{"id":"F2005L00588","name":"AD/BEECH 99/8 - Aircraft Flight Manual - Flight Into Icing Conditions","slug":"ad-beech-99-8-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":112833,"registerId":"commonwealth-F2005L00588-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Beechcraft 99 Series Aeroplanes","sectionType":"division","heading":"Beechcraft 99 Series Aeroplanes","content":"### Beechcraft 99 Series Aeroplanes\n\n| AD/BEECH 99/8 | Aircraft Flight Manual - FlightInto Icing Conditions | 4/2005 |\n| ------------- | ---------------------------------------------------- | ------ |\n\n| Applicability: | Raytheon / Beech Aircraft Corporation (Beech) Models 99, 99A, A99A, B99 and C99 Aircraft. |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Revise the Limitations Section of the aircraft's Aircraft Flight Manual (AFM) by incorporating the following:\"WARNINGSevere icing may result from environmental conditions outside of those for which the airplane is certificated. Flight in freezing rain, freezing drizzle, or mixed icing conditions (supercooled liquid water and ice crystals) may result in ice build-up on protected surfaces exceeding the capability of the ice protection system, or may result in ice forming aft of the protected surfaces. This ice may not be shed using the ice protection systems, and may seriously degrade the performance and controllability of the airplane.During flight, severe icing conditions that exceed those for which the airplane is certificated shall be determined by the following visual cues. 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.Unusually extensive ice accreted on the airframe in areas not normally observed to collect ice.Accumulation of ice on the upper surface of the wing aft of the protected area.Accumulation of ice on the propeller spinner farther aft than normally observed.Since the autopilot may mask tactile cues that indicate adverse changes in handling characteristics, use of the autopilot is prohibited when any of the visual cues specified above exist, or when unusual lateral trim requirements or autopilot trim warnings are encountered while the airplane is in icing conditions. |\n\n| | All icing detection lights must be operative prior to flight into icing conditions at night. This supersedes any relief provided by any Minimum Equipment List \"2. Revise the Procedures Section of the aircraft’s AFM by incorporating the following:\"THE FOLLOWING WEATHER CONDITIONSMAY BE CONDUCIVE TO SEVERE IN-FLIGHT ICING:Visible rain at temperatures below 0 degrees Celsius ambient air temperature.Droplets that splash or splatter on impact at temperatures below 0 degrees Celsius ambient air temperature.PROCEDURES FOR EXITINGTHE SEVERE ICING ENVIRONMENT:These procedures are applicable to all flight phases from takeoff to landing. Monitor the ambient air temperature. While severe icing may form at temperatures as cold as -18 degrees Celsius, increased vigilance is warranted at temperatures around freezing with visible moisture present. If the visual cues specified in the Limitations Section of the AFM for identifying severe icing conditions are observed, accomplish the following: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 airplane has been certificated.Avoid abrupt and excessive manoeuvring that may exacerbate control difficulties.Do not engage the autopilot.If the autopilot is engaged, hold the control wheel firmly and disengage the autopilot.If an unusual roll response or uncommanded roll control movement is observed, reduce the angle-of-attack.Do not extend flaps during extended operation 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\n| | If the flaps are extended, do not retract them until the airframe is clear of ice.Report these weather conditions to Air Traffic Control.\"Note 1: Certificate of Registration holders should initiate action to ensure that notification of this change is conveyed to any person who may operate their aircraft as pilot in command.Note 2: FAA AD 96-09-13 Amendment 39-9589 refers.Certification for accomplishment of this Directive may be carried out:a) after a copy of this Directive is included in the appropriate sections of the aircraft's AFM; andb) may be carried out at a minimum, by the holder of a private pilot's licence. |\n| ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Compliance: | Unless already accomplished, within 30 days after the effective date of this Directive.Ensuring that the AFM revision includes the information contained in this AD meets the intent of this Directive. |\n| | This Airworthiness Directive becomes effective on 14 April 2005. |\n| Background: | This AD requires revising the AFM to provide the flight crew with recognition cues for, and procedures for exiting from, severe icing conditions, and to limit or prohibit the use of various flight control devices.The actions specified by this AD are intended to minimize the potential hazards associated with operating the airplane in freezing rain or freezing drizzle conditions by providing more clearly defined procedures and limitations associated with such conditions. |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n2 March 2005","sortOrder":0},{"sectionNumber":"AD/BEECH 99/8","sectionType":"part","heading":"AD/BEECH 99/8","content":"## AD/BEECH 99/8","sortOrder":1},{"sectionNumber":"Aircraft Flight Manual - FlightInto Icin","sectionType":"part","heading":"Aircraft Flight Manual - FlightInto Icing Conditions","content":"## Aircraft Flight Manual - Flight \nInto Icing Conditions","sortOrder":2},{"sectionNumber":"4/2005","sectionType":"part","heading":"4/2005","content":"## 4/2005","sortOrder":3}],"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":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope: mandating AFM revisions for specific Beechcraft 99 series aircraft regarding icing procedures. The content remains focused on flight crew information and operational limitations without expanding into maintenance requirements, design changes, or broader aircraft systems."},"complexity_factors":["Single, clearly defined requirement (revise AFM) with two specific sections to add","No defined terms section — uses plain aviation terminology","Minimal cross-referencing (only references FAA AD 96-09-13 in a note)","Straightforward compliance pathway (insert AD copy into manual, can be done by private pilot)","Clear applicability statement listing specific aircraft models","Some conditional logic in procedures ('if X, then Y') but presented as sequential operational steps rather than nested legal conditions","Length is moderate but content is operational/procedural rather than legislative in complexity"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Beechcraft Model 99 series to update their Aircraft Flight Manuals with warnings, recognition cues and emergency procedures for severe icing (freezing rain/drizzle and mixed icing), including autopilot restrictions and night-icing-light requirements.\n\nIt matters because severe icing can overwhelm de‑icing systems and cause loss of control; the AD aims to prevent fatal accidents by improving pilot recognition and response."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive does not expand applicability beyond the listed Beech 99-series models. It aligns with its stated purpose of adding AFM warnings and procedures for severe icing, imposing operational limits and documentation requirements without altering certification bases or introducing new equipment mandates beyond existing icing-detection light operability."},"complexity_factors":["AFM revision required and insertion into operational documentation (administrative burden on owners/operators)","Operational prohibitions and procedures (autopilot prohibition, flap restrictions) that change in-flight behaviour and decision-making","Night-time requirement that all icing detection lights be operative, superseding some MEL reliefs (interacts with maintenance/MEL policies)","Short compliance window (30 days) for implementing AFM changes","Applicability limited to specific Beech 99-series models (narrow scope but multiple stakeholder roles: owner, pilot, registrant)","Procedure includes immediate ATC priority requests and pilot recognition cues—relies on pilot judgment and training","Certification of compliance may be performed by a private pilot (low technical barrier for paperwork, but operational impact remains)"],"plain_english_summary":"Requires operators of Beech 99-series aeroplanes to revise the Aircraft Flight Manual (AFM) within 30 days to add warnings, visual cues for severe icing and procedures to exit icing, including prohibiting autopilot use when specified cues occur, restricting flap use, and requiring icing-detection lights to be operative at night. It affects aircraft owners, pilots and registrants who must update AFMs and follow new operational limits; the stated aim is to reduce hazards from freezing rain/drizzle by changing pilot behaviour and pre‑flight checks, creating modest compliance and training burdens."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-99-8-aircraft-flight-manual-flight-into-icing-conditions","history":"/api/acts/ad-beech-99-8-aircraft-flight-manual-flight-into-icing-conditions/history","analysis":"/api/acts/ad-beech-99-8-aircraft-flight-manual-flight-into-icing-conditions/analysis","conflicts":"/api/acts/ad-beech-99-8-aircraft-flight-manual-flight-into-icing-conditions/conflicts","importantCases":"/api/acts/ad-beech-99-8-aircraft-flight-manual-flight-into-icing-conditions/important-cases","documents":"/api/acts/ad-beech-99-8-aircraft-flight-manual-flight-into-icing-conditions/documents"}}