Posts: 238
Joined: Sun Sep 03, 2000 1:51 am

Stage III Aircrafts

Sat Oct 21, 2000 11:18 am

Can someone please educate me on what Stage I, Stage II, and Stage III aircrafts are?
Posts: 553
Joined: Thu Aug 31, 2000 9:11 pm

RE: Stage III Aircrafts

Sat Oct 21, 2000 1:03 pm

This are noise regulations.
Stage I are the loudest planes like the DC 8-30 or the Trident and I believe they had to quit operations on January 1st 1986.
Stage II are planes like DC 9-30 or B 737-200 and they have to quit on January 1st 2002.
Stage III are the silent planes like the B737-300 and up or A 320.
I still remember in the seventies, when I was a kid and went close to the runway to see those stage I planes take off, that was noisy! even the ground was shaking like a small earthquake! and then the black smoke. Things we never gonna see again.


Posts: 238
Joined: Sun Sep 03, 2000 1:51 am


Sat Oct 21, 2000 1:10 pm

Are stage I aircrafts all tubojets?
Stage II=early turbofans?
Stage III=high bypass ration turbofans?
Posts: 553
Joined: Thu Aug 31, 2000 9:11 pm

RE: Stage III Aircrafts

Sat Oct 21, 2000 1:21 pm

Well , the regulation only cares about the noise in db. (I don´t know if in english you write decibels), but it may fit pretty good to that categories of engines.
Posts: 2327
Joined: Wed Oct 04, 2000 5:50 am

RE: Stage III Aircrafts

Sat Oct 21, 2000 1:38 pm

Stage III aircraft are also older liners like the DC-8 or 727, for instance, which have been fitted with noise supression ("hush kits")
Posts: 2728
Joined: Sun Apr 23, 2000 6:02 pm

RE: Stage III Aircrafts

Sat Oct 21, 2000 1:39 pm

Lahaina you are generally correct about the noise levels of the different categories of jet engines fitted to airliners. Older planes such as Stage I or II types are only able to continue in service by being modified to reduce noise levels. This can be done by fitting hushkits to the engines or putting on new engines altogether. For instance, many 727s are hushkitted while others have had JT8D-217A/C engines (as on MD80s) fitted on the outboard pylons. Hushkits reduce the power of the engines, though, so that in the case of some 727s winglets have been added to improve performance.

As Astrojets said, though, even hushkitted planes will eventually have to be retired. Concorde is (was) the only exception - it has an ICAO waiver which permits its continued service despite its extremely high noise levels. That is because it cannot not fly at supersonic speeds if hushkitted and, in any case, kitting it is not practical. The small numbers of them in service may also have been considered.

Hop to it, fly for life!
Posts: 1246
Joined: Mon Oct 02, 2000 5:31 pm

RE: Stage III Aircrafts

Sat Oct 21, 2000 5:58 pm

Nowadays every new (civil) aircraft is stage III, so will there be a stage IV sometime (or is there already a stage 4)??? That would be very handy for lots of airports who struggle with noise regulations.

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