beech-90-90-leading-edge-fuel-tanks/important-cases","documents":"/api/acts/ad-beech-90-90-leading-edge-fuel-tanks/documents"}}