The Boeing Co., Ridley Park, Pa., was awarded a $174,104,000 firm-fixed-price contract.  The purpose of this contract modification is to award the CH-47F multiyear contract for the fourth year production lot nine option of eight CH-47F new build cargo helicopters.  Work will be performed in Ridley Park, Pa., with an estimated completion date of Dec. 30, 2013.  One bid was solicited with one bid received.  U.S. Army Contracting Command, Contracting Center Aviation and Missile, Redstone Arsenal, Ala., is the contracting activity (W58RGZ-08-C-0098).