Former CIA employe Frank E. Terpil of McLean and the president of a California-based explosives firm pleaded innocent yesterday to conspiracy charges in connection with the alleged operation of a training school for terrorists in Libya.

Terpil, 40, and Jerome S. Brower, 60, also denied charges that they had violated various federal laws involving overseas transportation of explosives.

Terpil also pleaded innocent in U.S. District Court to charges that he and Edwin P. Wilson, of Upperville, Va., a former CIA operative, recruited an American citizen to assassinate a Libyan expatriate in 1976 for a $1 million fee. The alleged scheme was never carried out.

A bench warrant has been issued for Wilson, who was also charged in a grand jury indictment last week with conspiracy and explosives violations. Assistant U.S. Attorney E. Lawrence Barcella Jr. said in court yesterday that Wilson was last believed to be in Libya and that he is not expected to voluntarily return to the United States.

Terpil who was arrested last Friday, following the grand jury indictment has been released on a $75,000 cash and collateral bond.

Bower, the president of J. S. Brower and Associates in Pomona, Calif., also pleaded innocent yesterday to charges that he lied to the federal grand jury investigating the case. Brower was released on personal recognizance.

Judge John H. Pratt scheduled a second hearing for Terpil and Brower for May 16.