Cessna Citation II — Airworthiness Directives

This document is an Airworthiness Directive (AD) issued by the Civil Aviation Safety Authority (CASA) of Australia for the Cessna 550 (Citation II) series aircraft. It outlines necessary actions to be taken to address safety concerns related to severe icing conditions that may affect the aircraft's performance and controllability. The directive mandates revisions to the Aircraft Flight Manual (AFM) to include warnings and procedures for pilots to follow when encountering severe icing. The AD emphasizes the importance of recognizing visual cues of icing and provides specific instructions for safe operation in such conditions. Compliance with the directive is required within 30 days of its effective date, which is 13 July 2000.

• The AD applies to Cessna 550 and 551 series aircraft equipped with pneumatic deicer boots.
• Severe icing may occur in freezing rain, freezing drizzle, or mixed icing conditions, which can exceed the aircraft's certification limits.
• Pilots must monitor visual cues for severe icing and request priority handling from ATC if observed.
• Use of autopilot is prohibited in severe icing conditions due to potential masking of handling cues.
• Compliance with the directive is required within 30 days of the effective date, 13 July 2000.