Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Confusion; Troubleshooting
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Flight Crew Overcame Equipment Problem; Flight Crew Landed As Precaution; General Maintenance Action; General Flight Cancelled / Delayed
Aircraft
Descending into ZZZ we started to smell a hot electrical smell. As we descended on the arrival the smell did not go away and the stab trim started trimming 2 rotations nose down; two rotations nose up. The trim always returned back to its original position. Once we configured flaps 5 the aircraft stopped trimming. There was no abnormality to the way the aircraft was flying. We did not exercise Priority Authority and landed without event. We wrote up issue up and explained to the mechanics what had taken place.
B737-800 Captain reported an electrical smell in the cockpit during descent. The Captain reported the stabilizer trim began to make uncommanded trim inputs until flaps were lowered to 5 degrees. The Captain elected to continue the approach to landing.