Managers at KABC are expected to start training sessions today to take over technical duties at the station in the event that current contract negotiations stall and NABET calls for a strike, sources said.Contract negotiations have hit a rocky point between the National Assn. of Broadcast Employees & Technicians and Capital Cities/ABC, as the web has asked the union to consider lowering its pension contributions from 9.5% of base earnings to 5%. The company is also seeking to change the union’s senority system. Both sides are currently meeting in Florida and will continue to do so until March 11. NABET will then hold a special membership meeting on March 20, at which time it will call for a strike vote, thus allowing the negotiators to call for a strike if talks break down. Talks are skedded to continue in New York from March 22 through April 2.