{"id":"F2006B08129","name":"AD/CESSNA 303/2 Amdt 1 - Flight Into Icing Conditions","slug":"ad-cessna-303-2-amdt-1-flight-into-icing-conditions","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115258,"registerId":"commonwealth-F2006B08129-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 303/2 Amdt 1 - Flight Into Icing Conditions","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nCessna T303 Series Aeroplanes\n\nAD/CESSNA 303/2\n\nAmdt 1\n\n  \nFlight Into Icing Conditions 8/85 DM\n\nApplicability: Model T303 with Serial Numbers T30300001 to T30300315 fitted with wing leading edge de-ice boots and propeller de-icing.\n\nRequirement: 1.a. Fabricate and install adjacent to the anti-ice system switches the following placard:\n\n\"FLIGHT INTO KNOWN ICING PROHIBITED\"\n\n1.b. Insert a copy of FAA AD No. 85-11-05 in the limitation section of the Pilot’s Operating Handbook. Copies of this AD are available from Department of Aviation, Airworthiness Offices.\n\n    2.a. Install Rudder Balance Weight Modification Kit, Part No SK303-34 in accordance with Cessna Service Bulletin MEB 85-7.\n    2.b. Remove placard and copy of FAA AD specified in Part 1 of this AD. Compliance: 1. Before further flight after 31 August 1985 until modified in accordance with\n\nRequirement 2.\n\n2. Before further flight after 30 November 1985. Background: Ice formation on the fin has been found to cause rudder flutter.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive addressing a specific safety defect in a specific aircraft model. The scope remains tightly focused on the rudder flutter/icing issue as originally intended."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined requirements with clear sub-parts (1.a, 1.b, 2.a, 2.b)","No cross-references to other legislation beyond a single FAA AD citation","Simple conditional logic: temporary measure applies 'until modified', then permanent measure removes temporary measure","Single applicability criterion (specific serial number range with specific equipment)","Plain language background explanation provided"],"plain_english_summary":"This Airworthiness Directive for Cessna T303 Crusader airplanes addresses hazardous rudder flutter caused by ice on the tail fin. It requires immediate operational limits (a warning placard and flight manual insert prohibiting flight into known icing) until a permanent rudder balance weight kit (SK303-34) is fitted. It affects owners/operators and maintenance of serials T30300001–T30300315 equipped with de‑icing. The measures prevent loss of control; temporary actions must be in place by 31 Aug 1985, and the modification by 30 Nov 1985."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive sets a temporary operational prohibition and a compulsory modification for a defined subset of T303 aircraft. The text does not indicate any change to those stated applicability or requirements from an earlier instrument; scope is limited to the serial-numbered aircraft with the specified anti-icing equipment."},"complexity_factors":["Narrow applicability by serial number and specific equipment fit (T30300001–T30300315 with wing leading edge de-ice boots and propeller de-icing) — requires checking aircraft records.","Two-step compliance regime: immediate operational restriction and documentation change, then permanent modification to remove restriction (Requirements 1 and 2).","Deadlines for interim and final compliance (before further flight after 31 Aug 1985 for placard/POH insertion; before further flight after 30 Nov 1985 for kit installation).","Mandated parts and procedures: Rudder Balance Weight Modification Kit Part No SK303-34 to be installed in accordance with Cessna Service Bulletin MEB 85-7 (technical/maintenance coordination required).","Administrative task of sourcing and inserting FAA AD No. 85-11-05 in the Pilot’s Operating Handbook and fabricating/placing the placard adjacent to anti-ice switches.","Clear causation stated (ice on the fin causes rudder flutter) reduces interpretive complexity but imposes an immediate safety-driven operational constraint."],"plain_english_summary":"This Airworthiness Directive requires operators of Cessna T303 aeroplanes (serials T30300001–T30300315) fitted with wing leading-edge de-ice boots and propeller de-icing to display a cockpit placard prohibiting flight into known icing and to insert FAA AD 85-11-05 into the Pilot’s Operating Handbook. Those restrictions remain until the Rudder Balance Weight Modification Kit (Part SK303-34) is installed, after which the placard and FAA AD copy are removed.\n\nThe AD is issued to address rudder flutter caused by ice on the fin; it creates short-term operational limits and a mandatory modification and documentation compliance obligation for affected operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-303-2-amdt-1-flight-into-icing-conditions","history":"/api/acts/ad-cessna-303-2-amdt-1-flight-into-icing-conditions/history","analysis":"/api/acts/ad-cessna-303-2-amdt-1-flight-into-icing-conditions/analysis","conflicts":"/api/acts/ad-cessna-303-2-amdt-1-flight-into-icing-conditions/conflicts","importantCases":"/api/acts/ad-cessna-303-2-amdt-1-flight-into-icing-conditions/important-cases","documents":"/api/acts/ad-cessna-303-2-amdt-1-flight-into-icing-conditions/documents"}}