This is the 4565th most frequent Russian word.
головного
"Головного" means "main" or "head" depending on context.
In this sentence, 'головного' refers to the 'chief' or 'main' role, describing an important position.
Головного инженера вызвали на срочное совещание.
The chief engineer was called to an urgent meeting.
Here, 'головного' is used to denote the primary or central computer required for the task.
Для выполнения задачи потребуется замена головного компьютера.
To accomplish the task, replacement of the main computer is required.
In this context, 'головного' signifies the principal or primary device involved in the situation.