What is the barking sound on a plane?

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Tags

1. #nascar
2. #systems
3. #makes
4. #sound
5. #family
6. #airbus
7. #suspect
8. #barking
9. #power
10. #hydraulic
11. #described
12. #normal
13. #sawing
14. #activates
15. #during
16. #powers
17. #referring
18. #transfer
19. #noise