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Braking Availability Tester

What is it?

Objective Runway Condition Reporting

The BAT™ accurately measures and reports the effect of contaminant (snow, slush, water, other) on aircraft ASBS performance and calculates maximum ASBS braking availability values.  Results can be instantly disseminated to all authorized stakeholders.

Prevent Excursions

Cost Saving in Chemical

Less Time on Runway

Ease of Reporting

BAT Overview

  • Ground-based, mobile solution fitted with an emulative aircraft braking system
  • Aircraft anti-skid control valve that is controlled by an aircraft anti-skid braking system (ASBS) algorithm
  • Hydraulics and pneumatic control systems
  • On-board computers w/touchscreen operation
  • Intuitive software, with easy-to-use interface that allows for automatic operation of the BAT system
  • Designed to improve the understanding of aircraft anti-skid braking performance on in-situ contaminated runway surfaces during landing and takeoff events
  • Tested, vetted and improved over the last 6 years (FAA, others)

The BAT is compliant with FAA Take Off and Landing Performance Assessment (TALPA) and Global Reporting Format (GRF) input requirements supporting runway condition assessment with objective measurement. The BAT is an excellent TALPA decision support tool, providing objective information about aircraft ASBS performance on a condition by condition basis

Objectives of the BAT

  • Provide reconcilable, meaningful, safe/’accurate’ and useable aircraft ASBS braking availability values (MuAC coefficient)
  • BAT ‘Measurement’ results can be used to help pilots to calculate safe stopping distance requirements before landing (or, for a rejected takeoff), on contaminated runways
  • Accurately measure and report on the effect of contaminant (snow, slush, water, other) on aircraft ASBS performance
  • Use BAT results to support TALPA/Global Reporting Format submissions
  • Disseminate results and information to various stakeholders

Importance of the Technology

  • Our industry realizes that the understanding of actual Aircraft Anti-Skid Braking performance in contaminated conditions is limited, but very important for improving aviation safety
  • Current technologies for measuring runway conditions consider the relationship between a friction test tire and the runway surface but cannot properly represent aircraft antiskid braking performance in contaminated conditions
  • The BAT replicates the actual ASBS braking performance of an aircraft
  • The addition of ‘ASBS braking available’ measurement to runway condition reporting improves air safety by providing pilots with a timely and important (and previously unavailable) input in
    the land/do not land and take off decision making process

Pneumatics & Hydraulics

  • Pneumatics: The recoverable pneumatic system performs two tasks: The actuation of the chassis airbags to allow for ease of loading/unloading, & also actuates the engagement and retraction cycle of the BAT wheel carrier assembly
  • Hydraulics: The closed-loop hydraulic system is pressurized to a predetermined operating pressure to perform the brake-caliper engagement and retraction sequence on the rotor (The frequency of brake-application pressure is controlled by the ASBS algorithm, and all brake pressures are monitored by electronic pressure gauges)

BAT Technology & Components

  • Ford 450 – 440 HP
  • BAT Pneumatics & Hydraulics
  • BAT Cylinder
  • BAT Wheel Carrier and BAT Wheel
  • ASBS (Anti Skid Braking System)
  • CFME (Continuous Friction Measuring Equipment)
  • Firmware & Software

BAT Cylinder

  • The pneumatically-actuated BAT cylinder is fastened to the frame of the truck and provides a regulated down-force of approx. 2500 pounds to the wheel carrier assembly which engages the runway
  • The down-force is measured utilizing strain-gauges located in the axle of the wheel carrier. This data is logged and eventually contributes to the calculation of braking availability.
  • The BAT cylinder is equipped with an emergency retract feature

BAT Wheel Carrier

  • The BAT wheel carrier is the framework that fastens to the shaft of the BAT cylinder, and it consists of:
    • Custom-designed brake caliper that engages the brake rotor
    • Custom-designed axle (equipped with two internal strain gauges)
    • Custom-designed duct-work/manifolds to rotor for cooling
    • The BAT Wheel assembly
    • Additional sensors: torque-load sensor, horizontal-drag (strain gauge located inside the     axle), infrared temperature sensor to monitor  brake rotor temperature, and wheel speed sensor

BAT Wheel Assembly

  • The BAT wheel assembly consists of:
    • Radial aircraft tire: 18”x4.4”x 12 ply TL tire, Nitrogen-filled at 150PSI
    • Custom fabrication that adapts and fastens the brake rotor into position
    • High performance brake rotor
    • Internal wheel speed sensor components

Aircraft Anti-Skid Brake System (ASBS)

  • Proprietary design
  • Based on late model aircraft braking system
  • Supervisory function to enable test control

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