Stage 4 To Take Effect Next Year
All jet and transport-category airplanes for which application of a new type design is submitted on or after January 1 next year will have to meet Stage 4 noise certification levels. Stage 4 is a cumulative 10 EPNdB (effective perceived noise level in decibels) less than the current Stage 3 limits. All business jets currently manufactured meet Stage 3, and nearly all would qualify to be recertified to meet Stage 4. An International Civil Aviation Organization committee is recommending a phase-out by 2020 of Stage 3 airplanes with an mtow of more than 75,000 pounds.