Original Message

Regardless of wind. The only effect of winds on ETL is to shorten, or lengthen distance, not airspeed. Imagine hovering with a 20kt tailwind. As you taxi forward with that 20 knot tailwind(zero ground speed), you will reach 20 knots of ground speed, but have zero airspeed. At 40 knots ground speed, you would achieve 20 knots of airspeed, and assuming ETL for that aircraft is 20 knots, only then would you achieve ETL. With the same aircraft and a 20 knot headwind, you would be hovering in ETL. If you are a pilot, you need to turn in your certificate. If you are a Murse, carry on smartly.