N747WS

Part: SWITCH — DIRTY (HEATER) · airframe 33,814 hrs · 18,566 cycles

THE PILOT REPORTED A BURNING SMELL IN CABIN DURING FLIGHT. MAINTENANCE INSPECTED AND FOUND THE HEATER FLOW SWITCH DIRTY. THIS WAS CLEANED AND SUBSEQUENT HEATER RUN-UPS PRODUCED NO FURTHER DEFECTS NOTED.

Part: ATTACH FITTING — CORRODED (RT WING) · airframe 33,675 hrs · 18,316 cycles

DURING SCHEDULED MAINTENANCE, A SPOT OF INTERGRANULAR CORROSION WAS VISUALLY IDENTIFIED ON THE RIGHT HAND, UPPER, WING ATTACH FITTING. IT MEASURES APPROXIMATELY .520 INCHES LONG, .064 INCHES DEEP, AND .221 INCHES WIDE. IT IS LOCATED ON THE BOTTOM EDGE OF THE VERTICAL LEG OF THE FITTING AND IS CONSISTENT WITH OTHER CORROSION VISUALLY IDENTIFIED IN THE PAST. THIS FITTING HAS BEEN REMOVED AND WILL BE REPLACED USING NEW PARTS.

Part: SPRING — BROKEN (MASTER CYLINDER) · airframe 31,656 hrs · 15,296 cycles

PILOT REPORTED A LOUD BANG FROM THE RIGHT SIDE WHEEL, A LOSS OF RIGHT DIRECTIONAL CONTROL AND BRAKES, AND THE RIGHT RUDDER PEDAL FELT VERY LOOSE. MAINTENANCE INSPECTED AND FOUND THE RIGHT BRAKE MASTER CYLINDER SPRINGS BROKEN. THE MASTER CYLINDER WAS REPLACED WITH NO FURTHER ISSUES.

Part: FITTING — CRACKED (LT NACELLE) · airframe 31,489 hrs · 15,075 cycles

THE LT NACELLE OB FITTING WAS FOUND TO BE CRACKED AT THE LWR PORTION OF THE IB LEG WHILE PERFORMING INTIAL NDT (HFEC) TO SATISFY REQUIREMENT OF TEXTRON SID 57-10-16. THE FITTING DOES NOT APPEAR TO BE CORRODED OR OTHERWISE DAMAGED AND THERE DO NOT APPEAR TO BE INSTALLATION OR WORKMANSHIP FLAWS. THE CRACK LOCATION AND SIZE ARE CONSISTENT WITH OTHERS WE HAVE IDENTIFIED WITH LIGHTED BORESCOPE TECHNIQUE (MEL54-02R2) TO SATISFY REQUIREMENT OF AD2017-10-09 BUT THIS CRACK WAS NOT IDENTIFIED VISUALLY; LAYERS OF PRIMER PREVENTED PREVIOUS DISCOVERY WITH VISUAL TECHNIQUE. THE FITTING WAS INSTALLED ON 12/07/2007 AS A PORTION OF SERVICE KIT SK402-47B (LOWER WING SPAR CAP MODIFICATION) AND HAS BEEN IN SERVICE FOR 12484.3 HOURS. THE FITTING WILL BE REPLACED WITH NEW OEM PART.

Part: EXHAUST VALVE — BURNED (NR 3 CYLINDER) · airframe 29,690 hrs · 13,553 cycles

PILOT REPORTED THE LEFT ENGINE RUNNING ROUGH, AND CHT SHOWING 175 ON LEFT ENGINE. MAINTENANCE INSPECTED AND FOUND THE LEFT ENGINE CYLINDER NR 3 EXHAUST VALVE BURNED AND THE NR 4 CYLINDER EXHAUST VALVE BROKEN. BOTH CYLINDERS WERE REPLACED WITH NO FURTHER ISSUES.

Part: EXHAUST VALVE — BURNED (NR 4 CYLINDER) · airframe 29,690 hrs · 13,553 cycles

PILOT REPORTED THE LEFT ENGINE RUNNING ROUGH, AND CHT SHOWING 175 ON LEFT ENGINE. MAINTENANCE INSPECTED AND FOUND THE LEFT ENGINE CYLINDER NR 3 EXHAUST VALVE BURNT AND THE NR 4 CYLINDER EXHAUST VALVE BROKEN; BOTH CYLINDERS HAS A TOTAL TIME IN SERVICE OF 1382.2. BOTH CYLINDERS WERE REPLACED WITH NO FURTHER ISSUES.

Part: EXHAUST VALVE — DAMAGED (NR 1 CYLINDER) · airframe 29,376 hrs

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

Part: EXHAUST VALVE — LOW PRESSURE (NR 2 CYLINDER) · airframe 29,316 hrs

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

Part: EXHAUST VALVE — DAMAGED (NR 4 CYLINDER) · airframe 29,316 hrs

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

Part: EXHAUST VALVE — DAMAGED (NR 3 CYLINDER) · airframe 29,248 hrs

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

Part: EXHAUST VALVE — DAMAGED (NR 5 CYLINDER) · airframe 29,111 hrs

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

Part: O-RING — DAMAGED (FUEL SYSTEM) · airframe 28,746 hrs · 12,748 cycles

PILOT REPORTED FUEL SMELL IN COCKPIT. ACCESSED CABIN FUEL LINES & VISUALLY INSPECTED LINES. NO DEFECTS NOTED. LOCATED EVIDENCE OF FUEL LEAK AT THE LT FUEL FILTER BOWL. REPLACED LT FUEL FILTER BOWL O RINGS. PERFORMED OPERATIONAL LEAK CHECK. NO FURTHER LEAKING FROM BOWL NOTED IAW 402C MM 28-20-01.

Part: UNKNOWN — ODOR (CABIN) · airframe 28,715 hrs · 12,722 cycles

PILOT REPORTED FUEL SMELL IN CABIN. RAN ACFT, RAN HEATER & PERFORMED INSPECTION OF FUEL SYS COMPONENTS. AT NO POINT DURING INSPECTION WAS EVIDENCE OR SMELL OF FUEL DETECTED.

Part: LINER — DEFECTIVE (BRAKE SYSTEM) · airframe 28,105 hrs · 12,207 cycles

PILOT REPORTED RT BRAKE DROPPED TO FLOOR AFTER LANDING & A VERY MUSHY FEEL. R & R THE RT BRAKE LINING ASSEMBLY & SERVICED THE HYD SYS IAW CHAPTER 32-40-00. OPERATIONS CHECKED SATISFACTORY AT THAT TIME.

Part: MASTER CYLINDER — LOW (BRAKE SYSTEM) · airframe 27,721 hrs · 11,901 cycles

PILOT REPORTED RT BRAKE INOPERATIVE. INSPECTED RT BRAKE SYS FOR LEAKS IN FUSELAGE, WING, & WW, NONE FOUND. SERVICED RT MASTER CYLINDER & BLED SYS AS PRECAUTION. OPERATIONALLY CHECKED WITH NO DEFECTS NOTED.

Part: BRAKE SYS — CONTAMINATED (MLG) · airframe 27,566 hrs · 11,617 cycles

PILOT REPORTED RT BRAKE INOPERATIVE. INSPECTED, SERVICED & BLED BRAKE SYS. TAXI OPERATIONAL CHECKED GOOD.

Part: ENGINE — FAILED (RIGHT) · airframe 27,394 hrs · 11,324 cycles

RT ENG LOST POWER IN FLIGHT & ENDED UP SHUTTING IT DOWN. THE ACFT LANDED WITHOUT INCIDENT. UPON INSPECTION MX FOUND THE RT ENG CRANK CASE HAD BEEN PENETRATED. INITIAL INVESTIGATION LEADS UP TO BELIEVE A CONNECTING ROD SEPARATED FROM THE CRANKSHAFT. THE ENG HAS BEEN REMOVED & IS BEING SENT FOR TEARDOWN.

Part: DRAG BRACE — CRACKED (NLG) · airframe 24,865 hrs

AT SCHEDULED INSPECTION, NLG DRAG BRACE, OEM 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. THIS UNIT HAS BEEN SCRAPPED & A REPLACEMENT DRAG BRACE HAS BEEN INSTALLED IN ACFT.

Part: CONNECTOR — SHORTED (COCKPIT LIGHTS) · airframe 24,554 hrs

PILOT REPORTED FLIGHT COMPARTMENT LIGHTS INOPERATIVE. SLIGHT ELECTRICAL ODOR NOTED WHEN SELECTED ON. ON MX INSPECTION, SYS WAS INSPECTED AND FOUND POST LIGHT CONNECTOR ABOVE CLOCK SHORTED AND SMOKING. NO OTHER DEFECTS NOTED. R & R POST LIGHT CONNECTOR. OPS CHECKS GOOD.

Part: DRAG BRACE — CRACKED (NLG) · airframe 23,629 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.

Part: DRAG BRACE — CRACKED (NLG) · airframe 23,184 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 WITHIN ALLOWABLE LIMIT OF MEB91-11R1. THIS UNIT HAS BEEN REPAIRED IAW PROCEDURE OUTLINED IN MEB941-11R1 & RETURNED TO SERVICE.

Part: DRAG BRACE — CRACKED (NLG) · airframe 22,745 hrs

AT SCHEDULED INSPECTION, NLG DRAG BRACE, OEM 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 WITHIN ALLOWABLE LIMIT. THIS UNIT HAS BEEN REPAIRED IAW PROCEDURE OUTLINED IN MEB941-11R1 & RETURNED TO SERVICE.

Part: DRAG BRACE — CRACKED (NLG) · airframe 22,524 hrs

AT SCHEDULED INSPECTION, NLG DRAG BRACE OEM 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 WITHIN ALLOWABLE LIMIT. THIS UNIT HAS BEEN REPAIRED IAW PROCEDURE OUTLINED IN MEB941-11R1 & RETURNED TO SERVICE.

Part: DOWNLOCK SWITCH — OUT OF ADJUST (MLG) · airframe 21,816 hrs

ON APPROACH, CREW REPORTED LT MAIN GEAR DOWN AND LOCK INDICATOR FAILED TO ILLUMINATE. COMPLIED WITH EMERGENCY GEAR EXTENSION,STILL NO DOWN LOCK INDICATION, DECLARED EMERGENCY. LANDED WITHOUT INCIDENT. MAINTENANCE ADJUSTED LEFT MAIN GEAR DOWN LOCK SWITCH. COMPLIED WITH LANDING GEAR EXTENSION AND RETRACTION SYSTEM CHECKS, CHECKS OF. AIRCRAFT RELEASED BACK TO SERVICE.

Part: SQUAT SWITCH — INTERMITTENT (LANDING GEAR)

PILOT SELECTED GEAR UP AFTER TAKEOFF. GEAR DID NOT RETRACT. PILOT SELECTED GEAR DOWN AND RETURNED FOR AN UNEVENTFUL LANDING. SQUAT SWITCH INTERMITTENT. (K)

Part: DISTRIBUTOR GEAR — STRIPPED (MAGNETO)

PRE TAKEOFF RUNUP CHECKED GOOD. PULLED ONTO RUNWAY, APPLIED POWER, RT ENGINE BEGAN TO RUN ROUGH. ABORTED TAKEOFF. MAINTENANCE DISCOVERED 10-15 TEETH STRIPPED ON DISTRIBUTOR GEAR. VERY COLD TEMP, PROBABLE CAUSE. (SW01200603303) (K)

Part: CONTROL CABLE — SEPARATED (MIXTURE CONTROL)

START UP, PILOT PUSHED MIXTURE FORWARD, COULD NOT START LEFT MOTOR OR GET FUEL FLOW. INVESTIGATION REVEALLED MIXTURE KNOB WOULD MOVE, ROD END AT MIXTURE CONTROL DID NOT. FOUND CABLE HOUSING SEPARATED FROM FACTORY CRIMP INSIDE FUSELAGE AT CONTROL COLUM AREA.

Part: POST LIGHT — SHORTED (COPILOT PANEL)

PILOT REPORTED SEEING A SMALL AMOUNT OF SMOKE FROM UNDER COPILOT'S INSTRUMENT PANEL AND SMELLING SOMETHING 'ELECTRICAL' BURNING. UPON INSPECTION, A POST LIGHT WAS FOUND SHORTED. NO CIRCUIT BREAKERS TRIPPED. A VERY THIN SPRING INSIDE THE SCREW ON CONNECTOR BURNED THROUGH AND STOPPED CURRENT FLOW. THIS SPRING APPEARS TO BE A CIRCUIT PROTECTION DEVICE.

Part: FLOW VALVE — STICKING (LT WING DEICE)

WING DEICE BOOTS DID NOT FULLY DEFLATE AFTER NORMAL CYCLE. LEFT FLOW VALVE STUCK PARTIALLY OPEN. INSTALLED NEW VALVE. OPS CHECKED NORMAL.