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Similar questions have been asked ; a partial answer is in 14 CFR part 33-76, stating 16 small birds ( 85 g) must be tolerated . But what other qualification tests are there ; for medium and large birds ? I understand the Rolls Royce RB 211 (?) failed the larger bird test and had to be reworked to replace carbon fiber fan blades with titanium. What is the larger bird test ? Accepting that none will survive a flock of geese or ducks.

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  • $\begingroup$ 14 CFR part 33.76 contains a table with bird masses and 3 intake throat areas; the smallest engines must cope with a 1.85 kg bird and the largest with a 3.65 kg bird. Since you list that specification, what is there left to answer? Note that this are the current requirements; those at the time of RB211 development might have been different. $\endgroup$ – Peter Kämpf Jun 9 '19 at 1:01
  • $\begingroup$ It doesn't much matter, soon there will be no birds. $\endgroup$ – quiet flyer Jun 9 '19 at 22:33

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