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BawliBooch
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Posts: 902
Joined: Mon Nov 28, 2016 4:24 am

Noise certification standards

Tue Jan 09, 2018 3:19 am

When were the Noise certification standards - Chapter 1/2/3 first codified? And what was the time frame in which it was implemented?

My understanding:
BAC 111: Chapter 1
DC9 series : Chapter 2
MD80 series : Chapter 3
MD9x series : Chapter 4

Is this correct? DC9's were serving well into the 2000's, atleast in the US. So Chapter 3/4 did not come into force in the USA? EU did enforce Chapter 3 in 2001?

I am looking for data on the timeline of implementation and scope. For eg: Did Middle Eastern countries enforce these standards and the timeline for that?

Thanks.
L' Esprit de Mai 68
 
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MD80
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Re: Noise certification standards

Tue Jan 09, 2018 4:31 am

It really depends on the different countries and it´s a very complex topic.

The MD-80 was the first aircraft in its class certificated under Chapter 3. IIRC, some countries implemented their own timelines. For example, Austria set a date in early 1988 to forbid registering civilian Chapter 2-passenger aircraft. In some European countries, the MD-80 became a loud aircraft after their main operators in these countries stopped operating them.

Regards
Dedicated for the MD-80, MD-90, MD-95 ehhh...Boeing 717, and DC-9: http://www.MD-80.com
 
MO11
Posts: 367
Joined: Sun Jan 08, 2017 5:07 pm

Re: Noise certification standards

Tue Jan 09, 2018 6:37 am

BawliBooch wrote:
When were the Noise certification standards - Chapter 1/2/3 first codified? And what was the time frame in which it was implemented?

My understanding:
BAC 111: Chapter 1
DC9 series : Chapter 2
MD80 series : Chapter 3
MD9x series : Chapter 4

Is this correct? DC9's were serving well into the 2000's, atleast in the US. So Chapter 3/4 did not come into force in the USA? EU did enforce Chapter 3 in 2001?

I am looking for data on the timeline of implementation and scope. For eg: Did Middle Eastern countries enforce these standards and the timeline for that?

Thanks.


In the US, all airplanes had to be Stage 2 by January 1, 1985. There were hush-kits developed for 707s, DC-8s, and 1-11s. Concorde was excused. Stage 3 kicked in on January 1, 2000, but there was a phase-in process beginning January 1995 (you couldn't go 0% Stage 3 to 100% Stage 3 in December 1999). The phase-in schedule was different for established carriers vs. new entrants. Airlines that were heavy on stage 3 airplanes could trade stage 3 credits to airlines that were light on stage 3 airplanes during the phase-in period. There were hush kits developed for JT8D powered airplanes, and a more expensive one for the 707. Airplanes less than 75000 pounds had to be Stage 3 by the end of 2005. There are no Stage 4 compliance rules on the books.
 
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BawliBooch
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Re: Noise certification standards

Tue Jan 09, 2018 7:28 am

MO11 wrote:
There were hush kits developed for JT8D powered airplanes, and a more expensive one for the 707.


Thanks @MO11.

Did any of the majors actually hushkit their DC9/737 fleets? I know some 727 operators did but the others?
L' Esprit de Mai 68
 
TheSonntag
Posts: 4399
Joined: Wed Jun 15, 2005 7:23 pm

Re: Noise certification standards

Tue Jan 09, 2018 8:07 am

Northwest comes to mind with their DC9.

Bear in mind there are differences between US FAA Standards like Stage 1 2 3 and ICAO chapters. Not that large but they do exist.

One Thing that killed hush kitted older planes was that the EU banned imports of hush kitted planes. So the aftermarked of hush kitted planes was Limited.

The reasoning was simple. Hush kitting planes already flying in the EU was fine. But hush kitted planes were still loud and polluting and schould not compete with planes that were already compliant at service entry.

A hush kitted 732 is still louder than a 737 classic.
 
MO11
Posts: 367
Joined: Sun Jan 08, 2017 5:07 pm

Re: Noise certification standards

Tue Jan 09, 2018 5:13 pm

BawliBooch wrote:
MO11 wrote:
There were hush kits developed for JT8D powered airplanes, and a more expensive one for the 707.


Thanks @MO11.

Did any of the majors actually hushkit their DC9/737 fleets? I know some 727 operators did but the others?


Yes, most of these airplanes were retired during the economic downturn in 2001, so they were caught in the 1995-1999 phase-in period. There were at least three different hush kits developed for the 727 (not including the RR Tay retrofit that UPS had), and maybe two for the 737 and I think only one for the DC-9. There were Stage 3 hush kits for the DC-8 (outside of the CFM retrofit) and 707, but only a handful were sold.
 
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BawliBooch
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Posts: 902
Joined: Mon Nov 28, 2016 4:24 am

Re: Noise certification standards

Wed Jan 10, 2018 1:25 am

TheSonntag wrote:
Northwest comes to mind with their DC9.

Bear in mind there are differences between US FAA Standards like Stage 1 2 3 and ICAO chapters. Not that large but they do exist.


Northwest only hushkitted the -50's right? Was it done for any of the -30 series?
L' Esprit de Mai 68

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