N4573B

Part: NOZZLE — CRACKED (NR 1)

ENGINE REMOVED DUE TO 3,500 HOUR OVERHAUL. UPON INSPECTION OF TURBINE PARTS NOTED THE FOLLOWING: CRACKED VANES ON NR 1 NOZZLE. INSTALLED NEW PART.

Part: TRANSCEIVER — INOPERATIVE (COCKPIT)

INOPERATIVE. WILL NOT COME ON. PERFORMED PRELIMINARY INSPECTION. FOUND UNIT TO BE DRAWING CURRENT, BUT ALL POWER SUPPLY VOLTAGES ARE LOW.

Part: TRANSDUCER — READS LOW (FUEL SYSTEM)

TRANSDUCER READS EXCESSIVLEY LOW.

Part: TRANSDUCER — FAILED (FUEL SYSTEM)

TRANSDUCER - OUTPUT DOES NOT CHANGE WITH PRESSURE APPLIED.

Part: INDICATOR — FLUCTUATED (TRIPLE TACH)

OIL INDICATION FLUCTUATES, NR 1 NEEDLE STICKS AT ZERO.

Part: DRIVE SHAFT — CRACKED (TAIL ROTOR)

CRACKS AND FLAKING ON INBOARD JOURNAL FLAME SPRAY COATING.

Part: FUEL CONTROL — OUT OF ADJUST (FUEL SYSTEM)

ON FIRST START AFTER INSTALLATION IN THE AIRCRAFT, TOT ROSE RAPIDLY. FOUND START/ACCEL AND START/DERICH ADJUSTMENTS TURNED TO MINIMUM, NO MORE ADJUSTMENT AVAILABLE. RECEIVED UNIT IN SHOP WITH START DERICHMENT AND START ACCELERATION ADJUSTMENTS BOTH ADJUSTED TO THE CCW STOP. TESTED UNITS START DERICH OPERATION IN SHOP, TESTED SATISFACTORY. TESTED START DERICH AND START ACCEL. IN FLOW ROOM, BOTH TESTED SATISFACTORY. COMPLETED TESTING OF UNIT PER TEST SPEC. NR 12529-01, UNIT TESTED OK.

Part: SERVOMOTOR — FAILED (FUEL CONTROL)

SERVO MOTOR WILL NOT ACTUATE, FILTER SHORTED TO GROUND.

Part: TRANSDUCER — FAILED (FUEL SYSTEM)

NO OUTPUT FROM TRANSDUCER.

Part: BEVEL GEAR SET — SPALLED (M/R GEARBOX)

SPALLING OF M/R GEARBOX GEAR TEETH. SCRAPPED PARTS AND REPLACED WITH NEW PARTS.

Part: INDICATOR — OUT OF TOLERANCE (ENGINE TOT)

FOUND ENGINE TOT UNIT TO READ OUT OF TOLERANCE THROUGHOUT SCALE.

Part: TRANSMITTER — INOPERATIVE (FUEL PRESSURE)

FUEL PRESSURE TRANSMITTER INOPERABLE.

Part: TRANSMITTER — FAILED (MAST MOMENT)

MAST MOMENT INDICATOR NO INDICATION IN FLIGHT.

Part: INDICATOR — FAILED (MAST MOMENT)

MAST MOMENT INDICATOR HAS NO INDICATION IN FLIGHT.

Part: BEVEL GEAR — SPALLED (TRANSMISSION)

FOUND SPALLING ON BEVEL GEAR TEETH. REPLACED WITH SERVICEABLE PART.

Part: SUN GEAR — SPALLED (TRANSMISSION)

FOUND SPALLING ON SUN GEAR TEETH. REPLACED WITH SERVICEABLE PART.

Part: SPLINE ADAPTER — WORN (COMPRESSOR)

ENGINE REMOVED DUE TO CRACKED COMPRESSOR SCROLL AND VIBRATION. UPON INSPECTION OF COMPRESSOR PARTS NOTED: WORN BEYOND SERVICEABLE LIMITS ON SPLINE ADAPTER RETAINING RING GROOVE. INSTALLED A NEW SPLINE ADAPTER.

Part: TRANSDUCER — FAILED (FUEL PRESS)

INDICATES LOW OUT OF TOLERANCE.

Part: TRANSDUCER — DEFECTIVE (FUEL PRESS)

FUEL PRESSURE INDICATES LOW OUT OF TOLERANCE.

Part: GOVERNOR — MALFUNCTIONED (NR 2 ENGINE)

DURING FLIGHT, NR 2 ENGINE BEGAN OSCILLATING. PILOT RETURNED TO BASE AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED ENGINE N2 GOVERNOR DUE TO STIFF CONTROL SHAFT. REF: ALLISON C-20 IPC, CHAPTER 73-20-00, FIG 2, ITEM 81.

Part: GYRO — DEFECTIVE (COCKPIT DG)

DIR GYRO INTERMEDIATE GEAR OUT OF BALANCE. EAST HEADING PRECESSES EXCESSIVELY.

Part: COUPLING — WORN (TURB N1)

ENGINE REMOVED DUE TO METAL. UPON INSPECTION OF TURBINE PARTS NOTED: WEAR BEYOND SERVICEABLE LIMITS ON N1 COUPLING SPLINES (FAILED NO GO GAUGE) INSTALLED A NEW N1 COUPLING.

Part: TRANSCEIVER — INOPERATIVE (COCKPIT NAV)

TRANSCEIVER LOCALIZER INOPERATIVE.

Part: TRANSDUCER — FAILED (FUEL SYS)

TRANSDUCER PEGS HIGH AND FLUCTUATES.

Part: TUBE ASSY. — OUT OF SPEC (GEARBOX)

ENGINE REMOVED DUE TO METAL IN OIL. UPON INSPECTION OF GEARBOX PARTS NOTED THE FOLLOWING:TUBE FAILED DIMENSIONAL CHECK PER CEB 1307. INSTALLED A NEW PART.

Part: REAR DIFFUSER — MIS MFG (BEARING BORE)

RECEIVING INSPECTION REVEALED: BEARING BORE UNDERSIZED MEASURED 2.165 (SPECS 2.1654 - 2.1659) ON REAR DIFFUSER.