Incident Overview
On 27 January 2012, an Embraer E170-100 aircraft, operating a flight approaching Katowice Airport (EPKT), encountered a landing gear extension anomaly. During the approach, after the landing gear lever was moved to the down position, the left main landing gear did not deploy. The EICAS screen displayed a "GEAR LEVER DISAGREE" message.
Crew Actions
In response to the indication, the crew performed a go-around procedure and executed the "LDG LEVER DISAGREE" checklist. While at the assigned flight level during the missed approach, the landing gear was extended successfully. The aircraft then landed without further incident.
Maintenance Findings
Following the landing, maintenance personnel conducted tests in accordance with the manufacturer's procedures. The tests revealed a malfunction of the left main landing gear locking system.
Investigation and Conclusion
The investigation into the incident was carried out by the operator, and the results were presented to the State Commission on Aircraft Accident Investigation (Państwowa Komisja Badania Wypadków Lotniczych). The commission reviewed the findings and decided to close the investigation without issuing any safety recommendations.
Probable Cause
The probable cause of the incident was determined to be a malfunction of the left main landing gear locking system.