Equivalent Continuous Perceived Noise Level | ECPNL [Abbr.]

weighted equivalent continuous limited noise level | WECPNL [Abbr.]

weighted equivalent continuous perceived noise level

equivalent continuous noise level | equivalent continuous sound level | equivalent continuous sound pressure level | Equivalent Sound Level | time average sound pressure level | Leq [Abbr.]

perceived noise level

Maximum Perceived Noise Level

perceived noise level | PNL | perceived noise decibels | PNDB | sound perceived level | SPL

equivalent continuous noise level | equivalent continuous level | average sound level | Leq

equivalent continuous sound level Leq (1) | energy-equivalent continuous sound level Leq (2) [ Leq ]

(4) ‘Marginally compliant aircraft’ means civil aircraft that meet the Chapter 3 certification limits laid down in Volume 1, Part II, Chapter 3 of Annex 16 to the Convention on International Civil Aviation (Chicago Convention) by a cumulative margin of less than 10EPNdB (Effective Perceived Noise in decibels), whereby the cumulative margin is the figure expressed in EPNdB obtained by adding the individual margins (i.e. the differences between the certificated noise level and the maximum permitted noise level) at each of the three reference noise measurement points as defined in Volume 1, Part II, Chapter 4 of Annex 16 to the Chicago Conv ...[+++]ention;

(b) that the aircraft continues to meet the noise standards that applied before the change was undertaken and that are recorded in the type certificate data sheets or in a document that has been accepted by the Minister as being equivalent to a type certificate for that aircraft.

You must not continue to take a stock that is 10 per cent of its historical level and continue to fish so that it will never be any more than 10 per cent of its historical level.

In particular, the project aims at contributing to the Advisory Council for Aeronautics Research in Europe’s (ACARE) goals of reducing the perceived noise level and the weight of the engine, and cutting carbon dioxide (CO2) emissions per passenger kilometre (which means a cut in fuel consumption) as well as cutting nitrogen dioxide (NOx) emissions.