Aviation Antonyms/Opposites

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Across
  1. 1. release
  2. 7. clockwise
  3. 10. replenish
  4. 12. allow
  5. 13. deflate
  6. 14. detach
  7. 15. extend
  8. 18. aft
Down
  1. 2. tighten
  2. 3. unservicable
  3. 4. disconnect
  4. 5. increase
  5. 6. remove
  6. 8. bottom
  7. 9. installation
  8. 11. abort
  9. 16. land
  10. 17. below