N912NH

ATA 8012

Part: START VALVE — LEAKING (NR 2 ENGINE) · airframe 7,285 hrs · 20,772 cycles

AIRCRAFT DEPARTED, AIR CREW REPORTED SMELLING FUEL IN THE REAR COMPARTMENT AND VISUALLY SAW A CLEAR FLUID DRIPPING DOWN THE REAR CLAM SHELL WINDOW. THE FLIGHT WAS ABORTED AND LANDED BACK AT THE TAKEOFF POINT WITHOUT INCIDENT. MECHANIC SUSPECTED THAT THE START VALVE ON THE ENGINE WAS STUCK. RAN THE TEST PROCEDURE IAW EMM 73-00-00-760-801-A01. FUEL IS ALLOWED TO LEAK AT 33 DROPS PER MINUTE AFTER ENGINE START. IT WAS A STEADY STREAM OF FUEL FOLLOWING ENGINE START. THE PROCEDURE STATES CHANGE THE START VALVE. REPLACED THE START VALVE, AND PERFORMED OPERATIONAL CHECKS WITH NO DEFECTS NOTED. THE AIRCRAFT WAS RETURNED TO SERVICE.

ATA 6320

Part: PINION GEAR — WORN (MAIN GEARBOX) · airframe 7,236 hrs · 20,636 cycles

PRIOR TO ENGINE START, AS THE PILOT SWITCHED ON BATTERY POWER, THE MAIN TRANSMISSION CHIP DETECTION ILLUMINATED. THE PILOT IMMEDIATELY ABORTED THE START SEQUENCE AND CALLED THE MECHANIC TO COME INSPECT THE AIRCRAFT. THE MECHANIC/S COMPLETED EO 23-6300-EO-669 PART 5,AND SCHEDULED PART 6. UPON EXECUTION OF PART 6 OF 23-6300-EO-669, THE MECHANICS FOUND THE LT PINION GEAR WORN BEYOND LIMITS. ACCORDING TO TECHNICAL DATA, THIS IS CAUSE FOR A MAIN GEARBOX REMOVAL AND REPLACEMENT. THIS AIRCRAFT REMAINS OUT OF SERVICE AT THE TIME OF THIS SUBMISSION AWAITING PARTS AND TOOLING TO COMPLETE THIS MAINTENANCE EVENT.

ATA 6210

Part: BLADE — CRACKED (MAIN ROTOR) · airframe 6,973 hrs · 19,897 cycles

DURING AN AIRWORTHINESS CHECK, PRE-FLIGHT INSPECTION, A 2" CRACK WAS FOUND ON THE GREEN M/R BLADE CUFF T/E; 10" FROM THE CUFF EDGE.

ATA 2120

Part: UNKNOWN — ODOR (CABIN) · airframe 6,416 hrs · 18,370 cycles

DURING TAKEOFF, THE CREW MEMBER IN THE AFT COMPARTMENT STATED THAT SHE HEARD A RATTLING NOISE AFTER PASSING ETL. THE ACFT LANDED BACK AT THE HOME BASE WHEN SHE MADE ANOTHER WALK AROUND INSPECTION. AFTER FINDING NOTHING TO ACCOUNT FOR THE NOISE, WE DEPARTED FOR THE MISSION REQUEST. SOON AFTER DEPARTING THE SAME AFT CREW MEMBER NOTED AN ELEC INSULATION BURNING SMELL IN THE SAME COMPARTMENT. THE ACFT RETURNED BACK TO THE BASE & ABORTED THE FLIGHT. BEING IN THE FRONT CABIN AREA, THE PILOT NEVER HEARD THE RATTLE OR SMELLED ANYTHING UNUSUAL. RETURNED TO BASE & CALLED THE ON DUTY MECHANIC. COMPLETED A THOROUGH INSPECTION OF THE INTERIOR & EXTERIOR OF THE ACFT. THERE WERE NO ABNORMAL SMELLS, ANOMALIES OR DEFECTS NOTED. THE MECHANIC & PILOT PROCEEDED TO PERFORM GND RUNS TO TRY TO DUPLICATE THE VIBRATION & SMELLS, NO DEFECTS WERE NOTED. LASTLY, THE MECHANIC, PILOT & MEDICAL PERSON WHO REPORTED THE PROBLEM TOOK A TEST FLIGHT OF THE HELICOPTER & PROCEEDED TO TAKE THE SAME PATH & AIRSPEED OF THE ORIGINAL FLIGHT. NO DEFECTS, SMELLS, ANOMALIES OR ABNORMALITIES WERE FOUND IN FLIGHT. THE PILOT & MEDICAL CREW WERE SATISFIED THAT WE HAD EXHAUSTED ALL POSSIBILITIES OF REPEATING THE OCCURRENCE. THE ACFT WAS PLACED BACK IN SERVICE AT THAT TIME.

ATA 5312

Part: BULKHEAD — CRACKED (FUSELAGE) · airframe 6,334 hrs · 18,144 cycles

A MECHANIC DISCOVERED CRACKS IN THE BULKHEAD AREA OF THE REAR STRUCTURE CONE ASSEMBLY. AN APPROVED REPAIR HAS BEEN REQUESTED OF THE MANUFACTURER. THIS ACFT REMAINS OUT OF SERVICE AT THE TIME OF THIS SUBMISSION.

ATA 7320

Part: HMU — LEAKING (NR 2 ENGINE) · airframe 5,929 hrs · 16,844 cycles

ON POST FLIGHT WALK AROUND, FUEL WAS DISCOVERED LEAKING FROM A DRAIN COMING FROM THE NR 2 ENG DECK. TROUBLE SHOT THE LEAK, THE FUEL ADJUSTED PUMP & METERING VLV, HMU, WAS LEAKING AT APPROXIMATELY 10 DROPS PER MINUTE DURING A GND RUN. UPON SHUTDOWN FROM THE GND RUN, THE HMU WAS SPRAYING OUT THE SIDE OF THE HMU HOUSING THROUGH 3 OR 4 PIN HOLES ON THE SIDE OF THE HOUSING. THE HMU HAS BEEN REPLACED & THE ACFT HAS RETURNED TO SERVICE.