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ICAO’s Committee on Environmental Protection (CAEP), which meets every three years, held their ninth meeting in Montreal this past February. The Committee agreed to a new noise stringency standard and made progress on a CO2 emissions standard for aircraft.
Last July CAEP reached the first milestone on the CO2 emissions standard by agreeing on a metric system that can be used to measure CO2 levels. At the February CAEP meeting the certification procedures for the standard were agreed to, completing the second step in the standard-setting process. Moving forward the work will be focused on the modeling that will be used to help determine stringency levels and scope of applicability. An appropriate regulatory limit for the aircraft CO2 Standard will be determined by analyzing the ICAO criteria of technical feasibility, environmental benefit, cost effectiveness and the impacts of interdependencies.
The committee also adopted a new noise standard which is seven decibels below ICAO’s current standard. Manufacturers are happy with this decision, as it will allow for certainty as they look to incorporate the standard into design.
Realizing that a seven-decibel reduction would be more difficult to achieve for manufacturers of smaller aircraft, therefore requiring more time for compliance, the CAEP Working Group agreed on two different applicability dates. Lower weight aircraft (below 55 tons) will be subject to application of this stringency level after 2020, while larger aircraft must meet this standard by the end of 2017. The new standard must now be presented for further consideration by the ICAO Council.
Manufacturers are committed to providing increasingly more quiet and fuel-efficient aircraft. Aircraft that are entering operations today are 20 decibels quieter than comparable aircraft 40 years ago, which represents a noise reduction of 75 percent.
AIA Source: leslie.riegle[at]aia-aerospace.org