Geoff Thomas
One of the 'big three' engine builders - GE - is testing an enchanced GE90 for the Boeing 777 with new technologies to increase its on-wing life, fuel burn and thrust.
Known at the performance improvement programme (PIP), it will provide the GE90 with an exhaust gas temperature (EGT) margin enhancement of up to 20í C, a fuel burn reduction of around 1.7% and the capability to boost thrust up to 93,000lb (41,000Kn).
These performance improvements are being achieved through advanced 3-D aerodynamic design in the compressor and optimal rotor-to-stator clearances in the fan and turbines.
Later this year, the enhanced GE90 engine will operate on the company's 747 flying testbed aircraft at Mojave, California, and FAA certification is expected in December 1999.
Boeing 777 aircraft powered by the GE90 PIP engine are targeted for delivery beginning in mid-2000.
Just under a third of all 777 aircraft currently in service and on order are powered by GE90 engines but that rises to 42% of the newer 777-200ER.
Source: Flight Daily News
