What was found
DURING RUN-UP FOR FLT, CREW NOTICED WHAT THEY DESCRIBED AS A BURNING ODOR. NO OTHER ABNORMAL INDICATIONS OBSERVED. ACFT SHUTDOWN NORMALLY, MX WERE NOTIFIED & ACFT WAS TAKEN OOS. DETAILED INSPECT OF COCKPIT WIRING & ELECT CONNECTIONS CONDUCTED. ACFT WAS CHARGED FOR APPROX 3 HRS USING CHARGING CART. ACFT WAS RUN AT IDLE FOR 3 MINS, FLT FOR 3 ADDITIONAL MINUTES. NO BURNING ODOR WAS NOTICED. ACFT CLEARED FOR A POST-UNSCHEDULED MAINT FLT. FLT CONDUCTED & LASTED 13 MINUTES. ALL ACFT SYS WERE TURNED ON & UTILIZED AS NORMAL THROUGHOUT THE DURATION OF THE 13-MINUTE FLT, NO BURNING ODOR OBSERVED. ARCT RETURNED TO SERVICE.