Explaining the general use of the signal, SimpleFlying said: “This code is used to communicate all emergencies onboard a flight…
“Depending on the nature and severity, crews may conduct checks before formally declaring an emergency.
“When squawk 7700 is declared, all nearby ATCs (Air Traffic Control) are also informed of the emergency and pilots can fly the plane as they see fit regardless of the rules.”
Meanwhile, Boeing 757/767 pilot Captain Ken Hoke explained how an emergency is handled by the in-flight crew.
He told FlightRadar24: “In most ’emergencies’ we aren’t in a big hurry.