Abstract
BRISTOW Helicopters has now recorded over 15,000 operational AS332L Bristow Tiger and Sikorsky S‐61N flying hours with its combined Cockpit Voice and Flight Data Recorder (CVFDR). Developed in conjunction with GEC‐Plessey Avionics as part of an Integrated Health and Usage Monitoring System (IHUMS), the system received United Kingdom Civil Aviation Authority approval in December 1991, well in advance of regulations requiring its installation in all UK registered public transport helicopters by 31 July 1992.
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