Boeing has delivered to Cathay Pacific Airways the first 747-8 with the "performance improvement package" version of General Electric's GEnx-2B engines, the
The performance improvement package, called PIP by the company, also includes upgraded software for the flight management computer and activation of horizontal fuel tanks on the passenger version of aircraft.
The Cathay aircraft, a 747-8 freighter, only has the engine upgrades, but Boeing says the changes should improve the aircraft's efficiency by 1.8%.
The first 747-8 with upgraded computer software should be flying later this month and the first with an activated horizontal fuel tank should be flying in early 2014, Boeing says in a media release.
The company announced in early 2012 that it had deactivated the tail fuel system on the 747-8 Intercontinental in order to comply with US Federal Aviation
Administration regulations that don't permit flutter in any part of the airframe following certain structural failures.
During design review the company said it discovered that a failure of the wing-to-strut fitting could cause the aircraft to flutter when fuel tanks in the
horizontal stabiliser were more 15% full.
The company said at the time that it would design a fix and incorporate the fix as aircraft underwent normally scheduled maintenance.