Editing Tupolev Tu-144 (section)

===Cabin noise===
A problem for passengers was the very high noise level inside the cabin, measuring at least 90–95&nbsp;dB on average.<!-- decibel level obtained from NASA engineer in person --> The noise came from the engines; unlike Concorde, it could only sustain supersonic speeds using afterburners continuously. In addition, the active heat insulation system used for the air conditioning, which used the flow of spent cabin air, was described as excessively noisy. Passengers seated next to each other could have a conversation only with difficulty, and those seated two seats apart could not hear each other even when screaming and had to pass hand-written notes instead. Noise in the rear of the cabin was described as unbearable.{{sfn|Moon|1989|p=195}}{{#tag:ref|See contemporary passenger reports about the noise problem<ref name="Soviet Union 1977">{{cite magazine |url=https://content.time.com/time/subscriber/article/0,33009,912014,00.html |title=Soviet Union: Christening the Concordski |magazine=[[Time (magazine)|Time]] |date=14 November 1977 |archive-url=https://web.archive.org/web/20211110085315/http://content.time.com/time/subscriber/article/0,33009,912014,00.html |archive-date=10 November 2021 |url-status=live}}</ref><ref>{{cite news|title=Soviet supersonic jet goes into service |newspaper=The Times |location=London|date=2 November 1977}}</ref>{{page needed|date=December 2021}}<ref name="wapo-19771102">{{cite news |title=Soviets Launch SST Flights With Cognac, Caviar |newspaper=[[The Washington Post]] |date=2 November 1977}}</ref><ref>{{citation |url=https://www.nytimes.com/1977/11/02/archives/soviet-sst-takes-off-in-moscow-and-you-almost-hear-it-in-queens.html |title=Soviet SST Takes Off in Moscow – And You Almost Hear it in Queens |archive-url=https://web.archive.org/web/20211110085319/https://www.nytimes.com/1977/11/02/archives/soviet-sst-takes-off-in-moscow-and-you-almost-hear-it-in-queens.html |archive-date=10 November 2021 |newspaper=[[New York Times]] |date= 2 November 1977}}</ref><ref name="TU144 Cabin Noise">{{cite web |url=http://www.oboguev.net/misc/tu144-cabin-noise.htm |title=Cabin noise |archive-url=https://web.archive.org/web/20110723231451/http://www.oboguev.net/misc/tu144-cabin-noise.htm |archive-date=23 July 2011 |website=oboguev.net |access-date=25 January 2011 |url-status=live}}</ref>|group=N}}