Date: 202008
Local time of day: 0601-1200
Location: ZZZ.Tower, US
Light: Daylight
Aircraft: B737-700
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Climb
Airspace: Class C ZZZ
ATC / advisory: Tower ZZZ
Aircraft component: Engine
Component problem: Failed
Reporter organization: Air Carrier
Reporter function: Pilot Flying; First Officer
Reporter qualification: Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Second reporter function: Pilot Not Flying; Captain
Anomaly: Aircraft Equipment Problem Critical
Detector: Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Provided Assistance; Flight Crew Landed in Emergency Condition; Flight Crew Inflight Shutdown; Flight Crew Took Evasive Action
Contributing factors: Aircraft
Primary problem: Aircraft

Narrative: After takeoff at approximately 400 ft. AGL; aircraft began to yaw slightly then returned to normal. At approximately 1;000 ft. AGL the aircraft had a more pronounced left yaw again. The Pilot Monitoring identified the #1 Engine Reverser light had illuminated with a slight engine rollback. We leveled off at 2;000 ft. MSL to identify and confirm the malfunction. ATC was notified and we were issued vectors while we ran the QRH Reverser Checklist. Because of the intermittent uncontrolled reverser deployment the #1 engine was shut down using the QRH Engine Failure Shutdown Checklist. We advised ATC and had emergency vehicles meet and inspect the aircraft upon landing. Control of the aircraft was transferred to the Captain. With the engine shut down and secured; we continued to get intermittent reverser deployment indications. The single engine approach and landing were normal. We taxied clear of Runway XXL for inspection. No issues were found with the aircraft so we elected to continue to the gate.


Second narrative: At liftoff; aircraft yawed left at 400 ft. AGL. Flight path returned to normal. At 1;000 ft. AGL aircraft yawed left again and #1 REV alert illuminated on upper MFD. PM (Pilot Monitoring) identified the alert. Told Tower we were experiencing an engine malfunction and wished to remain in the area to work our problem. Eventually switched to a priority Tower frequency and flew a box pattern. Cleaned up aircraft on schedule. Called for QRH Reverser Unlock procedure. Reduced thrust REV light went out. Began to prepare for air return. Told Tower our intentions and time requirements. Briefed Flight Attendants and Passengers. Communicated with Dispatch and requested landing data. Thrust REV alert illuminated again with rollback and yaw. Consulted QRH and led to Engine Inflight Shutdown Checklist. Transferred control to Captain.Advised ATC and asked for emergency equipment. Completed Engine Inflight Shutdown Checklist and requested vectors to ILS XXL.Completed One Engine Inoperative Checklist. Landed without incident. Emergency equipment inspected the aircraft and it looked normal. Emergency equipment followed aircraft to the gate. Completed Parking Checklist. Called Dispatch; Maintenance Control. Spoke to Dispatch Supervisor and Chief Pilot. First Officer and Contract Maintenance inspected #1 engine. No evidence of damage.


Synopsis: B737 flight crew reported an engine failure and return to airport.