1902 - 120th Place SE #202
Everett, Washington, 98208
Phone: (425)
337-9472 or toll free (888) 300-5443; Fax: (425) 337-9578
AIRCRAFT NOISE CERTIFICATION
TESTING OVERVIEW
Certifying the noise for an aircraft involves evaluating the Effective Perceived Noise Level (EPNL) at given
reference points for Takeoff, Sideline and Landing. The noise limits are based on the takeoff gross weight and
number of engines.
Noise Certification Requirements:
Noise Evaluation Points (click to see schematic)
Takeoff
Sideline
Landing
Noise Limits for Each (click to see limits)
Effective Perceived Noise Level (EPNL)
Increase with Takeoff Gross Weight (TOGW)
Reference Conditions
Sea Level ISA + 10° C