NASA's Armstrong Flight Research
Center (AFRC) in California has a requirement for repair of two Pratt
& Whitney JT9D-7 engines which have been removed from the
aircraft and preserved with Mobil AVREX M-Turbo gas turbine
lubricant.
Located at AFRC, the engines (serial
number P662676 and P662412) were removed from NASA's Stratospheric
Observatory for Infrared Astronomy (SOFIA) aircraft (tail number
N747NA) in August 2014. The engines currently have turbine
exhaust case cracks.
SOFIA is the largest airborne observatory in the world, capable of
making observations that are impossible for even the largest and highest
ground-based telescopes.SOFIA is an 80/20 partnership of NASA and the German Aerospace Center, consisting of an extensively modified Boeing 747SP aircraft carrying a reflecting telescope with an effective diameter of 2.5 meters (100 inches).
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