When a plane rolls off the assembly line and before delivery to the customer, aircraft manufacturers carry out a Run-up; an obligatory series of tests to verify the correct functioning of the engines.
In a dedicated area, surrounded by insulating walls providing protection against the noise of blasts of air generated by their thrust, the engines are started up for the first time.
These so-called Run-up trials last two to three days. They are designed to measure, for example, the startup and engine shutdown times, engine temperatures, amount of vibration and maximum power.
It is only at the end of these trials that the airplane will make its first test flight, followed by delivery to the customer.
To know everything about run-up trials, watch our video "what is a run-up?".