They need to be because mechanical defects can affect accuracy.

The police were trying to determine whether a mechanical defect or driver error had caused the accident.

Council officials say lives were at risk from mechanical defects, including faulty brakes.

It had many mechanical defects which prevented its use as a practical apparatus.

He said that no mechanical or electrical defect had been found in the lift after the accident.

Through mechanical defects, not all the tanks reached the battlefield and of those that did only 31 crossed the German lines.

No mechanical defects, other than the inoperative fuel pump, were reported.

The weapon is made by local blacksmiths, and due to this, it has many mechanical defects.

Only later did the police learn that the car had not been sabotaged: the problem was a mechanical defect.

Such errors are typically caused by mechanical or structural defects.