Regional Jet 200 ER/LR (CRJ200)
Maintenance Airframe; Maintenance Powerplant
Aircraft Equipment Problem Critical; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
General Maintenance Action
Aircraft
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.
CRJ200 Maintenance Technician reported an APU fire was observed during aircraft tow.