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When the aircraft landing gear is firmly on the runway surface, the BTV combines audio and visual prompts to the flight crew in order to achieve the calculated required deceleration to achieve the designated turnoff point. If BTV senses that the aircraft will overrun the runway end, it automatically
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initially on the A380, after which it will announce planned incorporation schedules for other aircraft in the Airbus airliner product line. In 2006 Airbus indicated that following its introduction on the A380, the BTV " be followed by retrofits available on all of other Airbus aircraft families."
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The greatest potential advantage of the system is its ability to predict whether an aircraft will be able to stop safely on a specified runway. The pilot selects the runway and enters the reported surface conditions (wind direction, windspeed, wet or dry, cleared or slushy), and the computer uses
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The BTV uses the airliner's existing warning systems to alert the crew if unsafe conditions exist. If the system computes that the runway is too short when wet, an amber message appears in the primary flight display. If it computes that the runway is too short even under dry surface conditions,
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Proponents of the system point out that using BTV will reduce wear on brakes and tires (estimated at 20% reduction over present wear rates), less time that the aircraft spends within the active area of the runway, and enhanced ability to predict required cool-down time on the brakes (and thus to
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Airbus initially announced its plan to make the BTV system available by 2007, but the production bottlenecks that Airbus encountered in meeting the initial A380 delivery schedules apparently pushed back development of several such planned improvements. As of 2009 the company is seeking
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The flight crew inputs the selected runway, and the reported runway surface conditions. The flight computer updates its calculations using predicted speed and wind conditions until the airplane is 500 feet (150 m) above the surface, after which it uses actual speed and wind inputs.
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The BTV concept was born in a 1998 Ph.D. thesis by French engineer
Fabrice Villaumé, who became head of Airbus' BTV program and who holds patents on the process. Between 2002 and 2006 the computer routines were worked out, and the process was first tested on an
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until the computer figures the desired turnoff point can be achieved at a safe turnoff speed. If the taxiway departs the runway at 90 degrees, the BTV automatically disconnects when the aircraft groundspeed reduces to 10 knots. If the taxiway is a
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The BTV is a subset of the airliner's auto-flight computer, and allows that computer to be programmed for a pre-selected stopping distance. It indicates (and to some extent directs) which combination of brakes and
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stored runway information, computed aircraft weights and required approach speeds, and computed flare/touchdown characteristics to predict whether the stopping point will lie outside the runway's endpoint.
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applies maximum wheel braking, and it sends an aural message (to the flight crew) to apply maximum reverse thrust, along with a red message in the primary flight display. It continues to call out
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However, as of 2009 the company is indicating only that it will work on incorporating the feature on new A320s, and no definite availability schedule has been announced.
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Airbus engineers conducted much of the preliminary development work on the BTV using the smaller but similarly-configured (i.e. 4 engines)
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FR. 1. 20080234882 Method and Device to assist in the piloting of an aircraft in a landing phase, issued 25 September 2008
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overruns. A more tangible benefit is the increased ability to exit the runway at a specified turnoff point. The
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FR. 1. 20090150068 Method and Device for generating a taxiing trajectory for an aircraft, issued 11 June 2009
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107:(in red letters) is flashed on the primary flight display, accompanied by an aural signal.
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Please help update this article to reflect recent events or newly available information.
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In 2005 Airbus also announced its intention to incorporate BTV into the upcoming
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Airbus A350 - Full
Approach and Landing in Boston (ENG subtitles)
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EASA clears A380's brake-to-vacate and overrun protection
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As of 2018, the system is indeed incorporated in the
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327:"A350 Avionics: Combining the A330 and A380"
376:"Landing - What is Brake to Vacate (BTV)?"
57:(BTV) is additional software planned by
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94:are required to achieve that distance.
263:"Pilot Report: Airbus A380: AINonline"
325:Adams, Charlotte (1 September 2005).
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329:. Avionics Magazine. Archived from
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61:for incorporation on its line of
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71:European Aviation Safety Agency
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279:"Pilot Report - Airbus A380"
251:EADS Test Flight Description
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29:This article needs to be
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290:"A380 flight deck"
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390:Categories
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195:References
137:Advantages
41:April 2014
85:Operation
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396:Avionics
347:and the
159:Timeline
361:YouTube
273:15 July
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