Dallas Airmotive displayed a Gulfstream II fitted with a mock-up of Stage III Technologies' Rolls-Royce Spey Stage 3 hushkit at the NBAA. Flight-testing of the ejector hushkit is to begin in June 1998, leading to certification late in 1998. Ground tests show that the hushkit will meet or exceed Stage 3 requirements, says Dallas Airmotive, which will install the units.
Source: Flight International