A week ago, Nate Haasis, the quarterback of a high school football team in Springfield, Ill., became his conference's leader in career passing yardage. Now he is winning praise for requesting that the record be expunged.

Haasis, a senior at Springfield Southeast High School, broke the record of 4,998 yards with a 37-yard pass on the final play of his team's 42-20 loss to Cahokia High School in the season-ending game last Saturday. The opportunity to break the record would never have occurred had the coaches of both teams not orchestrated a plan that enabled Haasis to shatter the mark, however.

Haasis is now asking for the disputed pass to be stricken from the record book, leaving him short of the record with 4,969 yards.

In a letter to the Central State Eight Conference's president, Chuck Hoots, Haasis wrote: ''While I admittedly would like to have passed the record, as I think most high school quarterbacks would, I am requesting that the Central State Eight does not include this pass in the record books. Reaching 4,969 yards required a lot of cooperation and hard work from my teammates. I do not wish to diminish the accomplishments that were made in the last three years.''