If you notice unusual noises or vibrations in a D1 or D bus, the prudent action is to:

Options

• Check the cause and do not dismiss it

  Unusual noises and vibrations may indicate a fault that should be checked as soon as possible.

• Assume it will go away on its own

  Incorrect answer for this practice-bank question.

• Compensate by increasing speed

  Incorrect answer for this practice-bank question.