NY -- Standard&Poor's CreditWire 12/11/97 -- Standard&Poor's revised its outlook on FMC Corp.'s ratings to negative from stable. Standard&Poor's also affirmed its triple-'B' ratings on the company's senior unsecured debt and industrial revenue bonds. Additionally, Standard&Poor's affirmed its triple-'B'-minus subordinated debt rating and 'A-2' rating on the company's commercial paper 4(2) program. The outlook change reflects operating performance shortfalls in agricultural and industrial chemicals sectors. Also, financial flexibility was already somewhat constrained by high debt levels due to an active acquisition program. The company will be taking $181 million of aftertax charges in the fourth quarter relating to asset impairments and restructuring actions. However, sale of United Defense L.P. in the third