Delta Air Lines is working to moderate noise pollution from its Airbus A321ceo twinjets through an innovative engine modification. The introduction of “tooth-like chevron structures” on the exhaust nozzles of these aircraft is designed to reduce engine noise. This modification is applicable to planes powered by CFM International CFM56 engines, as announced by the company in February 2002.
CFM International shared that the “new technology includes (…) a core chevron nozzle. (…) Flight tests on the Airbus A321 are scheduled for later this year, followed by certification and entry into service in early 2003.” The goal was to enhance the aircraft’s compliance with noise regulations by decreasing perceived noise levels.
This acoustic upgrade was partly a response to stricter noise regulations, specifically FAR Stage III and CAEP 5 recommendations. “Noise and emissions have become key factors in aircraft fleet planning and operations,” explained CFM International. The adaptation ensures that the A321 model can operate within the acceptable noise limits.
Delta’s Airbus A321ceos, average 6.3 years old, are already integrating 150 next-generation A321neo aircraft as well. These jets are fitted with CFM International engines, incorporating noise-reducing chevrons to reduce decibel levels.
Delta uses its A321ceo aircraft primarily for domestic operations, offering 13,613 flights across the USA this month. This schedule is complemented by international services, including popular routes to Cancun and Montego Bay.
The airline configures these aircraft in a 191-seat, two-class layout. Cirium’s scheduling data indicates that Delta’s A321 jets serve routes such as Atlanta to New York LaGuardia, with hundreds of flights planned.
The modification to CFM56 engines helps meet regulations and responds to noise issues concerning the environment around airports, a long-standing challenge in aviation.
