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Is this consider to be dangerous? for instance Could a bird stop a jet engine?
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Depends on the size of the bird and where/how it hits. Large turbofan engines will usually slice'em up pretty good and spit'em out the back with nary a hiccup. The fan blades and engines can take quite a beating and continue to operate. A well placed bird could damage a blade, unbalancing the whole fan section and create havoc, but most times it's a non-event. Multiple bird strikes could easily bring an aircraft down. The last one I remember was a KC135 out of Anchorage, AK some years back. They ran into a flock of birds right after takeoff and the aircraft crashed.
Have you ever seen footage of engine manufacturers shooting frozen chickens through an engine (on a test stand) operating at high rpm's? A high speed camera captures the event. It's absolutely amazing what those engines can take.
I've had a handful of bird strikes in my career. Most have been glancing blows around the nose section. 5 have been on the forward windows. Most of the hits have been at night. I guess the birds are blinded and confused by the lights. If you come up on a flock of birds inflight, try to climb or go over them. Birds will instinctively dive when startled.
Back in my commuter airline days, while based in CHO (Charlottesville, Va), I watched a Shorts 330 attempt to takeoff on it's first flight of the morning. The runway crested in the middle. A flock of seagulls sat in the middle of the runway on the opposite side of the crest from the takeoff roll. I thought they'd move upon hearing the approaching Shorts. They didn't. The next thing we heard was some loud banging, popping and feathers flying followed quickly by two engines going into hard reverse. The aircraft stopped safely but there were dead and injured birds all over the runway. It was actually a sad sight to see and I remember the airport workers driving around in a pick-up scooping up all the dead and dying birds with a shovel.
We did have a B757 back around 1988 suck in a pelican or some other very large marine bird out of Seattle, WA. as the crew was rotating for T/O. The engine ate itself as the tower reported large flames out of the tail pipe (no afterburner jokes!
). The crew made a safe single engine landing back at SeaTac after securing the engine. This serious situation was punctuated by a little humor as the tapes revealed that the crew performed the engine fire checklist flawlessly except that every recall item was begun with an expletive.