{"id":"F2006B08429","name":"AD/CESSNA 550/23 Amdt 1 - Aircraft Flight Manual, Flight into Icing Conditions","slug":"ad-cessna-550-23-amdt-1-aircraft-flight-manual-flight-into-icing-conditions","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115909,"registerId":"commonwealth-F2006B08429-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/CESSNA 550/23 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.","sortOrder":0},{"sectionNumber":"AD/CESSNA 550/23","sectionType":"part","heading":"AD/CESSNA 550/23","content":"# AD/CESSNA 550/23\n\nAmdt 1\n\n  \n\nAircraft Flight Manual, Flight into Icing Conditions\n\n  \n7/2000","sortOrder":1},{"sectionNumber":"\"WARNING\"","sectionType":"part","heading":"\"WARNING\"","content":"# \"WARNING\"\n\nSevere icing may result from environmental conditions outside of those for which the aircraft is certificated.\n\nFlight in freezing rain, freezing drizzle, or mixed icing conditions (super cooled liquid water and ice crystals) may result in:\n\n    ice build-up on protected surfaces and exceed the capability of the ice protection system, or\n\n    ice forming aft of the protected surfaces.\n\nThis ice may not be shed using the ice protection systems, and may seriously degrade the performance and controllability of the aircraft.\n\nDuring flight, severe icing conditions that exceed those for which the aircraft is certificated shall be determined by the visual cues described below. If one or more of these visual cues exists, immediately request priority handling from Air Traffic Control to facilitate a route or an altitude change to exit the icing conditions. The cues are:\n\n    unusually extensive ice accumulation on the airframe and windscreen in areas not normally observed to collect ice, and/or\n\n    accumulation of ice on the upper surface of the wing aft of the protected area.","sortOrder":2},{"sectionNumber":"THE FOLLOWING WEATHER CONDITIONS MAY BE ","sectionType":"part","heading":"THE FOLLOWING WEATHER CONDITIONS MAY BE CONDUCIVE TO SEVERE IN-FLIGHT ICING:","content":"# THE FOLLOWING WEATHER CONDITIONS MAY BE CONDUCIVE TO SEVERE IN-FLIGHT ICING:\n\n    Visible rain at temperatures below 0 degrees Celsius ambient air temperature;\n    Droplets that splash or splatter on impact at temperatures below 0 degrees Celsius ambient air temperature.","sortOrder":3},{"sectionNumber":"PROCEDURES FOR EXITING A SEVERE ICING","sectionType":"part","heading":"PROCEDURES FOR EXITING A SEVERE ICING","content":"# PROCEDURES FOR EXITING A SEVERE ICING\n\nENVIRONMENT: (These procedures are applicable to all flight phases from take-off to landing.)\n\nMonitor the ambient air temperature.\n\nWhile severe icing may form at temperatures as cold as \\-18 degrees Celsius, increased vigilance is warranted at temperatures around freezing when visible moisture is present.","sortOrder":4}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment appears to maintain the original scope. It is Amendment 1 to an existing AD, suggesting a routine update rather than scope expansion. The content remains tightly focused on the specific unsafe condition (severe icing in Cessna 550 aircraft) and the required pilot response procedures. There is no indication the directive has expanded to cover additional aircraft types, systems, or operational phases beyond the original icing-related safety concern."},"complexity_factors":["Very short document (approximately 400 words)","No defined terms section — all language is plain operational English","No cross-references to other legislation or regulations beyond a single citation to CAR 1998 subregulation 39.1(1) (the enabling power)","Simple structure: Background/Warning → Applicability (implied: Cessna 550) → Requirements → Compliance (implied: immediate)","No conditional logic or nested exceptions — just straightforward 'if you see this, do that' instructions","Single regulatory instrument replacing one previous directive, not a complex amendment scheme"],"plain_english_summary":"This AD for Cessna 550s revokes and replaces a prior directive to strengthen required actions and procedures for encountering severe icing that can exceed the airplane’s de‑ice protection (e.g., freezing rain, mixed icing, or visible moisture below 0°C causing ice behind protected surfaces). \n\nIt requires pilots and operators to recognise visual signs of severe icing, promptly seek ATC help to change altitude/route to escape, and increase vigilance near freezing conditions—affecting owners, operators, pilots and maintenance organisations."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The instrument explicitly revokes the prior AD and issues a replacement AD that requires an Aircraft Flight Manual amendment for the Cessna 550 to add warnings, visual cues, weather-condition guidance and procedures for exiting severe icing. The replacement shifts the mandated content of the AFM and places on‑aircraft operators and pilots both the administrative duty to amend documentation and the operational duty to act in flight (per subregulation 39.1(1) of CAR 1998)."},"complexity_factors":["Regulatory change replaces an earlier AD under CAR 1998 subregulation 39.1(1), requiring operators to implement updated obligations.","Technical thresholds and meteorological references (e.g. ‘down to −18°C’, freezing rain/drizzle, mixed conditions) require operational understanding.","Reliance on subjective visual cues (unusually extensive accumulation; ice aft of protected surfaces) creates judgment calls for pilots.","Operational coordination requirement to request priority ATC handling adds an external dependency.","Compliance includes administrative action (Aircraft Flight Manual revision) plus in‑flight decision-making and possible training.","The excerpt provides procedural guidance but the AD’s compliance timing and detailed amendment text are not included here, leaving some implementation detail to the full requirement text."],"plain_english_summary":"This Airworthiness Directive revokes the previous AD for the Cessna 550 and requires updating the Aircraft Flight Manual to add specific warnings and procedures about flight into severe icing (including freezing rain, freezing drizzle and mixed conditions). It tells pilots how to recognise severe icing visually, to request priority handling from Air Traffic Control, and to take prescribed steps to exit icing; it notes severe ice can form at temperatures down to −18°C. It affects operators and pilots of the specified aircraft and requires AFM amendment and in‑flight compliance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-550-23-amdt-1-aircraft-flight-manual-flight-into-icing-conditions","history":"/api/acts/ad-cessna-550-23-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/history","analysis":"/api/acts/ad-cessna-550-23-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/analysis","conflicts":"/api/acts/ad-cessna-550-23-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/conflicts","importantCases":"/api/acts/ad-cessna-550-23-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/important-cases","documents":"/api/acts/ad-cessna-550-23-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/documents"}}