Date: 201911
Flight conditions: VMC
Aircraft: B737 Next Generation Undifferentiated
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Final Approach
Aircraft component: Trailing Edge Flap
Component problem: Malfunctioning
Reporter organization: Air Carrier
Reporter function: Pilot Not Flying; First Officer
Reporter qualification: Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Human factors: Troubleshooting; Situational Awareness; Distraction
Anomaly: Aircraft Equipment Problem Critical
Detector: Person Flight Crew
When detected: In-flight
Result: Flight Crew Landed in Emergency Condition; Flight Crew Overcame Equipment Problem
Contributing factors: Airport; Aircraft
Primary problem: Aircraft

Narrative: While joining the ILS at ZZZ we experienced a leading edge flap transit warning. As Pilot Monitoring; I immediately pointed the warning to the Pilot Flying and reached for QRH. While I began the appropriate QRH procedure the Pilot Flying continued the approach. At this point I believed this was safest course of action as we were already in the valley between the mountains. I told the Pilot Monitoring there was no way to complete the procedure during the approach and we agreed to go missed. Because of our flap issue we could not perform the full missed approach procedure; flaps were locked less than 1. Once established outbound to the hold I continued the QRH. The Leading Edge transit lead me to several other procedures. We were able to extend the Leading Edge devices; but trailing edge flaps were locked and asymmetrical. Left flap at 1/4 and right flap about 1. We both agreed in the asymmetry. We ran the final QRH checklist (trailing edge flap up) because the left and right flaps indicated less than 1; test the flight attendants; [advised ATC] and performed approach to landing with the Leading Edge devices extended and the trailing edge devices indicating less than 1 degree. The landing was in the touchdown zone and on centerline. We exited at Taxiway Delta and requested airport fire rescue examine the brakes and landing gear. The scene commander determined due to our brake temperature we could not park at the gate. We were escorted to a remote stand. Fans were placed around the main gear and once the brakes reached a safe temp passengers were deplaned via air stairs and bussed to the main terminal. We completed our post flight duties; contacted Maintenance; Dispatch and the Chief Pilot. A transmitter breaker popped was determined to have been the cause of the malfunction.Lastly our decision to land in ZZZ was influenced by several factors. Limited options in the area; ZZZ1; ZZZ2 or ZZZ3 and weather. While ZZZ has its challenges due to terrain and optical illusions I believe it was the best runway given our situation. My first choice would have been ZZZ2; but we were down to 7;000 lbs. of fuel and with the leading edge devices deployed; I feel we would have burned too much fuel en-route and would have painted ourselves into a corner in ZZZ2. ZZZ1 runway is to rough for the high Vref and ZZZ3 had weather in the area.




Synopsis: A Boeing 737 pilot reported a trailing edge flap malfunction which resulted in the flaps being locked out in a slightly asymmetrical position.