Runway Overrun Due to Anti-Skid System Failure (N699BG)

Incident Overview

During the final approach to landing, the anti-skid system test required a second attempt to obtain the correct indication. Upon touchdown, the co-pilot deployed the spoilers and thrust reverser. When the wheel brakes were applied, the airplane began to drift left of the centerline. The pilot reported that the wheel brakes did not appear to be effective, but he was able to maintain directional control. The airplane slowed but did not stop until it overran the runway and encountered an engineered materials arresting system (EMAS).

Investigation Findings

A post-incident functional test of the landing gear system was conducted in both ground and flight configurations. During the in-flight functional test, a malfunction in the right main landing gear brakes anti-skid system was detected. The anti-skid system was removed, and a separate functional test was performed. Examination of the system components revealed that the SPAD (Advanced Anti-Skid System) controller was the origination of the brake failure. The controller was replaced, and another functional test was conducted. The anti-skid system passed all functional tests, and the airplane was returned to service.