{"id":"F2006B04275","name":"AD/BEECH 90/92 - Outflow/Safety Valve","slug":"ad-beech-90-92-outflow-safety-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44081,"registerId":"commonwealth-F2006B04275-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 90/92 - Outflow/Safety Valve","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)  \nBeechcraft 90 and 65-90 (King Air) Series Aeroplanes\n\nAD/BEECH 90/92 Outflow/Safety Valve 3/98\n\nApplicability: All 65-90, A90, B90, C90 and C90A aircraft, serial number LJ-1 through LJ-1302, E90 aircraft serial number LW-1 through LW-347 and F90 aircraft, serial number LA-2 through LA-236.\n\nRequirement: Inspect and if necessary replace the outflow/safety valve in accordance with the procedures detailed in Beech SB 2484 Rev 1 dated October 1995.\n\nNo person shall install on any aircraft any Outflow/Safety Valve found to be unserviceable in accordance with this directive.\n\nNote: FAA AD 97-25-01 Amdt 39-10224 refers.\n\nCompliance: Within 200 hours’ time in service or 4 months, whichever occurs first, from the effective date of this directive.\n\nThis airworthiness directive becomes effective on the 26 February 1998.\n\nBackground: Manufacturing problems with the safety valve may cause a rapid decompression of the aircraft should a valve failure occur.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive’s scope is the set of aircraft models and serial-number ranges listed under \"Applicability\" and the single mandated action (inspect and replace the outflow/safety valve per Beech SB 2484 Rev 1). The source text contains no amendment or expansion of that scope; it sets a one-time compliance requirement with a specified deadline and a prohibition on reinstalling unserviceable valves."},"complexity_factors":["Narrow applicability defined by specific aircraft models and serial-number ranges","Single, time-limited action (inspect and replace if necessary) with a clear compliance window","External technical procedure referenced (Beech SB 2484 Rev 1) — implementers must obtain and follow that document","Absolute prohibition on reinstalling valves found unserviceable, reducing operator options","Cross-reference to a related FAA AD (informational, not a replacement for the stated requirement)"],"plain_english_summary":"What this instrument does (mechanics)\n\n- Requires a one-time inspection, and replacement if necessary, of the outflow/safety valve on specified Beechcraft 65-90/90 series aeroplanes. The inspection and any replacement must be carried out exactly as set out in Beech Service Bulletin 2484 Rev 1 (October 1995). (Requirement)\n- Prohibits installing any outflow/safety valve that is found to be unserviceable under this directive. (No person shall install...)\n- Applies only to the aircraft listed by model and serial number ranges in the directive. (Applicability)\n- Sets a firm compliance deadline: within 200 hours’ time in service or 4 months after the directive’s effective date (26 February 1998), whichever comes first. (Compliance)\n\nWho is affected\n\n- Owners and operators of the specified Beechcraft 65-90, A90, B90, C90, C90A, E90 and F90 aircraft within the serial-number ranges listed. (Applicability)\n- Maintenance organisations and technicians who must carry out the inspection and any replacement in accordance with Beech SB 2484 Rev 1. (Requirement)\n\nWhy it was issued (claimed purpose)\n\n- The directive states that manufacturing problems with the safety valve may cause a rapid decompression if a valve fails; the inspection/replacement requirement is framed as a risk-mitigation action to address that manufacturing problem. (Background)\n- The directive also notes a related FAA airworthiness directive (FAA AD 97-25-01). (Note)\n\nWho pays, who decides, and what behaviour changes\n\n- Aircraft owners/operators pay for the inspection and for any required replacement parts and labour (the directive requires the work but does not provide funding). (Requirement)\n- The Civil Aviation Safety Authority (by issuing this airworthiness directive) determines the legal obligation to comply; maintenance providers implement the work according to the referenced service bulletin. (Requirement; Beech SB reference)\n- Behaviour changes: operators must schedule the inspection within the stated timeframe; if a valve is unserviceable it must be replaced and may not be reinstalled. This can require aircraft downtime for inspection/repair and replacement of parts. (Compliance; No person shall install...)\n\nTrade-offs, compliance burden, and implementation points to note\n\n- Compliance burden: the directive imposes a short-term operational and financial obligation on each affected operator (inspection and possibly replacement); the time window is specific and relatively short (200 flight hours or 4 months). (Compliance)\n- Discretion and procedures: the directive delegates the technical procedure to Beech SB 2484 Rev 1; compliance requires following that external service bulletin exactly. That creates dependence on the availability and clarity of the service bulletin for implementers. (Requirement)\n- Supply and cost effects: the requirement to replace unserviceable valves concentrates demand for parts and qualified maintenance in a limited period; operators bear the cost and any scheduling/downtime consequences. (Requirement)\n- Restrictions on choices: the directive removes the option to reinstall an outflow/safety valve found to be unserviceable, narrowing operator choice about maintenance outcomes. (No person shall install...)\n- Cross-jurisdictional reference: the directive cites a related FAA AD; implementers may consult that AD, but the legal obligation here is to follow the Australian directive and the referenced Beech service bulletin. (Note)\n\nImplementation risk and opportunity costs\n\n- Implementation risk is principally practical: operators must obtain the correct service bulletin, competent maintenance, and any replacement parts within the short compliance window; failure to do so could require grounding or regulatory enforcement actions. (Requirement; Compliance)\n- Opportunity cost: time and money spent meeting this directive cannot be used for other maintenance or operational investments during the compliance window.\n\nSource citations\n\n- Applicability: the aircraft models and serial numbers listed under \"Applicability.\" (Applicability)\n- Action required and method: inspection and replacement in accordance with Beech SB 2484 Rev 1 dated October 1995. (Requirement)\n- Prohibition on installing unserviceable valves: \"No person shall install on any aircraft any Outflow/Safety Valve found to be unserviceable in accordance with this directive.\" (No person shall install...)\n- Compliance timeframe: \"Within 200 hours’ time in service or 4 months, whichever occurs first, from the effective date of this directive.\" (Compliance)\n- Effective date: 26 February 1998. (This airworthiness directive becomes effective on the 26 February 1998.)\n- Stated reason: manufacturing problems with the safety valve may cause rapid decompression if a valve failure occurs. (Background)\n"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This airworthiness directive maintains its original narrow scope: addressing a specific manufacturing defect in a specific aircraft component. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single, specific mechanical component addressed (outflow/safety valve)","Clear applicability criteria (specific aircraft models and serial number ranges)","Single compliance action (inspect/replace per referenced service bulletin)","Simple time-based compliance trigger (200 hours OR 4 months)","No nested exceptions, conditional logic, or extensive defined terms","Cross-reference to only one external document (FAA AD 97-25-01) and one manufacturer bulletin (Beech SB 2484)","Total length: approximately 150 words"],"plain_english_summary":"This is a **safety order for specific Beechcraft King Air aircraft**.\n\n**What it does:**\n- Requires owners and operators of certain Beechcraft 90-series planes (models 65-90, A90, B90, C90, C90A, E90, and F90 with specific serial numbers) to **inspect and potentially replace a faulty outflow/safety valve**.\n- The valve is a component that helps regulate cabin pressure. If it fails, the aircraft could experience **rapid decompression** — a dangerous loss of cabin pressure at altitude.\n\n**Who it affects:**\n- Owners and operators of approximately 1,300+ specific Beechcraft King Air aircraft (identified by serial number ranges).\n- Maintenance engineers who work on these planes.\n\n**What must be done:**\n- Follow the inspection and replacement procedures in **Beech Service Bulletin 2484 Revision 1** (October 1995).\n- Complete the work **within 200 flight hours or 4 months** of 26 February 1998, whichever comes first.\n- **Banned:** Installing any valve found to be faulty under this directive.\n\n**Why it matters:**\nManufacturing defects in these valves could cause sudden cabin pressure loss, endangering everyone on board. This directive prevents that by mandating inspection and replacement before failure occurs.\n\n**Key terms:**\n- **Airworthiness Directive (AD):** A mandatory safety order issued by aviation regulators to fix unsafe conditions in aircraft.\n- **Time in service:** Actual flight hours (not just calendar time)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-90-92-outflow-safety-valve","history":"/api/acts/ad-beech-90-92-outflow-safety-valve/history","analysis":"/api/acts/ad-beech-90-92-outflow-safety-valve/analysis","conflicts":"/api/acts/ad-beech-90-92-outflow-safety-valve/conflicts","importantCases":"/api/acts/ad-beech-90-92-outflow-safety-valve/important-cases","documents":"/api/acts/ad-beech-90-92-outflow-safety-valve/documents"}}