Maintenance and Modifications
Sierra earns FJ44 approval for Citations
Citation modification specialist Sierra Industries of Uvalde, Texas, has received an STC for its Stallion conversion, a Citation 500/501 powered by William

Citation modification specialist Sierra Industries of Uvalde, Texas, has received an STC for its Stallion conversion, a Citation 500/501 powered by Williams FJ44-2A turbofans in place of the twinjet’s original Pratt & Whitney Canada JT15Ds.
Sierra CEO Mark Huffstutler said the Stallion will climb directly to FL430 “at any weight or temperature and cruise at 380 knots on 620 pounds per hour of fuel for more than 1,400 nautical miles.”

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