Which term refers to the tachometer needles that are not aligned?

Which term refers to the tachometer needles that are not aligned?

• A. Split Needles
• B. Offset Needles
• C. Misaligned Needles
• D. Separate Needles

Answer: (A)

Split needles describe a tachometer that shows two pointers not pointing to the same value. On gauges like this, both needles should coincide, giving a single, consistent RPM reading. When they don’t, it indicates the instrument is out of calibration or malfunctioning, so the reading can’t be trusted for precise engine or rotor speed. That visual of two needles separated on the same scale is exactly what the term “split needles” conveys. Other terms would be less precise or nonstandard for aviation gauges. If you ever see split needles, treat the instrument as unreliable and rely on other indicators or have maintenance check it.

Split needles describe a tachometer that shows two pointers not pointing to the same value. On gauges like this, both needles should coincide, giving a single, consistent RPM reading. When they don’t, it indicates the instrument is out of calibration or malfunctioning, so the reading can’t be trusted for precise engine or rotor speed. That visual of two needles separated on the same scale is exactly what the term “split needles” conveys. Other terms would be less precise or nonstandard for aviation gauges. If you ever see split needles, treat the instrument as unreliable and rely on other indicators or have maintenance check it.