It’s starting to look like Jeju 2216 went down because of a double bird strike.

Investigators found bird feathers and blood in both engines of the Jeju Air jet that crashed in South Korea last month, killing 179 people, a person familiar with the probe told Reuters on Friday.

With both engines being out and the APU being offline, there would be only (very minimal) standby power available to the aircraft. Which is why the microphones for the cockpit voice recorder didn’t work.

The bird strikes might have happened very close to each other. Probably a flock of large birds from one of the nearby nesting areas. While two separate bird strikes are pretty rare, double strikes due to bird flocks seem to happen once in a while and are often devastating. It is not impossible to land a plane successfully after such an accident, however. Both US Airways 1549 and Ural Airlines 178 were struck by a flock of birds after takeoff and ditched without fatalities. You’ve got to have nerves of steel to pull something like that off, though.