Engineering

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Across
  1. 3. To roughly calculate the cost, value, or quantity
  2. 4. To keep something in good condition
  3. 8. Weakness in materials caused by repeated stress
  4. 9. Protection of computer systems from digital attacks
  5. 10. Industry concerned with aviation and space flight
  6. 12. A plan giving lists of intended events and times
  7. 13. A person who designs, builds, or maintains machines
  8. 14. Consistently good in quality or performance
  9. 15. A barrier constructed to hold back water
Down
  1. 1. To put a decision or plan into effect
  2. 2. To create a plan or drawing before building something
  3. 5. Basic physical structures like roads, bridges, and power supplies
  4. 6. To follow a rule or regulation
  5. 7. Possible to do easily or conveniently; achievable
  6. 11. A liquid fossil fuel; crude oil