Code 7700. This is the code for a general emergency. 7700 can be entered into the transponder for a variety of reasons, and some of the most common include medical emergencies, engine failure, problems with pressurization or landing gear, issues with flight control, and more.
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The most common in-flight medical emergencies involve:
A rough estimate of the probability of an airplane going down due to an emergency is about 1 in 11 million, meaning it would take us quite a few lifetimes before actually experiencing a plane crash.
Squawking 7700 in an emergencyReserved codes are used in particular situations when an aircraft wants to communicate something to ATC urgently. The most well know of these is the code 7700. This is used to indicate an emergency of any kind.
Many pilots delay declaring an emergency until the most serious of situations because there's a perception of heightened pressure or paperwork awaiting you on the ground.
At night pilots will turn their gaze from outside to inside and use the artificial horizon. The artificial horizon is normally a simply globe split into two hemispheres. Using this instrument, the pilot can determine whether the aircraft is in a climb, a dive, or rolling.