reduction of carbon brake oxidation) .. Risk of tire deflation .. Tire wear .. Turn around time (reduction of brake cooling time).
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Optimization of the runway occupancy: BTV is able to predict and optimize the Runway Occupancy Time (ROT). When aware of ROT, the ATC controller is able to optimize the flow of arrivals.
- Reduction of environmental impacts: BTV reduces fuel burn thanks to reduced ROT and reduced use of thrust reversers. BTV also reduces emission of carbon dust from brake wear.
- Improvement of the passenger comfort.
5.6.1. ROW/ROP PRINCIPLES
The ROW/ROP function:
. Computes the landing distances considering the auto brake is set to HI in:
- Dry conditions: Dry runway with the use of reversers
- Wet conditions: The greatest landing distance between:
.. Wet runway without the use of reversers
.. Water contaminated runway with the use of reversers.
. Compares these landing distances to the Landing Distance Available (LDA – including potential runway shifts) taking into account parameters like:
- Aircraft weight -Vertical profile (glide slope, 50 ft
- Ground speed RA, flare)
- Wind -Landing configuration.
. Triggers an alert when one of the landing distances is greater than LDA.
Definitions of runway states as per EU-OPS1 Contaminated runway: A runway is considered to be contaminated when more than 25 % of the runway surface area (whether in isolated areas or not) within the required length and width being used is covered by the following:
i. Surface water more than 3 mm (0.125 in) deep, or by slush, or loose snow, equivalent to more than 3 mm (0.125 in) of water, or
ii. Snow which has been compressed into a solid mass which resists further compression and will hold together or break into lumps if picked up (compacted snow), or
iii. Ice, including wet ice.
Dry runway: A dry runway is one which is neither wet nor contaminated, and includes those paved runways which have been specially prepared with grooves or porous pavement and maintained to retain “effectively dry” braking action even when moisture is present.
Wet runway: A runway is considered wet when the runway surface is covered with water, or equivalent, less than specified in [contaminated runway] or when there is sufficient moisture on the runway surface to cause it to appear reflective, but without significant areas of standing water.
5.6.1.1. AUTOMATIC DETECTION OF THE RUNWAY FOR LANDING
When the destination airport is known (i.e. in the FMS flight plan), the runway for landing is automatically detected. The auto-detection of the landing runway aims at coping with mistakes or omissions of the flight crew, or late runway changes.
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