{"id":"F2006B08810","name":"AD/DC3/34 Amdt 1 - Aircraft Flight Manual, Flight into Icing Conditions","slug":"ad-dc3-34-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":52188,"registerId":"commonwealth-F2006B08810-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 revokes Airworthiness Directive (AD) AD/DC3/34 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/DC3/34","sectionType":"part","heading":"AD/DC3/34","content":"# AD/DC3/34\n\n## Amdt 1\n\nApplicability: All models DC3. Requirement: Revise:\n\n  \n\n## Aircraft Flight Manual, Flight into Icing Conditions\n\n  \n7/2000","sortOrder":1},{"sectionNumber":"Amdt 1","sectionType":"part","heading":"Amdt 1","content":"## Amdt 1\n\nApplicability: All models DC3. Requirement: Revise:","sortOrder":2},{"sectionNumber":"Aircraft Flight Manual, Flight into Icin","sectionType":"part","heading":"Aircraft Flight Manual, Flight into Icing Conditions","content":"## Aircraft Flight Manual, Flight into Icing Conditions\n\n  \n7/2000","sortOrder":3},{"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":4},{"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":5},{"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":6}],"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":3,"scope_assessment":{"changed":false,"description":"The instrument revokes the prior AD and issues Amendment 1 requiring revision of the AFM for all DC‑3 models. Based on the supplied text, applicability remains \"All models DC3\" and the requirement remains to revise the AFM; there is no visible expansion of affected aircraft types or new technical mandates in the provided excerpt. Formatting duplication in the text may complicate interpretation but does not, from the text given, alter substantive scope."},"complexity_factors":["Applicability stated as \"All models DC3\" — broad, single-type coverage simplifies scope.","Action limited to revising the Aircraft Flight Manual (administrative change) rather than hardware modification.","Operational content relies on subjective visual cues (e.g. \"unusually extensive ice accumulation\"), increasing pilot judgment calls.","Procedural requirements (request ATC priority, route/altitude changes, monitor ambient temperature) create operational decisions for flightcrew.","Compliance timing not specified in the excerpt provided — potential ambiguity about when revisions must be completed.","Document contains duplicated headings and formatting irregularities, raising interpretive burden for implementers.","Legal basis explicitly invoked: subregulation 39.1(1) of CAR 1998 — enforcement and regulatory consequence clear.","Implementation imposes modest administrative and training costs on operators to update manuals and brief crews."],"plain_english_summary":"This Airworthiness Directive for all DC‑3 models revokes the prior AD and requires operators to revise the Aircraft Flight Manual section on \"Flight into Icing Conditions.\" The manual must add a warning about severe icing in freezing rain/drizzle or mixed conditions, list visual cues of severe icing, and set procedures to exit such conditions (including requesting ATC priority and monitoring ambient temperature). It affects DC‑3 owners, operators and flightcrew, who must update manuals and follow the new procedures under CAR 1998 s.39.1(1)."},"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 flight manual revisions for DC-3 icing procedures — consistent with the original AD's purpose of addressing unsafe icing conditions in this specific aircraft type. No scope creep detected."},"complexity_factors":["Very short document (approximately 400 words)","No defined terms section — all language is plain operational English","No cross-references to other legislation or regulations beyond a single mention of CAR 1998 subregulation 39.1(1)","Simple structure: applicability → requirement → warning → procedures","Single condition (applies to all DC-3 models) with no nested exceptions or conditional logic","Operational content only — no technical compliance calculations, timelines, or phased implementation"],"plain_english_summary":"This Airworthiness Directive requires all DC‑3 operators in Australia to revise their Aircraft Flight Manual with new warnings and emergency procedures for flying in icing conditions. It alerts crews that the vintage DC‑3 can encounter severe icing in conditions like freezing rain, mixed ice crystals, or visible rain below 0°C.\n\nPilots must watch for unusual ice accumulation (windscreen, aft of protected wing areas, engine cowlings), monitor outside air temperature, and seek priority ATC help to change altitude or route to escape icing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dc3-34-amdt-1-aircraft-flight-manual-flight-into-icing-conditions","history":"/api/acts/ad-dc3-34-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/history","analysis":"/api/acts/ad-dc3-34-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/analysis","conflicts":"/api/acts/ad-dc3-34-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/conflicts","importantCases":"/api/acts/ad-dc3-34-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/important-cases","documents":"/api/acts/ad-dc3-34-amdt-1-aircraft-flight-manual-flight-into-icing-conditions/documents"}}