N5826C

Part: BEAM — CRACKED (LT NACELLE) · airframe 37,263 hrs · 11,001 cycles

DURING MAINTENANCE A CRACK WAS VISUALLY IDENTIFIED ON THE AFT SIDE OF THE LEFT NACELLE CROSSOVER BEAM (P/N: 5654104-11). THIS CRACK MEASURES APPROXIMATELY 2.00 INCHES IN LENGTH, AND BEGINS AT THE TOP INBOARD TURBO BRACKET MOUNTING HOLE ON THE AFT FACE OF THE BEAM. THIS CRACK IS CONSISTENT WITH OTHERS FOUND IN THIS AREA AND IS NOT VISIBLE WITH THE TURBO MOUNTING BRACKET INSTALLED. THIS BEAM WILL BE REMOVED AND REPLACED USING NEW PARTS.

Part: EXHAUST VALVE — BROKEN (NR 2 CYLINDER) · airframe 35,102 hrs · 8,567 cycles

PILOT REPORTED LEFT ENGINE RUNNING ROUGH IN CRUISE. MAINTENANCE INSPECTED AND FOUND THE NUMBER TWO CYLINDER EXHAUST VALVE BROKEN AND PUSHROD BENT. ENGINE HAS BEEN REMOVED FOR TEARDOWN ANALYSIS; FURTHER DETAIL WILL BE PROVIDED UPON RECEIPT OF TEARDOWN REPORT.

Part: EXHAUST VALVE — DAMAGED (NR 2 CYLINDER) · airframe 34,544 hrs

CYLINDER REMOVED DUE TO LOW COMPRESSION AT INSPECTION. EXHAUST VALVE DISPLAYS EVIDENCE OF HEAT DAMAGE.

Part: EXHAUST VALVE — DAMAGED (NR 4 CYLINDER) · airframe 34,544 hrs

CYLINDER REMOVED DUE TO LOW COMPRESSION AT INSPECTION. EXHAUST VALVE DISPLAYS EVIDENCE OF HEAT DAMAGE.

Part: EXHAUST VALVE — DAMAGED (NR 1 CYLINDER) · airframe 344,367 hrs

CYLINDER REMOVED DUE TO LOW COMPRESSION AT INSPECTION. EXHAUST VALVE DISPLAYS EVIDENCE OF HEAT DAMAGE.

Part: EXHAUST VALVE — DAMAGED (NR 6 CYLINDER) · airframe 34,240 hrs

CYLINDER REMOVED DUE TO LOW COMPRESSION AT INSPECTION. EXHAUST VALVE DISPLAYS EVIDENCE OF HEAT DAMAGE.

Part: GOVERNOR — DEFECTIVE (LT ENGINE) · airframe 33,020 hrs · 6,739 cycles

PILOT REPORTED LT PROPELLER SPEED ERRATIC & DIFFICULT TO CONTROL. PERFORMED A RUN UP & PROP RIGGING FOR FULL POWER, CLIMB POWER RPM CHECK. THE REPLACED & OPERATIONALLY CHECKED THE PROP GOVERNOR WITH NO FURTHER DEFECTS NOTED.

Part: ESCAPE HATCH — OPEN (COCKPIT) · airframe 32,876 hrs · 6,608 cycles

PILOT REPORTED ON DESCENT CREW HATCH OPENED FWD SAFETY LATCH PREVENTED IT FROM OPENING COMPLETELY. VISUALLY INSPECTED CREW DOOR. CLEANED & LUBRICATED LOCKING MECHANISM. NO DEFECTS FOUND. OPERATIONS CHECKED GOOD.

Part: EXHAUST VALVE — BROKEN (RT ENGINE) · airframe 32,713 hrs · 6,469 cycles

WHILE IN CRUISE POWER, COULD FEEL AN ENG STARTING TO RUN ROUGH. UNTIL THE RT OIL PRESS & RT CYLINDER HEAD TEMPERATURE STARTED TO DROP HE WAS UNSURE WHICH SIDE. IT WAS APPROX 3 - 4MIN FROM WHEN HE FIRST FELT THE ROUGHNESS UNTIL THE RT ENG OIL PRESS & CYLINDER HEAD TEMPERATURE STARTED TO DROP. THE OIL PRESS DID FALL TO 0 & THE ENG WAS SHUTDOWN. IT WAS ALSO REPORTED BY A PAX THAT THERE WERE SPARKS COMING FROM THE BACK OF THE ENG. AN EMER WAS DECLARED & THE PLANE LANDED SAFELY. INITIAL INVESTIGATION INDICATES A BROKEN EXHAUST VLV IS THE SOURCE OF THE PROBLEM. MX IS ON SITE. THE ENG IS BEING R & R, SENT FOR TEARDOWN.

Part: WIRE — DAMAGED (COCKPIT) · airframe 31,725 hrs · 5,609 cycles

SMOKE FROM WIRES LEADING TO WINDSHIELD, WHERE CONNECTS TO CONTROL PEDESTAL.

Part: PUMP — FAULTY (RT ENG FUEL) · airframe 30,973 hrs · 4,655 cycles

RT ENGINE POWER LOSS AND LOSS OF FUEL FLOW IN CRUISE POWER SETTING. PUMP FOUND FAULTY.

Part: DRAG BRACE — CRACKED (NLG) · airframe 28,380 hrs

AT SCHEDULED INSPECTION, NLG DRAG BRACE, PN 5142002-5, WAS FOUND TO BE CRACKED IN THE AREA OF NLG ACTUATOR ATTACH POINT. METHOD OF INSPECTION WAS DYE PENETRANT. THIS CRACK WAS FOUND TO BE BEYOND LIMIT ALLOWABLE OF MEB91-11R1. THIS UNIT HAS BEEN SCRAPPED & A REPLACEMENT DRAG BRACE HAS BEEN INSTALLED IN ACFT.