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The QTA Hush Kit uses a unique translating
mechanism to enable integration of the acoustic system
with the existing thrust reversers, requiring no additional
controls. The ejector is mounted on two carriage assemblies,
one on each side, and slides on low-friction linear bearings.
The ejector is mechanically linked to the Thrust Reverser
System, such that when it is deployed, two "translating"
links push the ejector aft and the thrust reversers’
doors deploy. Upon stowing the thrust reversers, the ejector
is automatically pulled forward into the stow position. |
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Forward radiated fan noise is a contributor
to both take off and approach noise levels. It is also
the largest contributor to cabin noise. The high-pitched
whine of the Spey engine is tamed by the QTA Hush Kit,
which incorporates acoustic treatment to the Inlet Bullet
to reduce the sound level of the fan.
The QTA Hush Kit retains the original GulfstreamTM acoustically
treated tailpipe, the original 5 lobe mixer nozzle is
removed and replaced with a 12 lobe "fluted"
mixer nozzle. The 12 lobe nozzle works with the ejector
in promoting the mixing of the ambient air stream with
the jet exhaust. The major reduction in outside aircraft
noise levels is achieved through this mixing. |
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