A red line through TO/TO occurs when the Vr and V2 are split by more than how many knots?

A red line through TO/TO occurs when the Vr and V2 are split by more than how many knots?

• A. 26 Knots
• B. 10 Knots
• C. 15 Knots
• D. 5 Knots

Answer: (A)

The key idea is how takeoff performance data are generated from two critical speeds: Vr, the speed at which the airplane rotates, and V2, the minimum speed to ensure safe continued flight after an engine failure. The published takeoff data assume Vr and V2 are reasonably close so you can rotate and still meet the required climb and obstacle clearance. If the Vr and V2 split becomes too large, the data can no longer be trusted for a normal takeoff, so a red indicator is shown to alert the crew to re-check performance calculations. In this aircraft, that warning line appears when Vr and V2 are separated by more than 26 knots. A gap larger than that means the standard takeoff performance data may no longer apply, and you should review the numbers or use an alternate procedure to ensure a safe takeoff.

The key idea is how takeoff performance data are generated from two critical speeds: Vr, the speed at which the airplane rotates, and V2, the minimum speed to ensure safe continued flight after an engine failure. The published takeoff data assume Vr and V2 are reasonably close so you can rotate and still meet the required climb and obstacle clearance. If the Vr and V2 split becomes too large, the data can no longer be trusted for a normal takeoff, so a red indicator is shown to alert the crew to re-check performance calculations.

In this aircraft, that warning line appears when Vr and V2 are separated by more than 26 knots. A gap larger than that means the standard takeoff performance data may no longer apply, and you should review the numbers or use an alternate procedure to ensure a safe takeoff.