{"id":"F2006B05921","name":"AD/PA-34/50 Amdt 1 - Aircraft Flight Manual, Flight into Icing Conditions","slug":"ad-pa-34-50-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":136006,"registerId":"commonwealth-F2006B05921-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/PA-34/50 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/PA-34/50","sectionType":"part","heading":"AD/PA-34/50","content":"# AD/PA-34/50\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, and/or\n\n    accumulation of ice on the engine nacelles and propeller spinners farther aft than normally observed.","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":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is an amendment (Amdt 1) to an existing Airworthiness Directive. The scope remains tightly focused on the original safety issue: preventing accidents due to flight into severe icing conditions in PA-34/50 aircraft. The amendment appears to update or clarify the warning information and procedures without expanding beyond the original safety purpose."},"complexity_factors":["Short, single-purpose document (approximately 400 words)","No defined terms section or interpretation provisions","Minimal cross-referencing (only references the regulation under which it's issued: CAR 1998 subregulation 39.1(1))","Clear, prescriptive language using bullet points and bold headings","Single compliance requirement with straightforward conditional trigger (visual cues present → immediate action required)","No nested exceptions or complex temporal provisions"],"plain_english_summary":"This CASA Airworthiness Directive warns pilots of Piper PA‑34 and PA‑50 aircraft that severe icing (e.g., freezing rain/drizzle or mixed icing) can form on unprotected surfaces or overwhelm de‑ice systems. It requires crews to monitor for visual signs of severe icing and to immediately seek priority ATC assistance to change altitude or route to escape hazardous conditions. It’s legally binding for pilots, operators and maintenance organisations because ice can critically degrade controllability."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The instrument expressly revokes the earlier AD/PA‑34/50 and issues an amended AD that adds a formal AFM warning and procedural guidance for detecting and exiting severe icing. It therefore narrows the means of compliance to the new AFM insert and specified in‑flight actions, placing obligations on operators of the affected aircraft to monitor temperatures, recognise listed visual cues and request ATC priority; timing and exact requirements are governed by the AD's requirement and compliance sections."},"complexity_factors":["Technical operational content: meteorological thresholds (temperatures, visible moisture) and aeroplane icing behaviour require pilot technical judgement.","Reliance on pilot visual cues introduces discretionary decision‑making in flight (judgement calls about 'unusually extensive ice', etc.).","Cross‑references to the AD's 'requirement' and 'compliance' sections rather than full prescriptive procedures in the text create interpretation/implementation steps for operators.","Regulatory enforcement and timing are set by the CASA delegate, centralising administrative discretion.","Operational impact: updates to the Aircraft Flight Manual, pilot briefing/training and possible ATC coordination impose costs on operators."],"plain_english_summary":"This Airworthiness Directive replaces the prior AD for PA‑34/50 aircraft and requires operators to insert a new Aircraft Flight Manual warning and follow specified procedures for recognising and exiting severe in‑flight icing. The CASA delegate sets the required actions and timing (see the AD’s requirement and compliance sections). Operators must monitor ambient temperature, watch for the listed visual cues of severe icing, and, if those cues occur, seek priority handling from Air Traffic Control to change route or altitude. Operators bear the cost and discipline of compliance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-34-50-amdt-1-aircraft-flight-manual-flight-into-icing-conditions","history":"/api/acts/ad-pa-34-50-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/history","analysis":"/api/acts/ad-pa-34-50-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/analysis","conflicts":"/api/acts/ad-pa-34-50-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/conflicts","importantCases":"/api/acts/ad-pa-34-50-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/important-cases","documents":"/api/acts/ad-pa-34-50-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/documents"}}