CRJ200 maintenance technician reported an APU fire was observed during aircraft tow.

Attributes
ACN	1586779
Time
Date	201810
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Dawn
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Component
Aircraft Component	APU
Person 1
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Events
Anomaly	Aircraft Equipment Problem Critical Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

While the aircraft was being towed and I received the signal; I started the APU in accordance with crj 200 [maintenance procedure]. The egt was around 350 but the RPM only went to 24. [Maintenance personnel] opened the door and told me to shutdown; we have an APU fire. (No fire indication was indicated on displays) I properly shutdown; set brakes; and got out of the aircraft.

Original NASA ASRS Text

Title: CRJ200 Maintenance Technician reported an APU fire was observed during aircraft tow.

Narrative: While the aircraft was being towed and I received the signal; I started the APU in accordance with CRJ 200 [Maintenance Procedure]. The EGT was around 350 but the RPM only went to 24. [Maintenance personnel] opened the door and told me to shutdown; we have an APU fire. (No fire indication was indicated on displays) I properly shutdown; set brakes; and got out of the aircraft.

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.