Crew can arm and disarm the door by moving a special level, locked with a pin. Note – it is physically impossible for the aircraft door to open mid-flight due to the difference in air pressure inside the cabin and outside in the atmosphere.
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Changes were made to cockpit security in order to make hijackings more difficult. The US Federal Aviation Administration recommends that doors be strong enough to withstand a grenade blast. Also, they are usually left locked for the duration of the flight.
A normal approach and landing are not something as severe to put someone performing CPR at imminent risk of their own safety, so you keep going. Simply put, if you stop CPR the patient is going to die.
Flight attendants should have poise, tact, and resourcefulness to handle stressful situations and meet passengers' needs. Decision-making skills. Flight attendants must be able to act decisively in emergency situations.