{"id":"F2006B05374","name":"AD/P68/47 - Aircraft Flight Manual, Flight into Icing Conditions","slug":"ad-p68-47-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":45954,"registerId":"commonwealth-F2006B05374-current","compilationNumber":null,"startDate":"2026-04-02","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 issues the following Airworthiness Directive (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 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.\n\n| AD/P68/47      | Aircraft Flight Manual, Flight into Icing Conditions         | 3/2000 |\n| -------------- | ------------------------------------------------------------ | ------ |\n| Applicability: | All models P68 Series, and models AP68TP-300 and AP68TP-600. |        |\n| Requirement:   | Revise:                                                      |        |\n\n    The Limitations Section of the aircraft's Aircraft Flight Manual (AFM) by incorporating the following:","sortOrder":0},{"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 lower surface of the wing aft of the protected area, and/or\n\n    accumulation of ice on the engine nacelles and propeller spinners farther aft than normally observed.","sortOrder":1},{"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":2},{"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":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive remains tightly focused on its original safety purpose: addressing a specific unsafe icing condition in specific aircraft models. The scope has not expanded beyond the original intent of mandating flight manual revisions to warn pilots about severe icing risks and escape procedures."},"complexity_factors":["Single, specific aircraft type applicability (Partenavia P68 series and two AP68TP variants)","One clear action required: revise the Aircraft Flight Manual with prescribed text","No cross-references to other legislation or regulations beyond the enabling power (CAR 1998 subreg 39.1(1))","No defined terms section — uses plain language and standard aviation terminology","Simple conditional structure: if visual cues present → take immediate action","Prescriptive compliance — exact wording provided for insertion into manual","No exceptions, exemptions, or alternative compliance methods stated"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Partenavia P68 and AP68TP aircraft to revise their Aircraft Flight Manual to add warnings and procedures for severe icing.  \n\nIt matters because freezing rain, freezing drizzle and mixed-ice can overwhelm the aircraft’s de-icing protections, creating hazardous lift and control loss; compliance is mandatory for all affected operators."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD stays within a narrowly defined original purpose: to correct an identified unsafe condition by mandating an AFM amendment about severe icing. It does not expand the regulatory reach beyond requiring the specified AFM text and pilot procedures for the listed aircraft models; it does not add airworthiness modifications, operational bans, or new certification standards."},"complexity_factors":["Single, narrowly framed requirement: mandatory AFM text revision for specified aircraft models (low legislative length).","No extensive cross-references to other regulatory Parts, but issued under subreg 39.1(1) CAR 1998 which connects to broader regulatory enforcement.","Reliance on subjective operational criteria (visual cues) increases practical complexity despite textual simplicity.","Technical content (icing conditions, temperatures, aircraft protection areas) requires operator/pilot technical understanding rather than legal parsing.","Missing explicit compliance timing in the excerpt provided (the AD mentions a compliance section elsewhere), which can create ambiguity in implementation scheduling."],"plain_english_summary":"**What this instrument does (mechanically)\n\n- This is an Airworthiness Directive (AD/P68/47) issued under subregulation 39.1(1) of the Civil Aviation Regulations 1998. It legally requires operators of the specified aircraft to amend the Aircraft Flight Manual (AFM). Specifically, the \"Limitations\" section of the AFM must be revised to include the new warning text and procedures about flight into severe icing conditions (the AD's \"Requirement\").\n\n**Who it affects\n\n- Owners, operators, and pilots of all P68 Series aircraft and the AP68TP-300 and AP68TP-600 models. Those organisations or persons who are responsible for the aircraft AFM (typically the operator or the approved entity that maintains the AFM) must make and promulgate the change.\n\n**What the new AFM material says (summary of the inserted text)\n\n- A warning that severe icing can occur outside the aircraft's certified icing envelope and that freezing rain, freezing drizzle, or mixed icing can cause ice to build up on protected surfaces or form aft of protected areas.\n- Visual cues pilots must use to recognise potentially severe icing in flight: unexpected ice accumulation on airframe/windscreen, ice on lower wing surfaces aft of protected areas, or ice on engine nacelles and propeller spinners farther aft than normal.\n- Weather indicators that are conducive to severe icing: visible rain or splashing droplets when ambient air temperature is below 0°C.\n- A basic procedural note to monitor ambient air temperature and exercise increased vigilance near 0°C, with the instruction to request priority handling from Air Traffic Control and change route/altitude immediately if severe icing is observed. The text also notes severe icing may form at temperatures as cold as -18°C.\n\n**Why the AD says it matters (stated purpose)\n\n- The AD's stated purpose is to correct an unsafe condition by ensuring pilots are warned about and have guidance for recognising and exiting icing conditions that can exceed the aircraft's certified protection (Requirement section). That is, it aims to reduce the risk of dangerous ice accumulation that could degrade performance and controllability.\n\n**How it changes behaviour and who bears costs/decisions\n\n- Who pays: The operator/owner bears the direct compliance costs — updating and distributing amended AFMs, training or briefing affected flight crew, and any operational costs caused by changed decision-making in flight (e.g. altitude/route deviations, delays). There is also the potential for indirect costs from procedural changes (flight planning, dispatch decisions).\n- Who decides: Pilots must use the specified visual cues and ambient air temperature monitoring to judge whether conditions exceed certification limits and then request ATC priority and exit the conditions. The regulator (CASA, via the delegate) decides that the AFM must be amended (AD/P68/47, subreg 39.1(1) CAR 1998).\n- Behaviour change: Operators must incorporate the warning into the AFM; pilots must apply the new visual cues and procedures in-flight, and may more frequently request deviations or priority handling to avoid icing.\n\n**Trade-offs, implementation risk and practical effects\n\n- Administrative burden: Updating an AFM, distributing the change, and briefing or training crews imposes modest administrative and training costs on operators. The AD is prescriptive about text to be included, which reduces ambiguity for compliance but does require formal amendment.\n- Operational costs: If pilots react to the new cues by changing routes/altitudes more often, there may be increased fuel use, delays, or disruption to schedules; these are borne by operators and passengers. Conversely, the guidance may prevent higher-cost incidents by avoiding loss of performance or control.\n- Subjectivity and pilot judgement: The AD relies on subjective visual cues (\"unusually extensive ice accumulation\", \"ice farther aft than normally observed\") and ambient temperature monitoring. That reliance on in-flight judgement introduces variability in pilot responses and may lead to uneven application across crews and operators.\n- Enforcement and discretion: The AD prescribes the AFM amendment; enforcement will be by the regulator. The AD does not itself set penalties but non‑compliance with an AD can lead to regulatory action. The AD leaves tactical decisions (how to exit icing) to pilots within ATC constraints, which may create tension between safety-driven deviations and operational pressures.\n- Market effects: The directive acts on a narrow group of aircraft and does not change market structure or ownership. It imposes modest compliance costs on operators but does not restrict competition or contractual freedoms beyond mandating the AFM content and consequent operational practice changes.\n\n**Summary statement\n\n- Mechanically, this AD requires operators of specified P68/AP68TP models to insert prescribed warnings and exit procedures for severe icing into the AFM. It places the compliance cost and decision-making on operators and pilots, increases reliance on in-flight visual detection and temperature monitoring, and creates potential operational costs when crews choose to exit icing conditions. (AD/P68/47; subreg 39.1(1) CAR 1998.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-p68-47-aircraft-flight-manual-flight-into-icing-conditions","history":"/api/acts/ad-p68-47-aircraft-flight-manual-flight-into-icing-conditions/history","analysis":"/api/acts/ad-p68-47-aircraft-flight-manual-flight-into-icing-conditions/analysis","conflicts":"/api/acts/ad-p68-47-aircraft-flight-manual-flight-into-icing-conditions/conflicts","importantCases":"/api/acts/ad-p68-47-aircraft-flight-manual-flight-into-icing-conditions/important-cases","documents":"/api/acts/ad-p68-47-aircraft-flight-manual-flight-into-icing-conditions/documents"}}