What condition on the tachometer involves two pointers overlapping?

What condition on the tachometer involves two pointers overlapping?

• A. Married Needles
• B. NAVAID
• C. Lead and Lag
• D. Mast Bumping

Answer: (A)

When a tachometer shows two pointers, it’s designed to display two separate speed readings, such as rotor RPM and engine or reference RPM. If those two pointers end up lining up at the same position, they visually merge into what pilots call “married needles.” This term describes the overlapping appearance and the potential confusion it can cause when trying to read the actual values. The important takeaway is to recognize that two readings are being shown, even though they look like one, and to verify the speeds using color cues on the gauge or a secondary instrument if the reading isn’t clear. Other terms describe different aviation concepts and don’t refer to this overlapping needle situation.

When a tachometer shows two pointers, it’s designed to display two separate speed readings, such as rotor RPM and engine or reference RPM. If those two pointers end up lining up at the same position, they visually merge into what pilots call “married needles.” This term describes the overlapping appearance and the potential confusion it can cause when trying to read the actual values. The important takeaway is to recognize that two readings are being shown, even though they look like one, and to verify the speeds using color cues on the gauge or a secondary instrument if the reading isn’t clear. Other terms describe different aviation concepts and don’t refer to this overlapping needle situation.