Jet Aviation facilities in Geneva, Singapore, Teterboro, N.J., and West Palm Beach, Fla., have been appointed as authorized installation centers for Quiet Technology Aerospace’s hush kits in the Gulfstream II, IIB and III. The hush kits lower the aircraft’s noise signature below Stage 3 limits, weigh 234 pounds and require no modifications to the thrust reversers. Miami-based Quiet Technologies is scheduled to appoint London-based Harrods Aviation (formerly Metro Business Aviation) as another authorized hush-kit facility. Installed price is about $1.65 million and downtime is 10 days maximum.