Which monthly tolerance is specified for the gating interlock?

• A. Functional
• B. 1%
• C. 2%
• D. ±1 mm

Answer: (A)

Functional tolerance focuses on whether the part performs its intended job rather than on its exact size. For a gating interlock, the critical issue is reliable operation and safety during use, not fitting a specific dimension. So the monthly tolerance is defined by how well the interlock must function under normal variation, which is captured by a functional tolerance. Numeric options like a percent or a fixed millimeter value would tie acceptance to size rather than to correct operation, making them unsuitable for a device whose primary requirement is correct behavior.