Here is the correct sequence of steps to open a person's airway:
- Position the person: Lay the person flat on their back on a firm surface.
- Tilt the head back: Use one hand to tilt the head back gently by placing your palm on the forehead and pressing down while using two fingers of your other hand to lift the chin upward.
- Check the airway: Look, listen, and feel for breathing. Check for any obstructions in the mouth or throat.
- Clear the airway if needed: If there are visible obstructions (like food or vomit), use your fingers to remove them if possible or perform abdominal thrusts if necessary.
- Continue to monitor the airway: Ensure the airway remains open by maintaining head tilt and chin lift.
This sequence follows basic airway management principles, crucial in emergency situations.