Are you noticing increased noise from Boeing Field, sometimes after 10:00 pm? This press release from King County International Airport may explain why:
Residents of some adjacent airport neighborhoods may experience temporary increases in aircraft engine noise levels as described below by The Boeing Company:
Over the next several months, King County International Airport may experience elevated noise events due to The Boeing Company engine runs, a critical part of its flight testing. These flight tests are part of the certification requirements for the 787 and 747-8 programs. Both types of aircraft will be at the airport in higher than normal volumes during this time. This is an important test period where the airplanes are completing their initial configuration testing to support the certification programs.
To the extent possible these engine runs will be kept outside the curfew window between 10pm-7am daily. However, there may be a rare circumstance when The Boeing Company will need to conduct engine runs outside of curfew hours. This is most likely to happen early in the testing program and all proper protocols will be followed and notifications issued. This is necessary in order for Boeing to meet the stringent FFA requirements that allow both airplanes to be certified and put into revenue service.
For more information on flight test operations, please see the flight test fact sheet provided by The Boeing Company at http://www.kingcounty.gov/airport or contact Jennifer Hawton at The Boeing Company, (425) 444-1600.
Thanks to Steve Louie for sending us this info!