{"id":"F2006B09827","name":"AD/F406/2 Amdt 1 - Aircraft Flight Manual, Flight into Icing Conditions","slug":"ad-f406-2-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":54799,"registerId":"commonwealth-F2006B09827-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F406/2 Amdt 1 - Aircraft Flight Manual, Flight into Icing Conditions","content":"![](image.001.png)  \n![](image.002.png)  \nReims Aviation F406 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/F406/2 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/F406/2\n\nAmdt 1\n\n  \nAircraft Flight Manual, Flight into Icing Conditions 7/2000\n\nApplicability: All F406 aeroplanes. 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\n    During 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 approved 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\nNotes:\n\n    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\n    2. DGAC AD 1998-337(A) 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 approved 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![](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":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is an amendment to correct a word processing error in the original March 2000 directive. The scope remains exactly as originally intended: to mandate flight manual updates regarding severe icing procedures for F406 aircraft. The amendment does not expand applicability, add new requirements beyond the original intent, or broaden the regulatory scope."},"complexity_factors":["Single specific aircraft type (F406 series) with clear applicability","Straightforward amendment structure: revokes old AD, issues new one with specific manual revisions","Limited cross-referencing (only mentions DGAC AD 1998-337(A) in notes, and CAR 1998 subregulation 39.1(1) in preamble)","Clear compliance deadline (30 days after effective date)","Simple certification requirements (can be done by private pilot licence holder)","Contains some aviation-specific terminology (AFM, Minimum Equipment List, CAR 1998) but these are standard industry terms","One nested structure: procedures within procedures, but logically organized","Short document (approximately 1.5 pages of substantive content)"],"plain_english_summary":"This CASA directive requires owners/operators of Reims Aviation F406 aeroplanes to amend the Aircraft Flight Manual within 30 days to add mandatory warnings and procedures for recognising and escaping severe icing (freezing rain/drizzle or mixed icing). It bans autopilot when severe‑icing cues or abnormal trim appear, requires working wing‑icing inspection lights for night icing operations, and instructs pilots to seek priority ATC to change altitude or route to escape.\n\nIt matters because severe icing can form out of protected areas, degrade handling, and cause loss of control."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Amendment 1 corrects a word‑processing error in the original AD; it does not change the substantive requirements. The directive continues to require AFM revisions, pilot notification, operational limits and procedures for severe icing, with the same applicability (all F406 aeroplanes) and the 30‑day compliance period."},"complexity_factors":["Single, focused mandatory change: revise AFM to add warnings and procedures (Requirement section).","Universal applicability but narrow fleet: affects all Reims F406 aeroplanes only (Applicability).","Operational prohibitions and actions for pilots: no autopilot when visual severe-icing cues exist; immediate ATC priority requests and specific handling steps required (Requirement: Limitations and Normal Procedures).","Equipment condition requirement: wing icing inspection lights must be operative for night flights into known/forecast icing; supersedes MEL relief (Requirement).","Short compliance window: AFM revision required within 30 days (Compliance).","Low administrative certification threshold: compliance may be certified by a holder of a private pilot's licence (Certification paragraph), reducing paperwork burden but leaving operational duties on pilots.","Background limited to safety rationale; Amendment 1 corrects a word‑processing error without substantive change (Background, Amendment 1)."],"plain_english_summary":"This AD requires operators of all Reims Aviation F406 aeroplanes to revise the Aircraft Flight Manual within 30 days to add specific severe-icing warnings, visual cues, and procedures (including immediate ATC priority requests and prohibition of autopilot when those cues exist), and to ensure wing-icing inspection lights are operative for night flights into known/forecast icing. Certificate holders must notify pilots-in-command.\n\nCASA states this aims to reduce severe-icing hazards; compliance can be certified by a private pilot, so paperwork is minimal, while pilots face operational constraints (route/altitude changes, no autopilot when cues present)."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-f406-2-amdt-1-aircraft-flight-manual-flight-into-icing-conditions","history":"/api/acts/ad-f406-2-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/history","analysis":"/api/acts/ad-f406-2-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/analysis","conflicts":"/api/acts/ad-f406-2-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/conflicts","importantCases":"/api/acts/ad-f406-2-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/important-cases","documents":"/api/acts/ad-f406-2-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/documents"}}