Stage 4 Noise Standards To Take Effect in 2006
All jet and transport-category airplanes (those with an mtow of 12,500 pounds or more) for which application of a new type design is submitted on or after Jan. 1, 2006, will have to meet new noise certification levels. The FAA today issued its final FAR Part 36 Stage 4 noise levels that were originally proposed in December 2003. Stage 4 is a cumulative 10 EPNdB (effective perceived noise level in decibels) less than the current Stage 3 limits. They are based on the work of the International Civil Aviation Organization's committee on aviation environmental protection, in which the FAA and the International Business Aviation Council are active members. All business jets currently manufactured meet Stage 3 and nearly all would qualify to be recertified to meet Stage 4. Although the proposal doesn't contain a Stage 4 retrofit requirement and the FAA said it has no plans to impose such a requirement, one of the committee's recommendations called for a phaseout by 2020 of Stage 3 airplanes with an mtow of more than 75,000 pounds. In its proposal, the FAA had noted that 25 years elapsed between the adoption of Stage 3 in 1975 and an all-Stage 3 airline fleet in December 1999. For more information, contact the FAA's Laurette Fisher at (202) 267-3561.