Former Redskin Clarence Harmon, a coach and aide at Fairfax County's Langley High School who resigned when school officials learned that he had pleaded guilty to a drug charge two years ago, asked yesterday to have his job back.

He made the request after receiving a flood of encouragement from supporters.

"The kids, the parents, the teachers, the administrators are all in favor of his returning, hopefully tomorrow morning," said Reed Saunders, president of the Langley High School Boosters Club. "I can't see any reason why he shouldn't."

Harmon, 29, sent a letter to R. Warren Eisenhower, assistant superintendent for personnel, asking that his resignation of Sept. 19 be withdrawn, according to a spokeswoman for the county schools.

But, the spokewoman added, a decision on reinstating Harmon will not be made until Eisenhower completes an investigation.

Harmon, a former running back for the Redskins, pleaded guilty to possession of a controlled substance in a widely publicized case in a Texas courtroom two years ago.

He was fined $5,000 and placed on probation for two to 10 years. Under Texas law, he is not considered to have a criminal record.

Harmon, who had been hired this fall, submitted his resignation after officials at Langley High School learned of the drug charge and planned to investigate his involvement.

School officials said Harmon told them that he did not want "to go back through that unfortunate incident."

But Saunders, members of the school's football team and other students, along with a number of parents, joined in asking Harmon not to leave.

Principal James E. Manning has said that everyone connected with the school was saddened by Harmon's resignation.

Kim Willoughby, the student representative to the School Board, yesterday called Harmon a "victim of circumstance."

She said that school officials' learning of Harmon's guilty plea came on the heels of a separate incident in which a former school psychologist, Arthur S. Pomerantz, had been arrested on child-abuse charges.

School officials promised tougher background checks of new employes after Pomerantz's arrest.

Willoughby said that Harmon "deserves a second chance."

She said the students believe that Harmon, who was well liked, was a good role model because he was an example of rehabilitation.

Harmon could not be reached for comment yesterday.