N4112K

Part: INSERT — BENT (FUEL CAP) · airframe 31,255 hrs

DURING FLIGHT, FUEL PRESSURE ON NR 2 ENGINE TO BE UNSTABLE AND LOW. ELECTED TO SHUTDOWN ENGINE AND FEATHER PROP. MADE UNEVENTFUL LANDING. MX INSPECTED THE AIRCRAFT AND DETERMINED RT HAND OUTBOARD FUEL CAP ADAPTER INSERT ASSEMBLY WAS DEFECTIVE AND BENT WHICH ALLOWED FUEL TO BE SIPHONED OUT AND CAUSED FUEL STARVATION TO THE NR 2 ENGINE. THE ADAPTER INSERT IS PART OF KIT 531-036. THIS KIT AND RETAINER RING ASSEMBLY IS MANDATORY TO BE INSTALLED PER AD 87-21-01. IT IS BELIEVED THAT ADVERSE FUELING NOZZLE STRESS TO THIS COMPONENT MAY HAVE LED TO ITS UNFAVORABLE BENT CONDITION WHICH RESULTED IN FUEL SIPHONING DURING FLIGHT. PICTURES WILL BE FORWARDED TO SDR MANAGERS IN ORDER TO FULLY CONVEY THE CONDITIONS RELATED TO THIS MATTER.

Part: TURBINE WHEEL — MISOVERHAULED (TURBOCHARGER)

TURBOCHARGER FAILURE OF TURBINE WHEEL ASSY DUE TO INCORRECT ASSEMBLY OF TURBOCHARGER FROM MFG. WASHER PN 407135-0000 WAS INSTALLED ON THE WRONG SIDE OF BEARING JOURNAL 407134-0000.

Part: SPOOL — BROKEN (PROP GOVERNOR)

ENGINE OVERSPEED DUE TO INTERNAL FAILURE OF THE PROPELLER GOVERNOR. SPOOL B-3166 SEPARATED FROM SPOOL EXTENSION A-3167, CAUSING GOVERNOR TO ACT AS IF IN AN UNDERSPEED CONDITION, SENDING BOOST OIL PRESSURE TO FORCE PROPELLER TO LOW PITCH. SEPARATION MAY HAVE BEEN CAUSED BY LOSS OF SPRING PIN B61320250.

Part: NUT — LOOSE (TURBOCHARGER)

THE MECHANIC WAS SPINNING THE TURBOCHARGER COMPRESSOR-TURBINE SHAFT BEFORE HE PUT THE INTAKE ELBOW ON THE TURBOCHARGER. WHEN HE DISCOVERED THAT THE LOCK NUT ON THE INTAKE END OF THE SHAFT COULD BE SPUN OFF BY HAND. NO EVIDENCE OF THE INSPECTORS LOCK SEAL, ETC. NUT TO THREAD FIT IS LOOSE. TURBOCHARGER TSO IS -0- HOURS. ENGINE OVERHAULED AT MFG.

Part: CONTACTOR — LOOSE (RT MAG LT ENG)

PILOT REPORTED INOPERATIVE RIGHT MDG ON LEFT ENGINE. UPON INSPECTION OF MAGNETO, THE CONTACT ASSEMBLY WAS FOUND TO BE THE CAUSE. THE TWO RIVETS THAT HOLD THE CAM FOLLOWER ONTO THE CONTACT ASSEMBLY WERE LOOSE. ITLOOKS LIKE THE SLOT HEADS HAVE WORN INTO THE CAM FOLLOWER MANUAL.

Part: SUPPORT BRACKET — CRACKED (NLG ACTUATOR)

CRACK IN RADIUS OF NOSE GEAR ACTUATOR ATTACH SUPPORT BRACKET. FOUND DURING INSPECTION.

Part: SUPPORT BRACKET — CRACKED (NLG ACTUATOR)

CRACK IN RADIUS OF NOSE GEAR ACTUATOR ATTACH SUPPORT BRACKET, FOUND DURING INSPECTION.

Part: SHAFT — STIFF (T/E FLAP)

FLAPS WOULD NOT RETRACT AFTER LANDING. FINDINGS: THE RIGHT FLAP FLEXIBLE SHAFT ASSEMBLY TURNS VERY STIFFLY AND CONTRIBUTED TO FAILURE OF THE FLAP ACTUATOR MOTOR. THE LEFT FLEXIBLE SHAFT ASSEMBLY TURNS FREELY.(K)

Part: REGULATOR — LEAKING (HEATER)

FUEL REGULATOR ON JANITROL HEATING SYSTEM (FORWARD) LEAKED AT CASE PARTING SURFACES. (X)

Part: HEATER — MALFUNCTIONED (HEATER)

FUEL WAS OBSERVED RUNNING OUT OF THE FUEL REGULATOR/SHUTOFF VALVE DRAIN CAVITY ON THE FRONT HEATER DURING A ROUTINE HEAT OR MAINTENANCE CHECK. FURTHER INVESTIGATION REVEALED THE VALVE WAS LEAKING FROM THE MATING SURFACE BETWEEN THE VALVE BODY AND THE REGULATOR PORTION OF THE VALVE. SUSPECT A TORN DIAPHRAGM IN THE REGULATOR. REPLACED VALVE WITH A NEW UNIT. HEATER FUNCTIONALLY CHECKED SATISFACTORY. THIS IS THE FIFTH MALFUNCTION OF THIS VALVE ON THE COMPANY'S ACFT IN RECENT MONTHS.

Part: REGULATOR — LEAKING (HEATER PRESSURE)

FUEL LEAK ON INLET SIDE OF REGULATOR BODY. SUBMITTER STATED THIS WAS ONE OF THREE REGULATORS INSTALLED IN A TWO-WEEK PERIOD THAT FAILED. MFG DATE 7-98. REMOVED 11-10-98.

Part: DISTRIBUTOR GEAR — TEETH MISSING (LT ENG RT MAG)

DURING RUN-UP BEFORE FLIGHT, FOUND BAD MAG CHECK ON LT ENGINE RT MAG. REMOVED MAG FOR INSPECTION AND FOUND WHITE PLASTIC DRIVE GEAR INSIDE MAGNETO WAS MISSING NUMEROUS DRIVE TEETH, THE REST OF MAGNETO APPEARS SERVICEABLE.