Bombardier challenger 650 flight crew reported a failure of the horizontal stabilizer trim.

Attributes
ACN	1575170
Time
Date	201809
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Challenger 650
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Horizontal Stabilizer Trim
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Person 2
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

Cruising at 4000 feet and 250 knots; stab trim and associated mach trim amber cas messages displayed. Unable regain control of stabilizer trim. Diverted [and] landed with reduced flap setting per [the handbook]. Min speed to maintain elevator pitch control 150 knots.

Original NASA ASRS Text

Title: Bombardier Challenger 650 flight crew reported a failure of the horizontal stabilizer trim.

Narrative: Cruising at 4000 feet and 250 knots; stab trim and associated Mach trim amber CAS messages displayed. Unable regain control of stabilizer trim. Diverted [and] landed with reduced flap setting per [the handbook]. Min speed to maintain elevator pitch control 150 knots.

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.