How loud is the Sr 71?

The SR-71 Blackbird is known for its significant noise levels due to its powerful engines, producing sound levels around 130 decibels during takeoff. However, when flying at high altitudes and speeds, it often exceeds Mach 3, creating a sonic boom that can be heard even from the ground. This combination of engine noise and supersonic flight makes the SR-71 one of the loudest aircraft in operation.