Flight Crew Air Transport Pilot (ATP)
Flight Crew Type 238
Aircraft Equipment Problem Less Severe
Flight Crew Returned To Departure Airport; Flight Crew Returned To Gate; General Maintenance Action; General Flight Cancelled / Delayed
Aircraft; Procedure; Weather
We pushed from the gate late due to late inbound. Upon approaching the runway for takeoff we received wind-shear system EICAS message and Weather Radar fail on the ND; we returned to the gate per MX and dispatch. Mx replaced the Wx radar computer and we taxied out for takeoff after another 1 hour delay. We tested the Radar and were painting Wx prior to departure. Climbing through about 6000 ft we received the same messages. We alerted Dispatch and Maintenance Control and later decided to return due to the Wx over the Atlantic.
B757 First Officer reported a weather radar failure during taxi out and returned to the gate for maintenance. After maintenance; the radar appeared to function normally and the flight departed. During climb; another weather radar fail was displayed and the crew elected to return to the departure airport due to expected weather enroute.