What happened
On July 1, 2016, a Boeing 787-800 operating out of Warsaw Chopin Airport (EPWA) encountered a technical malfunction during flight. The flight crew reported an issue regarding the speed limit indicator, which was displaying an error while the landing gear was extended. Due to this technical discrepancy, the crew decided to abort the flight and return to the departure airfield.
Prior to landing, the aircraft performed a fuel jettison to reach a safe landing weight. The aircraft subsequently completed a landing maneuver and arrived safely at the airport.
The investigation
The investigation focused on the cause of the erroneous speed limit warning appearing during the landing gear extension phase. The investigation established that the warning was triggered by the specific position of a cockpit switch.
Findings
- The primary cause of the incident was the position of the speed limit warning switch, which had been set to "GEAR DOWN."
- The technical issue resolved itself once the crew moved the switch back to the "NORM" position.