{"id":"F2006B08102","name":"AD/CESSNA 210/53 - Oxygen Indicator Lights - Modification","slug":"ad-cessna-210-53-oxygen-indicator-lights-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115212,"registerId":"commonwealth-F2006B08102-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 210/53 - Oxygen Indicator Lights - Modification","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)  \nCessna 210 Series Aeroplanes\n\nAD/CESSNA 210/53 Oxygen Indicator Lights \\- Modification 12/81\n\nApplicability: All P210 Series with a solid state chemical oxygen system installed.\n\nRequirement: Install a press to test system in the oxygen indicator light circuits so that the indicator lights can be tested prior to each flight.\n\nCompliance: Within 200 hours time in service or before the aircraft is cleared to operate to 23,000 feet maximum altitude after additional supplementary oxygen is installed to comply with ANO 20.4\n\nBackground: The chemical oxygen system in Cessna aircraft has been reviewed by the Flying Operations Branch and additional supplementary oxygen is considered necessary to meet the requirements of ANO 20.4. The addition of the press to test system for the oxygen indicator lights is considered a satisfactory method for meeting the requirement of ANO 20.4 para. 4.1.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2440},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This appears to be the original issuance of the directive, maintaining its original scope of requiring press-to-test systems for oxygen indicators on affected Cessna P210 aircraft."},"complexity_factors":["References external regulatory instruments (ANO 20.4 and Civil Aviation Regulations Part 39)","Technical aviation terminology requiring specialized knowledge (e.g., 'solid state chemical oxygen system', 'time in service')","Alternative compliance conditions with two distinct pathways (200 hours time in service vs altitude clearance)","Specific equipment-based applicability criteria"],"plain_english_summary":"Owners/operators of Cessna P210 series aircraft with solid‑state chemical oxygen systems must modify the oxygen indicator light circuits to add a press‑to‑test function. This lets pilots verify warning lights on the ground, meeting ANO 20.4 safety requirements for oxygen supply.\n\nThe modification must be done within 200 flight hours or before the aircraft is cleared to fly above 23,000 ft, whichever comes first."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-210-53-oxygen-indicator-lights-modification","history":"/api/acts/ad-cessna-210-53-oxygen-indicator-lights-modification/history","analysis":"/api/acts/ad-cessna-210-53-oxygen-indicator-lights-modification/analysis","conflicts":"/api/acts/ad-cessna-210-53-oxygen-indicator-lights-modification/conflicts","importantCases":"/api/acts/ad-cessna-210-53-oxygen-indicator-lights-modification/important-cases","documents":"/api/acts/ad-cessna-210-53-oxygen-indicator-lights-modification/documents"}}