Robertson Aviation, LLC, Tempe, Ariz., is being awarded a $16,830,672 modification to a previously awarded firm-fixed price, indefinite-delivery/indefinite-quantity contract (N00019-08-D-0009) to exercise an option for the procurement of V-22 mission auxiliary fuel tanks, refueling kits, and accessories.  Work will be performed in Tempe, Ariz., and is expected to be completed in December 2011.  Contract funds will not expire at the end of the current fiscal year.  The Naval Air Systems Command, Patuxent River, Md., is the contracting activity.