What happened
On March 19, 2016, an Embraer ERJ-190 operated by PLL LOT SA departed from Warsaw Chopin Airport (EPKK) bound for Warsaw Chopin Airport (EPWA). At 14:11 UTC, shortly after reaching V1 speed during the takeoff roll, the flight crew experienced a sudden vibration. Suspecting a potential tire burst, the pilot requested a runway inspection to check for debris or tire fragments.
Following the inspection of the runway by airport ground services, no debris, tire fragments, or foreign objects were found. The crew also reported no visible obstructions or aircraft malfunctions during the takeoff sequence. Upon landing at the destination, a thorough inspection of the landing gear was conducted, which revealed no irregularities or damage.
The investigation
The investigation focused on analyzing flight data and physical evidence to determine the source of the vibration. A review of the Digital Video Data Recorder (DVDR) revealed that at a speed of approximately 130 knots, the rudder force increased by about 100 lbs to the right. Crucially, the data showed no discrepancy in wheel rotational speeds, indicating that tire pressures remained constant and no tire failure had occurred.
Findings
- The investigation established that the vibration was caused by unintended and unrecognized rudder pedal input by the flying pilot.
- The pilot could not definitively recall whether excessive rudder deflection had been applied during the takeoff roll.
- No mechanical failures, tire issues, or runway obstructions were present.