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Stage III Aircrafts  
User currently offlineLahaina From United States of America, joined Sep 2000, 260 posts, RR: 0
Posted (13 years 11 months 5 days 23 hours ago) and read 1061 times:

Can someone please educate me on what Stage I, Stage II, and Stage III aircrafts are?

6 replies: All unread, jump to last
 
User currently offlineAstrojet From Germany, joined Aug 2000, 565 posts, RR: 2
Reply 1, posted (13 years 11 months 5 days 22 hours ago) and read 1035 times:

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.

rgds





User currently offlineLahaina From United States of America, joined Sep 2000, 260 posts, RR: 0
Reply 2, posted (13 years 11 months 5 days 22 hours ago) and read 1036 times:

Are stage I aircrafts all tubojets?
Stage II=early turbofans?
Stage III=high bypass ration turbofans?


User currently offlineAstrojet From Germany, joined Aug 2000, 565 posts, RR: 2
Reply 3, posted (13 years 11 months 5 days 21 hours ago) and read 1033 times:

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.

User currently offline747-451 From United States of America, joined Oct 2000, 2417 posts, RR: 6
Reply 4, posted (13 years 11 months 5 days 21 hours ago) and read 1027 times:

Stage III aircraft are also older liners like the DC-8 or 727, for instance, which have been fitted with noise supression ("hush kits")

User currently offlineTrintocan From United Kingdom, joined Apr 2000, 3238 posts, RR: 4
Reply 5, posted (13 years 11 months 5 days 21 hours ago) and read 1028 times:

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.

Trintocan.



Hop to it, fly for life!
User currently offlineOO-VEG From Netherlands, joined Oct 2000, 1081 posts, RR: 1
Reply 6, posted (13 years 11 months 5 days 17 hours ago) and read 1020 times:

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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