| 11. | Head admitted there must have been fatigue cracks in the steering column of Senna's car.
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| 12. | A fatigue crack had initiated in weld metal on the inner surface of the socket.
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| 13. | This is essentially a notch in the material which can be a potential source of fatigue cracks.
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| 14. | This led to a fatigue crack in an attachment screw and allowed the trim tab to flutter.
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| 15. | The order stems from reports of fatigue cracks on the aft pressure bulkhead of some Boeing 737-200 models.
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| 16. | The prototype was later cut up after suffering from fatigue cracks in the engine / propeller mounting structures.
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| 17. | Overpeening will cause excessive cold working of the surface of the workpiece, which can also cause fatigue cracks.
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| 18. | The Washington Post reported on Friday that investigators have discovered fatigue cracks in the 22-year-old plane's rear fuselage.
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| 19. | Records indicate that other incidents of fatigue cracks have occurred in similar engines since 1974, the safety board said.
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| 20. | After propagating through the weld metal during a large number of flights, the fatigue crack entered the socket's parent metal.
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