Metro has reached an out-of-court settlement with the family of a 2-year-old Brentwood boy who was killed a year ago when he was run over by the rear wheels of a bus.

The family of Ta Von Gamble will receive $437,000 and has dropped a lawsuit seeking $5 million from the transit agency.

Metro's investigation blamed the bus driver and a faulty mechanical device for the accident, which occurred Dec. 6, 1986, as the boy and his mother left the bus through its rear doors at a stop on 38th Avenue just south of Allison Street in Hyattsville.

The boy's mother was standing in the rear stairwell and Ta Von was off the bus when it lurched forward, according to the Metro report. "The primary cause of the accident was the failure of the bus operator to observe that the alighting passengers were not clear of the doors," the report said.

Additionally, the "interlock" device in the Grumman Flxible bus should have prevented it from moving forward while the rear doors were open, the report said.

The bus driver, Philip S. Williams of the District, was suspended for 10 days, retrained and allowed to resume his duties in July.