B737 flight crew reported an electrical trim malfunction on short final.

Attributes
ACN	1651382
Time
Date	201905
Local Time Of Day	1201-1800
Place
Locale Reference	BOI.Airport
State Reference	ID
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Landing
Flight Plan	IFR
Component
Aircraft Component	Horizontal Stabilizer Trim
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 202 Flight Crew Total 3600
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 197 Flight Crew Type 2095
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

At approximately 1;500 feet AGL; while attaining final flap configuration; the nose up trim quit working. I asked the capt to try his trim switch to see if it would trim nose up and it would not. I bumped it forward to see if that worked and it did. The aircraft was a little nose heavy; but still fully controllable; so I elected to continue and land instead of going around and asking the capt to try and trim manually during another approach. The flare and landing required more back stick force than usual due the out of trim condition; but it was completely controllable and the landing was normal. We submitted a maintenance write up; and I believe the capt followed it up with a verbal to [maintenance control and required company notifications.]

Original NASA ASRS Text

Title: B737 flight crew reported an electrical trim malfunction on short final.

Narrative: At approximately 1;500 feet AGL; while attaining final flap configuration; the nose up trim quit working. I asked the Capt to try his trim switch to see if it would trim nose up and it would not. I bumped it forward to see if that worked and it did. The aircraft was a little nose heavy; but still fully controllable; so I elected to continue and land instead of going around and asking the Capt to try and trim manually during another approach. The flare and landing required more back stick force than usual due the out of trim condition; but it was completely controllable and the landing was normal. We submitted a maintenance write up; and I believe the Capt followed it up with a verbal to [Maintenance Control and required company notifications.]

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.