LYCOMING O540 F1B5–ATA 8530 RECIPROCATING ENGINE CYLINDER SECTION–EXHAUST VALVE–WORN. DR 611751175
In removed cylinder, exhaust valve inspection carried out, valve seat found to be serviceable/repairable however exhaust valve was prematurely worn/stepped. Valve removed from service, valve seat re-cut and new fitted. Low hour removal is suspected to be caused by poor material or manufacturing process.
LYCOMING O235–ATA 7322 FUEL CONTROL/RECIPROCATING ENGINES–CARBURETTOR–SUSPECT FAULTY. DR 611851300
Engine failed to accelerate past 1900 rpm. Suspected internal fault in carburettor. Awaiting result of internal inspection.
LYCOMING O360 A4M–ATA 8520 RECIPROCATING ENGINE POWER SECTION–PISTON ENGINE–CONTAM-METAL. DR 611851311
Metal contamination in oil filter. Probably cam shaft failure, engine removed for overhaul.
LYCOMING IO360 A1B6–ATA 7322 FUEL CONTROL/RECIPROCATING ENGINES–FCU–Off schedule. DR 611851364
LH engine did not deliver full power. It was delivering a fixed power with fuel flow of 8 USG/hr. After troubleshooting, engine delivered only 1400 RPM when pilot elected to feather and shutdown engine. Defect was traced to faulty fuel control unit. Same replaced by approved MRO.
LYCOMING IO540 K1A5–ATA 7421 SPARK PLUG/IGNITER–SPARK PLUG–Ceramic broke. DR 611851378 (photo above)
On a scheduled check, two spark plugs were found to have cracked ceramics. All affected plugs have been champion massive electrode plugs.
LYCOMING TIO540 J2BD–ATA 7810 ENGINE COLLECTOR/TAILPIPE/NOZZLE–EXHAUST PIPE–CRACKED. DR 611851383 (photo above)
Crack starting from weld for waste gate pipe interface with tailpipe. Replaced with serviceable tailpipe.
LYCOMING IO540–ATA 7421 SPARK PLUG/IGNITER–SPARK PLUG–Ceramic broke. DR 611851388 (photo above)
In cruise, pilot noticed a drop in oil pressure. An oily mist was seen at the back of the engine as well. Engine was shut down and landing made. During troubleshooting, # 6 cylinder was found to have no compression. A burnt hole was observed in the piston head. Top spark plug ceramic was noted to be split and protruding down into the cylinder pointing to the hole in the piston. Moreover, there were fine pieces of metal in the filter. New cylinder kit installed.
LYCOMING IO540 E1B5–ATA 7421 SPARK PLUG/IGNITER–SPARK PLUG–Ceramic broke. DR 611851398
Found six cracked spark plugs ceramics on L/H engine. Investigation is in progress.
LYCOMING O235 L2C–ATA 8530 RECIPROCATING ENGINE CYLINDER SECTION–STUD–SHEARED. DR 611851410
Sheered cylinder base hold down stud. No symptoms, found during periodic insp. Stud replaced.
LYCOMING IO540 K1A5–ATA 7421 SPARK PLUG/IGNITER–SPARK PLUG–Ceramic broke. DR 611851451 (photo above)
Pilot reported massive rpm drop on # 4 cylinder. Maintenance assessment was c/o and four spark plugs were found to be faulty. Plugs centre electrode ceramic insulation was broken off whereas # 6 cylinder bottom plug had hairline crack. All spark plugs were replaced.