Fire!

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Across
  1. 2. Which single point detection returns to normal when cool?
  2. 4. To create a warning how many smoke detectors need to be activated?
  3. 7. How is fire extinguisher plug taken off?
  4. 8. What colour dye is an indicator surrounded by?
  5. 10. How many minutes does metered fire suppression last?
  6. 12. How are inertia switches wired?
Down
  1. 1. How is smoke made apparent in cargo bay?
  2. 3. How is the aircraft fire push switch powered?
  3. 5. What moves rapidly when an aircraft crashes?
  4. 6. How is a fire extinguisher pressure relieved?
  5. 7. What happens to helium when it is heated?
  6. 9. What closes when pressure increases?
  7. 11. What should electro captive firewire be formed by?