Decision Speed

The pilot must decide before the aircraft reaches V1 speed whether or not the take-off should be aborted.

Tip: If using the IF-Assistant app, subtract 5 knots when setting the V1 callout. In real operations, V1 is called out 5 knots early.


Rotation Speed

Vr is the speed at which the pilot rotates the aircraft to the specified pitch angle, generally 5° to 7.5°.


Take-off Safety Speed

The minimum speed for which the aircraft can safely fly on one engine.



Initial Climb Speed

As the pilot pitches the nose angle of the aircraft up during initial climbout, he/she should aim for a target speed (T/O Pitch) instead of a certain vertical speed. While maintaining take-off thrust, the pilot should pitch the nose of the aircraft up until stabilized at the T/O Pitch speed.

This speed is generally reached with a 12.5° to 18° pitch angle. The pilot should pitch the aircraft when approaching T/O Pitch speed so that the speed neither increases nor decreases with proper thrust set. At 1500', the pilot then reduces thrust by 2-6% N1 and lowers the nose to accelerate up to 250 knots.


Retraction to Flaps 1

The speed above which the pilot should retract flaps to Flaps 1 if the aircraft is set with Flaps 2 or more.


Full Flaps Retraction

The speed above which the aircraft should be set to Flaps Up.

green dot

Minimum clean speed

The minimum clean speed on takeoff.


green dot

Flaps 1

On landing, Green Dot is the speed below which the pilot should select Flaps 1.


Approach Speed

The final approach speed when the Slats/Flaps are in landing configuration and the landing gears are extended.


Landing Speed

The speed required as the landing runway threshold is crossed at a height of 50 feet in landing configuration. Defined as 1.3x the stalling speed in the stated landing configuration at the prevailing aircraft weight.