MD-80s are legalized by hushkits

Paris Air Show » 2005
December 13, 2006, 11:29 AM

A new Pratt & Whitney noise-reduction kit will permit operators of McDonnell Douglas MD-80 twinjets to meet Chapter 4 International Civil Aviation Organization noise rules that are scheduled for introduction in six months’ time. The heavyweight version of the equipment comprises an improved fan-inlet liner, a 16-lobe exhaust mixer, a muffler and a tabbed nozzle. A lower-cost, lightweight variant excludes one or two of these features since lighter aircraft are less noisy.

With P&W assistance, Aviation Fleet Solutions (AFS) has been conducting air and ground noise, operability and performance tests on two complete sets of equipment and three partial kits using a leased McDonnell Douglas MD-83. Some 125 hours of concept-proving and airworthiness tests were performed in more than 40 flights over a 12-month period. Certification flights took place in April and May and are being followed by further ground work ahead of formal approval. Once a supplemental type certificate is issued, production of component parts by AFS and P&W will be established to match demand.

P&W already has made the JT8D less “dirty.” An emissions-reduction package (or E-Kit) introduced in 1999 reduced NOx by a claimed 25 percent, unburned hydrocarbons by 99 percent and smoke by 52 percent, while maintaining a “low” level of carbon monoxide.

This E-Kit can be combined with the new package, which is coupled with other enhancements such as improved fan-blade containment (achieved through fitting of a forged aluminum ring in the front fan liner).

FILED UNDER: 
Share this...

Please Register

In order to leave comments you will now need to be a registered user. This change in policy is to protect our site from an increased number of spam comments. Additionally, in the near future you will be able to better manage your AIN subscriptions via this registration system. If you already have an account, click here to log in. Otherwise, click here to register.

 
X