{"id":"F2006B03691","name":"AD/BEECH 200/34 - Oxygen System","slug":"ad-beech-200-34-oxygen-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43281,"registerId":"commonwealth-F2006B03691-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 200/34 - Oxygen System","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 200 (Super King Air) Series Aeroplanes\n\nAD/BEECH 200/34 Oxygen System 8/81\n\nApplicability: All models with S/Nos. BB-2, BB-6 to BB-185, BB-187 to BB-202, BB-204 to BB- 269, BB-271 to BB-407, BB-409 to BB-468, BB-470 to BB-482, BB-483 to BB-488,\n\nBB-490 to BB-509, BB-511 to BB-518, BL-1, BL-2 and BT-1 to BT-7, not modified in accordance with Beech SI No. 0867-341 Revision II.\n\nRequirement: 1. Fabricate a placard using letters at least 3 mm high to read as follows:\n\n“Flight above 25,000 feet prohibited unless the oxygen system is ARMED (ON)”.\n\n2. Install this placard in clear view of the pilot and operate the aircraft in accordance with this limitation.\n\nNote: FAA AD 80-09-03 R1 refers.\n\nCompliance: Within the next 100 hours time in service after 31 August 1981.\n\nBackground: Overseas experience has shown that this requirement is necessary to prevent seizure and binding of the oxygen control cable due to freezing of contaminating moisture which will interfere with activation of the oxygen system.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"No. The directive confines action to installation of a placard and an operational limitation for the listed serial-numbered aircraft (excluding those modified per the cited Beech service instruction). It does not broaden certification requirements or mandate hardware modification beyond the placard and the operating restriction; its stated intent is to address freezing-related seizure of the oxygen control cable by changing pilot behaviour and labelling."},"complexity_factors":["Narrow applicability: many specific serial numbers listed and an explicit exclusion for aircraft modified per Beech SI No. 0867-341 Revision II — requires operators to verify applicability.","Simple, non-technical action: fabricate and install a placard with a minimum letter size (≥3 mm) — low technical complexity and low material cost.","Operational requirement: imposes an operational limitation (no flight above 25,000 ft unless oxygen ARMED) that changes pilot behaviour and flight planning.","Short compliance window: requires action within the next 100 hours time in service after a specified date — creates scheduling/record-keeping burden.","Cross-reference: refers to FAA AD 80-09-03 R1 — may require consulting external authority for background or alignment.","Enforcement discretion: placard must be installed 'in clear view of the pilot' — placement is somewhat subjective and may invite compliance/inspection judgment calls.","Cost allocation: direct costs (fabrication/installation and altered operations) fall on aircraft operators rather than regulator or manufacturer."],"plain_english_summary":"Requires operators of specified Beechcraft 200 series aeroplanes (except those modified per Beech SI No. 0867‑341 Rev II) to fit a pilot-visible placard reading “Flight above 25,000 feet prohibited unless the oxygen system is ARMED (ON)” (letters at least 3 mm) and to operate under that limitation. Compliance was required within the next 100 hours time in service after 31 August 1981. The stated purpose is to prevent oxygen-control cable seizure caused by freezing moisture; operators must install the placard and change pilot behaviour accordingly."},"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 specific aircraft. It has not expanded beyond its original purpose of preventing oxygen system failure due to freezing moisture."},"complexity_factors":["Single, specific mechanical requirement (install placard)","Limited applicability — only specific serial numbers and unmodified aircraft","No defined terms section","No cross-references to other legislation (only a note about related FAA directive)","Simple conditional logic: if aircraft is in serial number list AND not modified per SI 0867-341 Rev II, then comply","Clear, single compliance deadline (100 hours time in service after fixed date)"],"plain_english_summary":"This AD mandates owners/operators of specified Beechcraft 200 (Super King Air) aircraft (unless modified per Beech SI 0867‑341 Rev II) install a cockpit placard reading \"Flight above 25,000 feet prohibited unless the oxygen system is ARMED (ON)\" in letters at least 3 mm high and clearly visible to the pilot.  \n\nIt addresses a risk that moisture can freeze and seize the oxygen control cable, preventing oxygen activation at high altitude. Compliance is required within 100 flight hours after 31 August 1981."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-200-34-oxygen-system","history":"/api/acts/ad-beech-200-34-oxygen-system/history","analysis":"/api/acts/ad-beech-200-34-oxygen-system/analysis","conflicts":"/api/acts/ad-beech-200-34-oxygen-system/conflicts","importantCases":"/api/acts/ad-beech-200-34-oxygen-system/important-cases","documents":"/api/acts/ad-beech-200-34-oxygen-system/documents"}}