What was found
APU FAIL DURING START AT GATE, GROUND CREW REPORTS 2' FLAME BRIEFLY (APU INOPERABLE). REMOVED FROM SERVICE. NO PRESENT FAULTS IN CDS. 12-2,133-2,102-3,110-0054-2 AND 053-2 UNDER HISTORICAL FAULTS. C/W VISUAL INSPECTION OF APU COMPARTMENT, REF Q400 HS NR 49-0008, NO DEFECTS NOTED. PERFORMED OPERATIONAL TEST OF APU, IAW Q400 AMM TASK 49-00-00-710-801. OPERATIONAL TEST GOOD, NO DEFECTS NOTED, THIS CLEARS MEL 49-00-1. DEFERRAL PLACARDS REMOVED. NO CDS FAULTS NOTED AFTER OPERATIONS TEST. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.