Braking Action Computation Function (BACF)

Improve runway condition awareness

Use the aircraft as a sensor to measure and report the braking action the aircraft experienced during landing.

How does it work?

AIRBUS has developed a new AIRBUS aircraft function which uses on board data to identify the braking action the aircraft experienced during landing.

The implementation of this function on AIRBUS aircraft, called the “Braking Action Computation Function’ (BACF)”, responds to recommendations issued by several safety bodies, such as the NTSB, for “an operationally feasible airplane-based braking ability / runway surface condition measurement and communication system”.

The fundamental principle of the function is, post landing, to use the data measured by the aircraft during its landing roll to identify the braking action level. By using the aircraft performance model, it is possible to differentiate the parts of deceleration coming from aerodynamics, thrust reverse, and wheel-braking.

By comparing the actual wheel braking performance to models of wheel-braking performance for standardized “reference” runway conditions, the software can identify the braking action(s) the aircraft experienced.

As well as being able to detect several different braking actions along the runway, each braking action zone is GPS tagged to identify exactly where on the runway they occurred.

After landing, the flight crew may directly consult the braking action report on a dedicated MCDU page. The flight crew may use this information, along with their own observations as part of their Pilot Report (PIREP) of Braking Action back to Air Traffic Services.

ACARS data sent to the ground systems with the results, gives digital data about the braking actions experienced across their fleet of aircraft, throughout their route network.

Initial availability of the BACF is for the A320 and A330 aircraft families. The BACF software consists of an ATSU AOC application and is available as an AIRBUS Standard Service Bulletin – Free-Of-Charge.

Do you want to install BACF on your aircraft? Just create a ticket, here


See video
See video


  1. Pilot awareness of braking action via instant feedback through the MCDU

  2. Objective feedback for help with Pilot Braking Action Report

  3. Awareness of slippery conditions, risk management within route network

facts & figures

Already 1,600+ aircraft committed to be equipped with BACF



Capt. Karl Wilhelmson
Fleet Chief Pilot A320, Scandinavian Airlines

“SAS has installed the BACF system in our Airbus fleet to use RunwaySense as a means to increase pilot awareness of actual vs. predicted runway conditions and thus, to enhance operational safety. Furthermore, the system offers possibilities to, on a strategic scale, increase cooperation between manufacturers, operators and airports, especially with the introduction of the Global Reporting Format and standardized use of Runway Condition Codes. We at SAS are looking forward to a full use of both these aspects of the BACF and RunwaySense systems and so far we are happy with the results. I hope that we will see more of this kind of effective and efficient use of data and systems to increase safety in airline operations.”

Latest news about this product

News - 16/12/2021

Avinor selects NAVBLUE’s RunwaySense for 15 airports in Norway

News - 16/12/2021

Avinor selects NAVBLUE’s RunwaySense for 15 airports in Norway

Avinor, the wholly-owned state limited company under the Norwegian Ministry of Transport and Communications, ...

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