B767 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Total 10481
Troubleshooting; Time Pressure
Aircraft Equipment Problem Critical
Flight Crew Landed in Emergency Condition
Human Factors; Aircraft
While departing from ZZZ there was a loud bang on climb out. We could not determine where it came from; there were no lights or EICAS messages. Then the flight attendants called to ask what the noise was. We talked about the noise and could not determine where the noise came from. There weren't any strange noises or vibrations so we decided to continue. We didn't have any more issues along the way. Then when we got up to YYY and started prepping for the approach and landing. The Captain was flying and when we put the gear down there was a bang. We had 2 out of 3 green down and locked gear lights. We did a go-around to trouble shoot the problem. We went into the QRH but nothing seemed to work. The Captain called ops and maintenance but we could not get 3 green gear lights.By this time the fuel was getting low so we decided to go and land. After landing and stopping the fire and rescue came in to check out the plane. We then had to wait for maintenance to arrive to secure the gear. Once the gear were ready they towed us to the gate.
B767 First Officer reported a loud bang during climb out and again on approach during gear extension.