What is the main warning for the aircraft to remind the crew? What will happen to the main warning?

The main warning is to remind pilots to correct in time when various sensors of the aircraft detect signals that affect the safety of the aircraft, otherwise a flight accident may occur. There may be many reasons for the warning. I can't remember exactly how the plane was graded. Is the highest grade level 3 or level 1? It slipped my mind. But only the highest level of warning will trigger the main warning, the second level is called early warning, and the next level is called consultation. When the main warning is triggered, the main warning light in front of the pilot and co-pilot lights up, and at the same time there will be a continuous warning sound, which is very loud. If it is a warning from the flight control system, it may be accompanied by warning information such as shaking the handle. There are many situations that may trigger warnings, such as near-ground warning, air traffic warning, stall warning, engine fire, cockpit loss and so on. However, different levels trigger different information, such as TCAS warning, air traffic warning and the possibility of collision between two planes. At first, the computer will give the crew a consultation message and give a prompt on the navigation display to remind the crew to pay attention. If the crew keeps flying, the warning message will not be triggered until 45 seconds before the collision, a single tone will appear in the cockpit and the main warning light will be on. If the flight continues, the warning will be triggered in 15 seconds, which is the highest level warning. All these prompts will be accompanied by a continuous sound and the main warning light will light up.