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The photo below shows feathers still lodged in the booster blades after a 2.5hr flight. Unusually, neither pilot (I was one) saw any birds during the event. There had been no impact sound, smell, vibration or any other abnormal engine indications. In fact we were only alerted by a call from ATC telling us that a seagull had been found on the runway after our departure.


This is the same photo zoomed out and shows how easily it could have been missed on a walkaround, especially if the feathers were near the 12 o'clock position where they would be hidden from view by the fan blades.

Any birdstike into the core, or a birdstrike where not all of the remains of the bird can be found, requires a boroscope inspection within 10 cycles.

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*** Updated 18 Apr 2019 ***

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Above & below: Feathers in booster blades from a birdstrike.

The photo below shows a CFM56-3 that took a seagull at 160kts at 200ft after take-off. Again I had no abnormal engine indications but there was a strong smell of cooking bird for several minutes! You can see that blades 5,6 & 7 have all been bent by the impact.

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