What happened
During the landing phase of the flight, the crew reported that the approach and touchdown proceeded without incident. However, as the aircraft reached approximately 2,000 feet into the landing roll, the braking system failed to function effectively. This loss of deceleration caused the aircraft type to continue moving past the end of the runway. The aircraft subsequently traveled down an embankment, crossed a four-lane roadway, and eventually stopped in a drainage ditch.
Findings
An investigation into the mechanical state of the aircraft revealed significant issues with the landing gear components. Specifically, three of the four brake assemblies were found to be worn past the permitted safety limits. Additionally, all four antiskid wheel generators were failing to produce the required voltage levels.
These electrical deficiencies directly impacted the landing roll; the low voltage from the wheel generator caused the antiskid system to become inoperative, which led to the failure of the outboard right main tire. Notably, the aircraft had undergone an A-1 through A-6 inspection only two days prior to the event, marking this as the first flight following that maintenance period. The A-5 inspection protocol specifically includes the examination of brake assemblies for wear and leaks.