College

A 16½ inch brake drum, specified to have a machine limit of 0.090 inch over and a maximum dimension of 0.120 inch over, is measured at 0.098 inch over during a brake overhaul.

Technician A says that the drum can be turned on a drum lathe, providing that the maximum dimension of 0.120 inch is observed. Technician B says that the drum can be legally returned to service without being turned.

Who is correct?

a) Technician A
b) Technician B
c) Both A and B
d) Neither A nor B

Answer :

Technician B is correct. The brake drum's measured dimension of 0.098 inches over falls within the specified machine limit of 0.090 inches over, indicating it can be legally returned to service without needing to be turned on a lathe.

Technician B is correct because the measured dimension of 0.098 inches over the specified machine limit of 0.090 inches still falls within the maximum allowed dimension of 0.120 inches over.

This means the brake drum is within acceptable tolerance and can be safely returned to service without requiring any machining on a lathe.

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