Incident Overview
On September 19, 2014, an Embraer ERJ 135 encountered an overspeed event during cruise at flight level 410. The indicated airspeed (IAS) suddenly increased, triggering a Master Warning HIGH SPEED alert. The aircraft exceeded the maximum allowable speed by approximately 5 knots for about 11 seconds.
Probable Cause
The probable cause of the speed exceedance was the crew maintaining a small margin between the flight speed and the maximum allowable speed under the prevailing and forecast flight conditions, which included turbulence.
Preventive Actions
The operator briefed its flight crews on the circumstances of the incident. The aircraft manufacturer was informed and permitted the aircraft to operate for 10 cycles pending analysis of the flight data recorder (FDR). After reviewing the FDR data, no additional inspection of the aircraft was deemed necessary.
Safety Recommendations
The investigation commission did not issue any safety recommendations.