CONTINENTAL GTSIO520–ATA 8520 RECIPROCATING ENGINE POWER SECTION–NUT–CRACKED. DR 611851710
Inspection against SB17-01A on RH engine found broken flanged nut on FWD lower through bolt on # 4 cylinder. IAW SB17-01A. If the flanged nut shows a fracture, remove engine from service and perform an inspection for possible bearing shift according to the Maintenance and Overhaul Manual. Engine has been removed from the airframe to be sent to an overhaul facility.
CONTINENTAL IO520–ATA 7322 FUEL CONTROL/RECIPROCATING ENGINES–INJECTOR–FOULED. DR 611851769
Pilot reported that on climb there was a slight vibration from the engine, but performance was fine with no abnormal engine gauge indications. At about 4000 ft, engine ‘coughed’, and performance was reduced. Aircraft returned for an uneventful landing. Root cause was traced to fouled fuel injectors. All fuel nozzles removed, cleaned and inspected (two found fouled). FCU and flow divider filters cleaned as well. Ground runs carried out. Nil defect evident. Aircraft returned to service.