EMB ERJ 190/195 ER/LR
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Returned To Departure Airport; General Declared Emergency; General Maintenance Action
Aircraft
On takeoff roll at approximately 100 KIAS the left engine LP VIB indicated amber 4.6. The QRH procedure for abnormal engine vibrations was completed and the maximum N1 possible was 60% N1. We advised departure we would be returning to the airport. I briefed the flight attendants via interphone of the reason for the return; and advised it would be a normal landing. I then briefed the passengers of the general nature of the situation. Finally I advised Dispatch via ACARS and; as a precaution; declared an emergency with approach. We completed the Engine-out Descent Approach and the Engine Out landing checklists as a precaution in the event the vibrations increased and shutdown of the engine was required. After landing we advised the Tower that no further assistance was required; and taxied the aircraft to the gate where we made a log entry. Maintenance later informed us a chip detection message was indicated on the maintenance pages.
An ERJ-190 flight crew declared an emergency and returned to their departure airport after receiving amber level vibration from the left engine.