CESSNA 550 Citation II — Service Bulletins

This document is an Airworthiness Directive (AD) issued by the Civil Aviation Safety Authority of Australia concerning the Cessna 550 Citation II series aeroplanes. It outlines necessary actions to address safety concerns related to the wing fuel boost pumps. The directive mandates revisions to the aircraft flight manual (AFM) to prohibit the use of these pumps for defueling under specific conditions, as well as the installation of placards and detailed inspections of the fuel boost pumps. Compliance with these directives is crucial to prevent potential hazards, including fuel vapour ignition. The document is intended for operators and maintenance personnel of the Cessna 550 series aircraft.

• Revise AFM to prohibit wing fuel boost pump use for defueling under specific conditions.
• Install placard near fuel gauge with letters at least 6mm (1/4 inch) tall.
• Conduct detailed inspection for chafed wiring of wing fuel boost pumps.
• Compliance for Requirements 1 and 2 is within 25 hours TIS; Requirement 3 is within 300 flight TIS.
• Modification of wing boost pumps is required to terminate the directive.