{"id":"F2006B05991","name":"AD/PA-42/24 Amdt 1 - Aircraft Flight Manual, Flight into Icing Conditions","slug":"ad-pa-42-24-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":136211,"registerId":"commonwealth-F2006B05991-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-42/24 Amdt 1 - Aircraft Flight Manual, Flight into Icing Conditions","content":"![](image.001.png)  \n![](image.002.png)  \nPiper PA-42 (Cheyenne III) Series Aeroplanes\n\nAIRWORTHINESS 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-42/24 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.\n\nAD/PA-42/24\n\nAmdt 1\n\n  \nAircraft Flight Manual, Flight into Icing Conditions 7/2000\n\nApplicability: PA42, PA42-720 and PA42-1000, all serial numbers. Requirement: Revise:\n\n    The Limitations Section of the aircraft's Aircraft Flight Manual (AFM) by incorporating the following:\n\n\"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.\n\nSince the auto-pilot, when installed and operating, may mask tactile cues that indicate adverse changes in handling characteristics, use of the auto-pilot is prohibited when any of the visual cues specified above exist, or when unusual lateral trim requirements or auto-pilot trim warnings are encountered while the aircraft is in icing conditions.\n\nAll wing icing inspection lights must be operative prior to flight into known or forecast icing conditions at night. This direction supersedes any relief provided by any Minimum Equipment List.\n\n    2. The Normal Procedures Section of the AFM by incorporating the following:\n\nTHE 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.\n\nPROCEDURES 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.\n\nIf the visual cues which are specified in the Limitations Section of the AFM for identifying severe icing conditions are observed, accomplish the following:\n\n    Immediately request priority handling from Air Traffic Control to facilitate a route or an altitude change to exit the severe icing conditions in order to avoid extended exposure to flight conditions more severe than those for which the aircraft has been certificated.\n\n    Avoid abrupt and excessive manoeuvring that may exacerbate control difficulties.\n\n    Do not engage the autopilot.\n    If the autopilot had previously been engaged, hold the control wheel firmly and disengage the autopilot.\n\n    If an unusual roll response or un-commanded roll control movement is observed, reduce the angle-of-attack.\n\n    Do not extend flaps when holding in icing conditions. Operation with flaps extended can result in a reduced wing angle-of-attack, with the possibility of ice forming on the upper surface further aft on the wing than normal, possibly aft of the protected area.\n\n    If the flaps are extended, do not retract them until the airframe is clear of ice.\n    Report these weather conditions to Air Traffic Control.\n\nNote 1: Certificate of Registration holders should initiate action to ensure notification of this change is conveyed to any person who may operate their aircraft as pilot in command.\n\nNote 2: FAA AD 99-14-01 refers.\n\nCertification for accomplishment of this Directive may be carried out:\n\n    after a copy of this Directive is included in the appropriate sections of the aircraft's AFM; and\n\n    b. may be carried out at a minimum, by the holder of a private pilot's licence.\n\nCompliance: Within 30 days after the Effective date of this Amendment.\n\nThis Amendment becomes effective on 13 July 2000.\n\nBackground: This Directive is issued to minimise the potential hazards associated with operating the aircraft in severe icing conditions by providing more clearly defined procedures and limitations associated with such conditions.\n\nAmendment 1 is issued to correct a word processing error in the initial issue.\n\nThe original issue of this Airworthiness Directive became effective on 23 March 2000.\n\n![Signature of Bernard Malcolm Hole, Delegate of the Civil Aviation Safety Authority.](image.003.png)  \n\nBernard Malcolm Hole\n\nDelegate of the Civil Aviation Safety Authority 31 May 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 14 June 2000.","sortOrder":0}],"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"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Amendment 1 corrects a word-processing error in the original AD; it does not alter the substantive requirements. The AD continues to require AFM revisions and the same limitations and procedures for severe icing that were in the initial issue (original AD effective 23 March 2000; this Amendment effective 13 July 2000)."},"complexity_factors":["Mandatory AFM revision within a short compliance window (30 days) imposes administrative burden on certificate holders.","Applies to all serial numbers of PA42/PA42-720/PA42-1000 — broad fleet coverage increases operational impact.","Operational prescriptions include prohibiting autopilot when specified visual cues exist and forbidding flap extension in icing, which change pilot behaviour and in-flight handling.","Requirement that all wing icing inspection lights be operative for night flight into known/forecast icing and that this supersedes any MEL relief creates equipment-readiness and maintenance implications.","Identification of 'severe icing' relies on subjective visual cues (ice location/extent), creating potential ambiguity in pilot decision-making and ATC interaction for priority handling.","Unusual certification route: compliance may be certified after inserting the Directive into the AFM and can be done by a private pilot — enables low-cost compliance verification but raises record-keeping considerations.","Interaction with Air Traffic Control (requesting priority handling) introduces coordination and operational trade-offs.","Amendment noted as a correction to a word-processing error — low substantive change but requires re-issuance and notification procedures."],"plain_english_summary":"Mandates that owners/operators of Piper PA‑42 (Cheyenne III) series aeroplanes amend the Aircraft Flight Manual within 30 days to add specific severe-icing limitations, visual cues and required procedures (including autopilot restrictions, flap guidance and wing-icing inspection-light requirements). It affects certificate holders, pilots and maintenance personnel who must update manuals, ensure equipment operability and change in-flight decision-making. CASA states the change aims to reduce hazards from severe icing; mechanically this imposes administrative updates, possible training, altered operational choices and ongoing compliance costs."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of AD/PA-42/24. Amendment 1 was issued solely to correct a word processing error in the initial issue; it does not expand applicability, add new requirements, or alter the substantive safety measures. The directive remains focused on the specific safety issue of severe icing procedures for the PA-42 series aircraft."},"complexity_factors":["Single specific aircraft type and model series (PA-42 variants) with clear applicability","Straightforward two-part requirement: insert specific text into two sections of the Aircraft Flight Manual","Minimal defined terms (only standard aviation terminology like 'AFM', 'angle-of-attack')","Simple compliance mechanism (manual revision plus certification by private pilot or higher)","No nested exceptions or conditional logic beyond the basic applicability criteria","Clear single deadline (30 days from effective date)","Background section provides plain English rationale without legal cross-referencing"],"plain_english_summary":"Owners and operators of Piper Cheyenne PA‑42 series aircraft must revise the Aircraft Flight Manual to add warnings and escape procedures for severe icing. The update warns that ice can form beyond certified protections and on engine and windscreen surfaces, and prescribes actions to recognise and escape severe icing conditions.\n\nThis affects all PA‑42, PA‑42‑720, and PA‑42‑1000 aircraft; the amendment must be incorporated within 30 days of the 13 July 2000 effective date."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-42-24-amdt-1-aircraft-flight-manual-flight-into-icing-conditions","history":"/api/acts/ad-pa-42-24-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/history","analysis":"/api/acts/ad-pa-42-24-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/analysis","conflicts":"/api/acts/ad-pa-42-24-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/conflicts","importantCases":"/api/acts/ad-pa-42-24-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/important-cases","documents":"/api/acts/ad-pa-42-24-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/documents"}}