Pratt & Whitney's F100-PW-229 engine, used to power the Boeing F-15E and Lockheed Martin F-16C/D fighters, has reached the 500,000-hr flight time milestone. The air forces of Israel, Korea, Saudi Arabia, Singapore and the U.S. operate the F100-PW-229. Greece has selected it for the 50 F-16s it has on order. Based on U.S. Air Force data, the -229 is the safest engine for single-engine fighters in the service's history. A 29,100 lbs thrust augmented turbofan, the -229 has been flying for nine years and has undergone several upgrades. Current versions include a fifth generation digital electronic engine control as well as new cooling technologies, materials and coatings, according to the Hartford, Connecticut based manufacturer. Scheduled overhauls are performed by Pratt & Whitney San Antonio. Spare engine availability has been above target for the USAF fleet for more than a year, Pratt says.