Two public hearings on proposals to adjust Metrobus service in Falls Church, designed to reduce subsidy payments, will be conducted by the transit authority this month.

A third hearing will be held on a federal grant that will provide $17.7 million in subsidy assistance for the 1978 fiscal year.

Hearings on the proposals to reduce Metrobus subsidies by about $203,000 a year will be held at 7.30 p.m. Tuesday, Nov. 29, at Thomas Jefferson Junior High School, 125 S. Old Glebe Rd., Arlington, and at 7.30 p.m. Wednesday, Nov. 30, at George Mason Junior/Senior High School, Leesburg Pike and Haycock Road, Falls Church.

Proposals to be considered will include service changes on Routes 1 (Wilson Boulevard Line), 2 (Washington Boulevard Line), 3 (Lee Highway Line), 20 (Arlington Boulevard Line), and 22 (Washington Boulevard - Pentagon Line).

Alternate routing of 2T buses on S. West Street and the hours of service also will be discussed. Service changes proposed by the Northern Virginia Transportation Commission and Falls Church are designed to reduce subsidy costs.In some cases, a transfer may be required to complete a trip, and in others, passengers may have to wait longer for a bus. Service changes which come as a result of the hearings are to be implemented this spring.

The hearing on the availability of federal funds to pay part of the Metrobus subsidy for the fiscal year ending June 30, 1978, will be held at 2 p.m. Wednesday, Nov. 30, at transit authority headquarters.

Information on the hearings is available through the Washington Metropolitan Area Transit Authority Office of Marketing at 637-1328. To register to speak at a hearing, write Mr. Delmer Ison, Secretary-Treasurer, WMATA, 600 Fifth St. NW, Washington, D.C. 20001, or call 637-1092.