ICAO Journal

No. 2

Pratt & Whitney's newly announced PW4000 engine series will be similar in external appearances to this JT9D-7R4. Inside, however, the two engines are radically different. The PW4000 will have 54 per cent fewer parts than the JT9D. In addition, the PW4000 is expected to provide fuel-consumption improvements that are seven per cent better than the JT9D-7R4. Savings to airlines could be about US$1 million a year in fuel costs alone for every four engines, according to company estimates.