(although any four-pound bird will do), is just one
of a series of bird-strike tests any new engine must
pass to earn FAA certification.
Along with the single four-pound bird (recently raised
to an eight-pound bird for very large engines), an engine
must also swallow a volley of eight one-and-a-half pound
birds, fired in quick succession, and a further volley
of sixteen smaller birds of three ounces each.
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