Which instrument provides information about both engine speed and rotor speed?

• A. Touch Screen Display
• B. Triple Tachometer
• C. Rate of Climb Indicator
• D. Gyro Indicator

Answer: (B)

The choice referring to the triple tachometer is accurate because a triple tachometer is specifically designed to display both engine speed and rotor speed within a single instrument. In aviation, engine speed is typically measured in revolutions per minute (RPM), while rotor speed is also indicated in RPM but is linked to the rotor system of the aircraft, especially in helicopters. This instrument allows pilots to monitor both crucial parameters simultaneously, enhancing situational awareness and control over the aircraft's performance.

In contrast, the touch screen display is a more general interface that may provide various flight data but does not specifically focus on or specialize in showing engine and rotor speeds. The rate of climb indicator measures the vertical speed of the aircraft, indicating how fast it is climbing or descending, rather than engine or rotor speed. The gyro indicator serves to provide information regarding aircraft orientation and movement, particularly in terms of heading and attitude, and does not convey speed data relevant to the engine or rotor.