What caused Stevie Ray Vaughan's helicopter to crash?

Related questions

1. Does Eric Clapton still tour?
2. Is Eric Clapton still married?
3. How old was Eric Clapton's son when he fell to his death?
4. How did Conor Clapton fall?
5. Is Tears in Heaven about his son?
6. Why did Eric Clapton write Tears in Heaven?
7. Which Beatles are dead?
8. Will Clapton tour again?
9. Has Eric Clapton retired from touring?
10. Where does Eric Clapton live?

Tags

1. #heavy
2. #people
3. #wisconsin
4. #musician
5. #probable
6. #killed
7. #concert
8. #helicopter
9. #stevie
10. #federal
11. #pilot
12. #cites
13. #other
14. #error
15. #dallas
16. #report
17. #facility
18. #performed
19. #years
20. #cause
21. #where
22. #vaughan
23. #crash