If you suspect carbon monoxide poisoning in flight, which of the following actions should a crew member take? 

1. Turn the cabin heat off. 

2. Turn the cabin heat on. 

3. Select the maximum rate of fresh air ventilation to the cabin. 

4. Turn off all fresh air ventilation to the cabin

5.  Open the window if the environment allows. 

6. Land as soon as possible/practicable and seek medical attention. 

 7. Avoid using supplemental oxygen.