Balanced Field Length explained [Accelerated Stop vs Accelerated Go distance, all you need to know]

The balanced field length is obtained when the Takeoff Distance Required (TODR) and the Accelerated Stop Distance Required are equal.

In order to understand this concept clearly, we need to talk about the Accelerated Stop and the Accelerated Go distance.

The Accelerated Stop Distance is the runway length required by an aircraft to accelerate to a specific speed, usually Vr, and, in case of engine failure at the critical point, to stop within the runway ASDA (Accelerated Stop Distance Available).

The Accelerated Go Distance is the runway length required by an aircraft to accelerate to a specific speed, usually Vr, and, in case of an engine failure at the critical point, also called Vef, to continue the takeoff and reach the end of the runway with a screen height of 35ft for a CAT A aeroplanes on a dry runway. (This screen height is reduced to 15ft on a wet runway).

When the Accelerated Stop and the Accelerated Go distance are equals you have a balanced speed, usually called Balanced V1.

If an engine failure occurs at low speed and you reject the takeoff you will stop the aircraft in a short distance, however, if the same failure occurs and you decide to continue your Accelerated Go distance will be very big since your acceleration is very slow due to the engine failure.

If an engine failure occurs at high speed, however, your Accelerated stop distance will increase substantially and your Accelerated Go distance will be reduced.

There is a point at which these two distances will be equal and this is the balanced V1.

If you want to more about the V1 takeoff speed watch the below video:
   • V1 Takeoff Speed - [decision speed explain...  

If you want to know more about the Accelerated Stop Distance Available and the Takeoff Distance Available watch the following YouTube video:
   • TORA TODA ASDA LDA Explanation - [Stopway,...  

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Disclaimer:
THIS VIDEO IS FOR ENTERTAINMENT PURPOSES ONLY.
NOT FOR REAL-LIFE OPERATIONS.
PLEASE REFER TO THE OFFICIAL MANUAL AND DOCUMENTATION.
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