What was found
PILOT REPORTED IN-FLIGHT: NOSE GEAR WILL NOT EXTEND NORMALLY, FLY-BY, TOWER VERIFIED NOSE GEAR NOT DOWN. EMERGENCY GEAR EXTENDED, ALL GEAR EXTENDED, SAFE LANDING. FINDINGS: EXHAUST STUD FROM NR 4 CYLINDER FELL OUT AND LODGED IN HINGE SLOT FOR NOSE GEAR DOORS PREVENTING GEAR FROM EXTENDING NORMALLY. COWLING AFT MOUNT DAMAGED, BUT REPAIRABLE. LOGS SHOWED NR 4 EXHAUST GASKET PREVIOUSLY REPLACED. NUT STILL ATTACHED TO STUD AND HELICOIL ON THREADS.