A former executive for Rockwell International Corp. has pleaded guilty to charges that he schemed to double-bill the Air Force by nearly $450,000 on contracts for a satellite navigational system.

In an agreement with prosecutors, Robert Zavodnick, a former manager of major subcontracts at Rockwell, entered the plea Monday to one count of conspiracy and one count of making false statements, said Assistant U.S. Attorney George B. Newhouse Jr.U.S. District Judge Consuelo Marshall denied motions to dismiss the conspiracy count and a count of criminal contempt on the part of Rockwell, said Mary McMenimen, a spokeswoman for the prosecutor's office.