|Quoting Gnomon (Thread starter):|
Given that the PW4090 produces roughly the same thrust (90k lbs) as the Trents and GEs that power higher-MGTOW 772ERs, why was the PW4090 subject to the reduced MGTOW in its certification?
|Quoting Lightsaber (Reply 3):|
KE is the only operator of the pw4098 and is pissed with the higher fuel burn. While the MTOW allowed is impressive, KE bought those airframes to fly to Europe and the pw4098 fuel burn issue has really hurt the airframe economics.
|Quoting LTU932 (Reply 4):|
Isn't KE working with PW to get those engines down to PW4090 standard? I don't know in which topic it was mentioned though, but I know I read it here.
|Quoting Lightsaber (Reply 13):|
The reason for the pw4090 thrust limit is simple: Emissions. The pw4090 at 90,000lbf of thrust puts out 99.2% of the allowed ICAO NOx emissions. This is the highest certified thrust that Pratt is allowed to sell on the market. You are not allowed to fly into/out of a FAA or JAA airport without meeting ICAO emissions. In other words, the pw4090 is certified for 91,700lbf of thrust in every criteria *except* emissions. But you're not allowed to miss even one certification criteria...
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