{"id":"F2006B04213","name":"AD/BEECH 90/2 - Firewall Fuel Shut-Off Valve Switches - Modification","slug":"ad-beech-90-2-firewall-fuel-shut-off-valve-switches-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43969,"registerId":"commonwealth-F2006B04213-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 90/2 - Firewall Fuel Shut-Off Valve Switches - Modification","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 90/2 Firewall Fuel Shut-Off Valve Switches - Modification\n\nApplicability: Model 65-90 and Model 65-A90 prior to S/No. LJ-152. Document:  Beechcraft SB 66-21, Rev. 1.\n\nCompliance: Forthwith.\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\n \n\n \n\n\n11/67\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2532},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains a precise, targeted scope limited to a specific technical modification on defined aircraft models. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single operative requirement with immediate compliance deadline","External technical reference to Beechcraft Service Bulletin SB 66-21","Narrow applicability limited to specific aircraft models and serial number range"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) under aviation law.\n\n**What it requires:**\n- Owners and operators of specific Beechcraft King Air aircraft must modify the fuel shut-off valve switches located on the firewall (the protective barrier between the engine and passenger cabin)\n- The modification must be carried out **immediately** (the directive uses the term \"forthwith\")\n- The technical specifications for the modification are contained in **Beechcraft Service Bulletin SB 66-21, Revision 1**\n\n**Which aircraft are affected:**\n- Beechcraft Model 65-90 and Model 65-A90\n- Only those with serial numbers **prior to LJ-152**\n\n**Why this matters:**\nAirworthiness directives are legally binding safety requirements. This modification likely addresses a risk of fuel leaks or fire hazards in the engine compartment. Non-compliance can result in the aircraft being deemed unairworthy (illegal to fly)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-90-2-firewall-fuel-shut-off-valve-switches-modification","history":"/api/acts/ad-beech-90-2-firewall-fuel-shut-off-valve-switches-modification/history","analysis":"/api/acts/ad-beech-90-2-firewall-fuel-shut-off-valve-switches-modification/analysis","conflicts":"/api/acts/ad-beech-90-2-firewall-fuel-shut-off-valve-switches-modification/conflicts","importantCases":"/api/acts/ad-beech-90-2-firewall-fuel-shut-off-valve-switches-modification/important-cases","documents":"/api/acts/ad-beech-90-2-firewall-fuel-shut-off-valve-switches-modification/documents"}}