EMB ERJ 145 ER/LR
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe
Flight Crew Landed in Emergency Condition
Aircraft
While on the arrival two EICAS messages appeared; Stall Protection System (SPS) ADVANCED and FLAP LOW SPEED; as well as no indications of flap position. Below 250KIAS; the Captain and I decided to position the flap lever to the 9 degrees position to see if there was any movement or no indication. With still no flap indication; we called our flight attendant to have her check out the windows to see if the flaps had changed position; she called back to say the flaps had not moved. Captain flew the airplane; and I proceeded to run through the QRH for flap failure at 0 degrees. I [let] ATC [know about our] flight control failure of the flaps; and asked for delay vectors. The Captain and I briefed our flight attendant; the company (dispatch/maintenance); and the passengers about the situation. Once we were ready; we asked ATC to return to the airport. The Captain flew the ILS approach; [and] landed with no further issues. I notified ATC that we would require no further assistance; and we taxied into the gate.The aircraft was in an undesired state to land with the flaps stuck at 0 degrees. After calculating landing distance with the ACARS with a QRH landing distance penalty applied; the captain and I determined that the runway length suitable to land as safely as possible in the undesired aircraft state.
EMB-145LR First Officer reported flap failure resulting in a successful zero flap approach and landing.