President Carter has nominated a Civil Aeronautics Board official, Reuben B. Robertson, to be chairman of the Administrative Conference of the United States for a five-year term.

The Administration Conference is an independent agency created in 1964 to study government agencies and recommend ways to make their procedures more efficient and fair. Its members include agency heads, other federal officials, private lawyers, university professors and other experts in administrative law and government.

Robertson, 40, director of the CAB's bureau of consumer protection, would succeed Robert Anthony as a chairman.

Before joining the CAB two years ago when Alfred E. Kahn was chairman, Robertson served as consultant to the Office of Rail Public Counsel at the Interstate Commerce Commission, as legal director of the Aviation Consumer Action Project -- a group associated with Ralph Nader that participated in many CAB proceedings -- as a lawyer with the Federal Highway Administration and as an attorney with Covington and Burling.

President Carter also announced two nominations to the council, the 10-member exective board of the conference: Ronald B. Lewis, deputy advisor for regulatory policies of the Council on Wage and Price Stability, and Franklin M. Schultz, a paprtner in the Washington law firm of Purcell and Nelson.

The president also announced that he has designated Joan Z. Bernstein, general counsel of the Department of Health and Human Services, as vice chair of the conference.