What was found
WHEN DEPARTING DCA, ACFT VIBRATED BAD. NR 1 PROP, NR 2 BLADE DAMAGED. NR 1 ENG REQUIRES VISUAL INSP OF 1ST STAGE IMPELLER FOR EVIDENCE OF SOFT OR HARD MATERIAL INGESTION. NR 1 PROP NR 2 BLADE REQUIRES SB14SF-61-118 PERFORMED BEFORE REVENUE FLIGHT. INSPECTED AND FOUND NICKLE SHEATH MISSING FROM NR 1 PROP NR 4 BLADE. REMOVED AND REPLACED NR 1 PROP NR 2 BLADE, OPS CHECK AND LEAK CHECK GOOD. INSPECTION COMPLETE, NO DEFECTS NOTED. ACFT FERRIED.