Former national security adviser John M. Poindexter asked a federal appeals court Friday to overturn his five felony convictions for lying to Congress about the Iran-Contra affair.

Attorneys for Poindexter, who served as Ronald Reagan's national security adviser from 1985 until the scandal became public nearly a year later, contended that prosecutors had produced insufficient evidence to sustain the convictions.They also argued that prosecutors failed to prove that references to testimony that Poindexter gave under a limited grant of immunity from prosecution to Congress had not unfairly influenced jurors and witnesses at the criminal trial.

In July, a split federal appellate panel set aside the Iran-Contra convictions of former White House aide Oliver L. North on the ground that his congressionally immunized testimony may have unfairly influenced his trial.