General Dynamics Land Systems will showcase a prototype prognostic and predictive maintenance, or PPMx, capability in the engine of an M1 Abrams tank at the Association of the United States Army conference next week in Washington, company executives said during an Oct. 4 interview. “The crew will know, and others will know, that my system is telling me I’ve got eight hours left, or 18 hours, whatever it is, of operations on my engine before some kind of maintenance is...