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Stage 4: definition & analysis of aircraft compliance, Issue 20 Dec 2001/Jan 2002

The new Stage 4 ruling is lenient compared to Stage 3 noise rules. Besides a requirement for a reduction of 10 EPNdB, only aircraft certified from 2006 are required to comply and there is no phase-out of Stage 3 aircraft. Stage 3 aircraft will be allowed to continue in operation, unaffected.

Ref number: 97