N972BH

Part: GEARBOX — MAKING METAL (MAIN ROTOR)

DURING A TOUR FLIGHT THAT DEPARTED AIRPORT, THE MGB CHIP LIGHT ILLUMINATD 3 MINUTES INTO THE FLIGHT. THE PILOT RETURNED TO DEPARTURE WITHOUT INCIDENT. THE MECHANIC INSPECTED THE CHIP PLUGS AND FOUND METAL ON LOWER PLUG. THE OIL WAS CHANGED AND THE CHIP PLUG LIGHT ILLUMINATED AGAIN. THE MAIN GEAR BOX AND OIL COOLER WAS CHANGED.

Part: CHIP DETECTOR — ACTIVATED (ENGINE)

PRECAUTIONARY LANDING, DEVIATION FROM INTENDED ROUTE OF FLIGHT, DUE TO ENGINE OIL CHIP LIGHT ANNUNCIATION. UNEVENTFUL LANDING AT DEPARTURE AIRPORT. NO INJURIES, NO DAMAGE TO AIRCRAFT OR PROPERTY. MAINTENANCE INVESTIGATED AND FOUND NO CHIPS ON THE CHIP DETECTOR. SOME CHIPS FOUND IN OIL AND IN VACINITY OF CHIP DETECTOR PLUGS. ENGINE WAS REMOVED FROM SERVICE FOR REPAIR TEARDOWN INSPECTION. DETERIORATION OF AN INTERNAL OIL WETTED ENGINE COMPARTMENT. CHIP LIGHT MAY HAVE BEEN TRIGGERED BY NON-FERROUS CHIPS CIRCULATING IN THE OIL SYSTEM FROM A DETERIORATING INTERNAL COMPONENT, TBD AT TEARDOWN. LOCATION: ITO HILO HI. (K)

Part: GEAR SET — CORRODED (MAIN ROTOR)

GEAR SET HAS EXCESSIVE FROSTING AND PITTING. REQUESTING WARRANTY CONSIDERATION. (K)

Part: CONNECTOR — LOOSE (OIL TEMP PROBE)

DURING A TOUR FLIGHT WITH 4 PASSENGERS ON BOARD, PILOT NOTICED A HIGH ENGINE OIL TEMPERATURE READING. HE ELECTED TO PERFORM A PRECAUTIONARY LANDING. UPON INSPECTION, THE MECHANIC FOUND THE SPADE CONNECTION LOOSE AND IT HAD MOISTURE ON IT. CONNECTION WAS TIGHTENED ADN MOISTURE REMOVED.

Part: ROD — WORN (PITCH CONTROL) · airframe 9,025 hrs

PART IS WORN BEYOND LIMITS.PLEASE REPLACE BEARINGS UNDER WARRANTY.

Part: ROD — WORN (PITCH CONTROL) · airframe 10,021 hrs

PART IS WORN BEYOND LIMITS.PLEASE REPLACE BEARINGS UNDER WARRANTY.

Part: BEARING — WORN (PITCH ROD)

PITCH CONTROL WORN BEYOND LIMITS.

Part: PUMP — MALFUNCTIONED (ENGINE)

JANUARY 2, 1999, AT APX 16:30 HOURS, WHILE ON A ROUTINE SIGHTSEEING FLIGHT, PILOT EXPERIENCED A FUEL FILTER CAUTION LIGHT. COLLECTIVE MOVEMENTS CREATED FLUCTUATIONS IN FUEL PRESSURE AND NO ROTOR RPM DROOP. PILOT LANDED AT BEST SITE AVAILABLE AT MAUNA KEA RESORT HELIPAD WITHIN TEN MINUTES OF LIGHT ILLUMINATION. INSPECTION OF ACFT TANK SUMP - FUEL WAS FOUND CLEAN. FUEL AT THE AIRFRAME FUEL FILTER WAS DARK IN COLORING. PROBLEM CONFIRMED TO BE FROM ELECTRIC BOOST PUMP. REPLACED FUEL BOOST PUMP AND FUEL CONTROL REGULATOR. SUBMITTER STATED POSSIBLE INTERNAL SEAL LEAKAGE AND BRUSH MATERIAL FLUSHED INTO SYSTEM AND RECOMMENDED THAT AIRBORNE EVALUATE PUMP SEALS.

Part: BEARING — WORN (TAIL ROTOR)

BEARINGS WORN BEYOND LIMITS AND TORN. (X)

Part: BEARING — WORN (T/R DRIVE)

T/R DRIVE BEARING WORN BEYOND LIMITS; TORN.

Part: BEARING — WORN (T/R DRIVE)

T/R ROTOR DRIVE BEARING IS WORN BEYOND LIMITS. (X)

Part: BEARINGS — CRACKED (T/R)

BEARING CAUSED T/R FREQUENCY VIBRATIONS. WORN BEYOND LIMITS.

Part: LAMIFICATION — CRACKED (T/R)

REAR ROTOR LAMIFICATION IS CRACKED.

Part: BEARING — CRACKED (T/R)

BEARING IS CRACKED BEYOND LIMITS.

Part: HINGE LAMINATE — CRACKED (T/R)

REAR ROTOR LAMIFICATION IS CRACKED.

Part: SEAL MAGNETIC — DEFECTIVE (T/R GR BOX)

PART IS DEFECTIVE. LEAKS BADLY.

Part: ENCODER — DEFECTIVE (COCKPIT)

ENCODER HAS INACCURATE ALTITUDE ENCODING.

Part: SEAL — LEAKS (T/R BOX)

SEAL WORN BEYOND LIMITS. LEAKS BAD.

Part: SERVO — LEAKING (T/R)

SERVO LEAKING BAD IN OUTPUT AREA.

Part: BALL JOINT — WORN (T/R)

BALL JOINT HAS EXCESSIVE AXIAL PLAY IN BEARING.

Part: PROBE — ERRATIC (OIL TEMP)

PROBE UNIT ERRATIC AND CAUSING OIL TEMPERATURE FLUCTUATIONS.

Part: COUPLING — BORE WORN (GIMBAL)

COUPLING BORES WORN.

Part: GIMBAL HOUSING — DAMAGED (LT EAR MOUNT)

LEFT EAR MOUNT COMPRESSOR PIVOT POINT GROUND DOWN.

Part: BLADE — CRACKED (T/R NR 2 TE TAB)

CRACKS AT BLADE NR 2 T.E. TAB, INBOARD AREA. CRACK BEYOND LIMITS.

Part: GIMBAL RING — BEARING UNBONDED (ENG/XMSN)

BUSH BEARING WAS SPINNING OR UNBONDING AND TURNING.