What was found
AIRCRAFT N334QT DEPARTED FROM MDE STATION, AND DURING CLIMB, LOW OIL QUANTITY AND LOW OIL PRESSURE INDICATIONS WERE OBSERVED FOR ENGINE NUMBER 1. AS A RESULT, THE FLIGHT CREW PERFORMED AN IN-FLIGHT SHUTDOWN OF THE AFFECTED ENGINE AND RETURNED TO MDE. DURING MAINTENANCE CHECKS, THE ACCESSORY GEARBOX DRAIN PLUG ON ENGINE NUMBER 1 WAS FOUND TO BE LOOSE, A CONDITION THAT RESULTED IN OIL LOSS DURING FLIGHT. IT IS IMPORTANT TO NOTE THAT THE AIRCRAFT HAD JUST UNDERGONE MAINTENANCE, DURING WHICH THE ENGINE NUMBER 1 OIL PUMP WAS REPLACED. AN INVESTIGATION IS CURRENTLY UNDERWAY TO DETERMINE THE CAUSE OF THE LOOSE DRAIN PLUG, AS THIS PLUG IS NOT REQUIRED TO BE REMOVED AS PART OF THE OIL PUMP REPLACEMENT PROCEDURE.