B767-300 and 300 ER
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Troubleshooting
Aircraft Equipment Problem Critical; Inflight Event / Encounter Bird / Animal
Air Traffic Control Provided Assistance; Aircraft Aircraft Damaged; Flight Crew Returned To Departure Airport; Flight Crew Landed As Precaution; Flight Crew Requested ATC Assistance / Clarification; General Flight Cancelled / Delayed; General Maintenance Action
Environment - Non Weather Related; Aircraft
Bird Strike On takeoff out of ZZZZ at XA:21Z on date.  We noted a flock of about 50 to 75 birds that were a little more than halfway down the runway.  The aircraft was about 10 knots below V1.  The flock took off around the aircraft. The only bird the crew physically saw hit the aircraft was one that impacted over the captains windshield.   We continued the takeoff roll and the takeoff and subsequent climb were normal. We notified departure control that we had a bird strike. They asked if we wanted to return. We told then to standby while it was discussed. At approximately 8;000 feet; an abnormal high vibration was noted in the N1 section of he right engine. The vibration was noted to be 5.0. The Captain consulted the Flight Mechanic. The Mechanic stated that he thought he felt a vibration and heard unusual sounds in the back. We opted at that point to return to ZZZZ. The Captain assigned duties to each of the 3 flight crew members.  He had the FO fly the airplane. The Captain worked the checklist to begin a needed fuel dump to prevent an overweight landing. The observer FO was designated to contact the company and talk to the flight attendants about the issue. As the observer; I contacted the company via sat phone. Told them we would be returning to ZZZZ; and that we would be dumping fuel.  After that I contacted the purser to advise her we were a return. I asked if she had any questions. She indicated she did not.  I then; under the direction of the Captain; made a brief announcement about the fuel jettison so passengers would not be alarmed When I was done with my duties; I asked the Captain what I could help with. He had just finished up the dump. Finished the checklist and said that he was caught up.  He had also retrieved numbers for both a normal and a single engine landing to runway XX.  At this point we had descended; descent and approach checks were complete; and we were set up for a left base entry visual runway XX.   The approach and landing were uneventful. On the landing roll we encountered another flock of birds and hear a couple strikes forward. Upon exiting the aircraft; severe damage to the right engine fan and shroud were noted.
At 10 knots prior to V1 we encountered several bird strikes at ZZZZ Airport on takeoff. At least 50 plus birds flew from the right to the left side of the aircraft and one bird hit the airplane just above the Captains head and some on the right side of the aircraft near the right engine. It was my takeoff (FO) and we continued. The Captain reported it to ATC. ATC asked if we needed to return to the airport and the Captain initially said that we do not need to return. We weren't sure of the damage at that moment and shortly there after around 8;000 feet the relief pilot said the right engine FAN vibrations are at a max of 5.0 with all other engine indications normal. The Captain then called ATC to request a level off at FL150 and I maintained a reduced airspeed of 280 knots to avoid any unnecessary stress on the airplane. At that time the relief pilot was communicating with dispatch per the Captains request and the flight attendants as to the status of our aircraft; plus a PA to our passengers to keep them all informed of our situation. The Captain was in constant communication with ATC.The Captain then consulted with maintenance and he told us it was really loud in the aircraft; so we all were in agreement and made the decision to return to the airport.The Captain then told ATC that we wanted to return to ZZZZ; but we need to jettison fuel to be able to land below landing weight. The Captain then requested to jettison fuel with ATC. The Captain was running the QRH to jettison fuel as I followed along and the Captain also was getting our performance numbers for landing.We received authorization to fly in the vicinity of the airport and jettison fuel for 14 minutes. Then the Captain requested runway XX for landing and I (FO) shot the visual approach and landed. As I was rolling out around 130 knots we encountered numerous bird strikes again and reported that to the tower and ground frequency. At 60 knots the Captain took control of the aircraft from me and taxied to our assigned parking. On my post flight walk around I noticed severe damage to the inside cowling and all the fan blades on the right engine. Plus a marking above the Captains L1 window.I would suggest that ZZZZ finds a method of bird control at their airport to avoid this situation from happening again to another aircraft.
Flight Crew reported an air turn back after birds were ingested by the right engine on takeoff.