I gave an IPC to a gentleman one night in a turbonormalized AC-500 Shrike. Things went well, and on short final to KSGR on the ILS, we heard several loud thumps and the airplane shook a little. Birds. We got the hell out of there and went back to West Houston and landed uneventfully. Next morning we surveyed the damage. We must have hit a whole flock of birds at around 140 knots because we cracked the left windshield, the left cowl lip, a landing light, OAT probe, and the right prop took one enough to take the deice pad off it, which hit the fuselage hard enough to put a hole in it.
from: www.int-birdstrike.org/Athens_Papers/IBSC27%20WPI-3.pdf
For instance, during the FAA sponsored high- speed climb test at Houston, Texas in 1998, a Delta Air Lines B727 collided with a flock of snow geese (5-7 pounds) at 280 KIAS. The #1engine was destroyed by bird ingestion, the #2 engine was damaged by ingestion of radome parts (radome and radar unit were knocked off the aircraft by collision with birds) and the #3 engine, while suffering no direct ingestion damage, was put at risk as two birds penetrated the pylon which holds the engine onto the airframe and contains both fuel lines and control cables. Obviously this was a serious event, but it was not recorded as a multiple bird ingestion event as the #2 engine was not damaged by birds, rather by airplane parts knocked off the airplane by birds. The #3 engine had no ingestion, so the pylon penetration was considered by the engine certification group as a structures matter. As the aircraft did not crash there was no reason to amend the standards.
this too: http://www.birdstrike.org/commlink/signif.htm