Beechcraft King Air 200 — Service Bulletins

This Airworthiness Bulletin addresses issues related to engine fire detection systems in Beechcraft B200 series aircraft. It aims to inform operators and maintainers about the problems associated with the existing optical flame detectors, which have been known to give false in-flight fire indications. The bulletin discusses the background of these issues, including the potential causes of false alarms and the recommended solutions. It emphasizes the importance of upgrading to continuous loop fire detection systems to enhance reliability and safety. The bulletin also references previous service instructions and bulletins that provide further guidance on the installation of improved fire detection systems.

• The bulletin applies to all Beech 200 King Air Series aircraft without continuous loop fire detection systems.
• Operators have reported false in-flight fire indications due to optical flame detectors.
• The recommended solution is to install continuous loop engine fire detection systems.
• CASA strongly advises upgrading to avoid false alarms.
• Optical flame detectors are becoming unavailable due to regulatory changes regarding Cadmium Sulphide.