Noise certification tests of an advanced hushkit for the Rolls-Royce Spey 511-8 on the Gulfstream II are due to be made at Love Field, Dallas, in early July, with US Federal Aviation Administration certification expected before October.
The new system, developed by Las Vegas-based Stage III Technologies, includes a mixer/ejector exhaust suppressor and a cascade thrust reverser. Texas-based turbine repair and overhaul specialist Dallas Airmotive has exclusive marketing rights to fit the lightweight titanium mixer and ejector, and claims that the design offers a weight saving of about 50kg (110lb) per aircraft, compared to the existing exhaust design.
The hushkit passed tests at Dallas Airmotive in May. The trials, which verified that there are no operational differences between the hushkitted Spey and the standard exhaust, cleared the way for the installation of the first production noise-suppressor system on the GII. The modified aircraft is due at Love Field around 10 June in preparation for the tests.
Source: Flight International
