A screening committee last night recommended two candidates to fill a seat on the Fairfax County School Board vacated by Katherine Hanley this month when she was elected to the county Board of Supervisors.

Committee Chairman Ann Kahn said the panel voted unanimously to recommend Letty Fleetwood or Pat Hanlon, both of whom are active in PTA and county organizations.

The screening committee was appointed by Hanley, who is expected to select her successor on the School Board. The Board of Supervisors is to vote to fill the seat next week, and by tradition it approves the choice of the supervisor of the district to be represented. Hanley, a Democrat from the Providence district, did not make her choice known at a brief public hearing before the supervisors last night.

Kahn said the two recommended candidates have strong records of community service, countywide experience and an understanding of the state and national forces affecting education.

Four speakers testified on behalf of Fleetwood, who has been president of PTAs at Graham Road Elementary School and Whittier and Luther Jackson intermediate schools. Fleetwood has served on several School Board task forces and is vice chairman of the county's Child Care Advisory Council.

Hanlon, 39, is president of the Camelot Elementary School PTA, first vice president of the Fairfax County Council of PTAs and a member of the county's Juvenile Court Advisory Committee. He is a lawyer with a doctorate in government.

Two other candidates who applied for the School Board seat are Sally Ormsby, a civic and PTA activist, and David Banks, also a Providence district resident.

Several speakers, including Del. Alan Mayer (D-Fairfax) and former county Board of Supervisors chairman Jean Packard, a Democrat, spoke on behalf of Ormsby, who is the Woodson High School PTA president, a former president of the Fairfax Federation of Citizens Associations and the president of the Mantua Citizens Association.

Hanley was elected to the county board to replace James M. Scott, another Democrat, who resigned to work for the Fairfax Hospital Association.

The 10-member School Board has been without a representative from the Providence district, which is in central Fairfax County, since July 1. The board is not scheduled to meet again until September.

A law that took effect last year requires that the supervisors hold public hearings before appointing School Board members. Hanley said the board technically would not have been required to hold a hearing, because one was held just before her resignation took effect, but that it did so at her request.