Cl-300 flight crew reported receiving an APU fire warning on descent into their destination.

Attributes
ACN	1419702
Time
Date	201701
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	Challenger 300
Operating Under FAR Part	Part 135
Flight Phase	Descent
Flight Plan	IFR
Component
Aircraft Component	APU
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

APU fire warning; cas (crew alert system) message; triple chime. Aircraft warning system; cas message; very slight odor. Cause unknown; possible APU fire. I called for emergency memory items for APU fire warning; maintained control of aircraft; and took control of radios

Original NASA ASRS Text

Title: CL-300 flight crew reported receiving an APU fire warning on descent into their destination.

Narrative: APU fire Warning; CAS (Crew Alert System) message; triple chime. Aircraft Warning system; CAS message; very slight odor. Cause unknown; possible APU fire. I called for emergency memory items for APU fire warning; maintained control of aircraft; and took control of radios

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.