Incident Overview
On 24 August 2015, an Embraer 190 aircraft was conducting an approach to Frankfurt am Main Airport (EDDF). During the descent, the monitoring pilot (PM) mistakenly moved the flap lever from position 0 to position 1 without receiving a command from the pilot flying (PF). This action triggered an overspeed warning in the cockpit.
Sequence of Events
The incident occurred while the aircraft was descending from 4,000 feet to 3,000 feet, with airspeed reducing from 240 knots to 210 knots. Upon activation of the overspeed warning, the monitoring pilot immediately returned the flap lever to position 0, and the pilot flying reduced the rate of descent. The maneuver was completed without further incident.
After landing, the crew notified the Maintenance Control Center (MCC) of the event. A special inspection was carried out in accordance with Aircraft Maintenance Manual (AMM) 05-50-07 Revision 22, after which the aircraft was cleared for continued operation.
Investigation Findings
Analysis of flight data recorder information confirmed that the flaps remained in position 1 for approximately seven seconds. The investigation determined that the crew did not follow standard operating procedures (SOP). The official cause of the incident was stated as noncompliance with SOP by the crew.
Safety Recommendations
No safety recommendations were issued by the investigating authority.