Which statement about measurement tools is correct?

Which statement about measurement tools is correct?

• A. Dividers do not provide a reading when used as a measuring device
• B. An outside micrometer is limited to measuring diameters
• C. Tools used on a certificated aircraft must be an approved type
• D. A caliper can read fractional measurements directly

Answer: (C)

Tools used on certificated aircraft must be of approved type. This requirement ensures that the instruments used for airworthiness work have been tested and approved for aviation, with known tolerances and calibration traceability. Using approved tools helps guarantee measurements are accurate, consistent, and compliant with safety standards and regulations. Dividers don’t provide a numerical reading by themselves; you read a measurement by transferring the span to a scale or ruler. So claiming they don’t provide a reading isn’t correct. An outside micrometer measures external dimensions, but it isn’t limited to diameters—its job is to capture any external size, such as outside diameter or thickness. So the idea that it’s restricted to diameters isn’t accurate. Calipers are typically read in decimal inches or metric units, and while some calipers may have fractional scales, they do not generally provide direct fractional readings; decimal or metric readings are the standard, which makes the statement about direct fractional readings not reliable.

Tools used on certificated aircraft must be of approved type. This requirement ensures that the instruments used for airworthiness work have been tested and approved for aviation, with known tolerances and calibration traceability. Using approved tools helps guarantee measurements are accurate, consistent, and compliant with safety standards and regulations.

Dividers don’t provide a numerical reading by themselves; you read a measurement by transferring the span to a scale or ruler. So claiming they don’t provide a reading isn’t correct. An outside micrometer measures external dimensions, but it isn’t limited to diameters—its job is to capture any external size, such as outside diameter or thickness. So the idea that it’s restricted to diameters isn’t accurate. Calipers are typically read in decimal inches or metric units, and while some calipers may have fractional scales, they do not generally provide direct fractional readings; decimal or metric readings are the standard, which makes the statement about direct fractional readings not reliable.