In the EET calculation example, which two values are used to compute the enroute time?

In the EET calculation example, which two values are used to compute the enroute time?

• A. Distance And Groundspeed
• B. Time Off Blocks
• C. Track And Wind
• D. TAS And Wind

Answer: (B)

Enroute time is determined by how far you have to travel and how fast you’re moving over the ground. In EET calculations, the duration of the enroute portion comes from dividing the leg distance by the groundspeed you expect to achieve on that leg. So the two values you actually use are the distance of the leg and the groundspeed along that leg (which comes from your true airspeed adjusted for wind). If you know the true airspeed and the wind, you can compute the groundspeed and then the time, but the direct inputs for the time calculation are distance and groundspeed. Time Off Blocks, while important for overall schedule, is a timestamp rather than a rate or distance used to compute enroute time. For example, a leg of 600 nautical miles with a groundspeed of 600 knots results in 1 hour of enroute time.

Enroute time is determined by how far you have to travel and how fast you’re moving over the ground. In EET calculations, the duration of the enroute portion comes from dividing the leg distance by the groundspeed you expect to achieve on that leg. So the two values you actually use are the distance of the leg and the groundspeed along that leg (which comes from your true airspeed adjusted for wind). If you know the true airspeed and the wind, you can compute the groundspeed and then the time, but the direct inputs for the time calculation are distance and groundspeed. Time Off Blocks, while important for overall schedule, is a timestamp rather than a rate or distance used to compute enroute time. For example, a leg of 600 nautical miles with a groundspeed of 600 knots results in 1 hour of enroute time.