LYCOMING O540–ATA 8520 RECIPROCATING ENGINE POWER SECTION–CRANKCASE–CRACKED. DR 611852252 (image above)
Oil leak detected during operations tracing back to the lower FWD side of cylinder #2. On removal of propeller and baffling, crack found in the crankcase. Engine to be removed and sent to approved repair facility.
LYCOMING IO540 AA1A5–ATA 8520 RECIPROCATING ENGINE POWER SECTION–BEARING–FAILED. DR 611852273
Surface of main bearing had failed. Bearings have an aluminium/tin bearing surface that have had reliability issues.
LYCOMING TIO540 J2BD–ATA 8520 RECIPROCATING ENGINE POWER SECTION–EXHAUST VALVE–WORN. DR 611852277 (image above)
Pilot reported occasional high EGT readings on LH engine #4 cylinder. Inspection revealed a worn exhaust valve guide and carbon deposits in rocker area. Additionally, #3 cylinder was found to be exhibiting similar wear & carbon deposits. Cylinders are being replaced.
CONTINENTAL GTSIO520 K–ATA 8520 RECIPROCATING ENGINE POWER SECTION–CYLINDER–Oil leak. DR 611852281 (image above)
Engine rough running. Number 4 cylinder found to be parted from barrel. New cylinder will be installed.
LYCOMING TIO540 AJ1A–ATA 7810 ENGINE COLLECTOR/TAILPIPE/NOZZLE–NUT–LOOSE. DR 611852286
During completion of Lycoming SB627E (exhaust inspection), exhaust flange nuts were found to be loose. Exhaust nuts re torqued IAW SB627E. Lycoming engines informed.
LYCOMING O320 B2C–ATA 8520 RECIPROCATING ENGINE POWER SECTION–EXHAUST VALVE–LEAKING. DR 611852303
Number 3-cylinder leak-down test resulted in figures of 66/80 PSI. Cylinder removed from aircraft and disassembled for inspection. Exhaust valve found to be tuliped & associated valve guide slightly elongated allowing valve to become unseated. Valve and guide replaced with new items, cylinder re-fitted to aircraft.
LYCOMING O360 J2A–ATA 8520 RECIPROCATING ENGINE POWER SECTION–EXHAUST VALVE–WORN. DR 611852305
Cylinder leak down test resulted in figures of 15/80 psi. Defect traced to worn exhaust valve guide and valve. Replace cylinder assembly.
CONTINENTAL GTSIO520 M–ATA 7421 SPARK PLUG/IGNITER–SPARK PLUG–Ceramic broke. DR 611852307 (image above)
Two spark plugs (L/H engine #4 bottom and L/H engine #3 top) found to have broken massive electrode insulators during scheduled 100-hourly inspection. No rough running or other symptoms were noticed prior to check or during pre-check engine runs. Compression checks, cylinders borescope completed, nil defects evident. Moreover, oil filter, exhaust turbine inspected, new spark plugs installed.
LYCOMING O540 F1B5–ATA 8520 RECIPROCATING ENGINE POWER SECTION–CYLINDER–LOW COMPRESSION. DR 611852323
Failed compression check. Valve seat and face eroded. Necessary rectifications underway.
LYCOMING O360 J2A–ATA 8520 RECIPROCATING ENGINE POWER SECTION–Fan wheel–CRACKED. DR 611852336
Cooling fan and associated scroll assembly removed to carry out scheduled inspection and lubrication of lower bearing assembly. Inspection of the fan shaft found the presence of what appeared to be a watermark emanating from the outboard mounting surface of the bearing inner race. Fan shaft bearing assembly was removed/inspected and found to have nil defects evident at this time. Inner taper of associated cooling fan closely inspected and found to be cracked in one place. New fan wheel fitted and aircraft returned to service.