Approach and Landing
During arrival, a thunderstorm with lightning was present over the airport, prompting the aircrew to hold for approximately 7 to 10 minutes. After a Beech Baron had landed, the crew commenced an ILS approach. On final approach, an 8 to 10 degree crab was required to compensate for the wind. The first officer was flying the aircraft. He reported that wind shear was encountered at about 50 to 100 feet above ground level, but only slight rudder input was needed to straighten the aircraft.
A normal touchdown was achieved. After touchdown, speed brakes and reverse thrust were used. The aircraft then veered left, and reverse thrust was cancelled. The first officer reported that rudder and brakes were applied, but braking was nil. He attempted reverse thrust again.
Runway Excursion
Subsequently, the aircraft departed the right side of the runway. Scrubbing marks were found from approximately 1300 to 3500 feet down the runway, indicating the point at which directional control was lost.
Runway Conditions
The runway was not grooved. Additionally, the runway had a gradient of less than the 1 percent recommended by FAA Circular AC No: 150/5325-2C. These conditions may have affected braking performance.
No further details regarding the aircraft, occupants, or damage were provided in the source.