This New Jet Is Quieter Than a Ferrari GT3 Speeding on a Highway

The Longitude’s cabin averaged whisper-quiet sound levels of 67 decibels.

By Danielle Cutler 19/12/2019

Tuck those noise-cancelling headphones back in your bag. If we’re
 to believe Textron Aviation, we may not need them onboard its newest jet—the Cessna Citation Longitude. To set it
 apart from the other aircraft in its super-midsize class, the company claims to have created the quietest cabin possible.

To deliver its most silent sanctuary, the jet builder performed significant R&D, from aerodynamic engineering
 to new soundproofing methods, such
 as adjusting window geometry, pane thickness and seals. There were also some surprising fixes, like using the furniture to muffle sound and the walk-in baggage compartment as a barrier to engine noise. The team’s first step was to identify exactly where noise was coming from. As you’d expect, windows and doors, as well as the fuselage, were the biggest culprits. But the heating and cooling systems,
such as cabin fans, also allowed “acoustic energy” to enter.

After isolating the sources, engineers measured, tracked and calculated noise levels via real flight data fed to computer models. The final stage was to soundproof the identified areas using dampening materials and techniques. The firm’s acoustics team then measured the noise within other aircraft in this sector using the same parameters and setup.

The Cessna Citation Longitude

Courtesy of Cessna

When the construction calmed, the Longitude’s cabin averaged sound levels of 67 decibels, similar to a luxury car speeding along a highway. According to the manufacturer, the Gulfstream G280 logged in at 69, Embraer’s Legacy 500 at about 70 and Bombardier’s Challenger 350 at about 72—all measured at cruising speed. It’s not a big variance, but it could be the difference between sleep and staring at the ceiling.

C’mon, Feel the Noise (or Not)

Cabin sound levels, in decibels, in super-midsize business jets (and a few cars for comparison).

Citation Longitude: 67 decibels
Gulfstream G280: 69 decibels
Embraer’s Legacy 500: 70 decibels
Bombardier’s Challenger 350: 72 decibels 
Commercial passenger jet: 79-84 decibels
Rolls-Royce Phantom VIII (inside cabin at 62 mph): 54 decibels
Ferrari 488 GT3 (full throttle at 50 feet away): 102 decibels

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