N911MK

EUROCOPTER DEUTSCHLAND GMBH MBB BK 117 C-2 No injuries Part 135 — MRIS, LLC

Operated by MRIS LLC (per NTSB report)

ATA 7261

Part: OIL SYSTEM — PLUGGED (NR 2 ENGINE) · airframe 6,284 hrs · 14,660 cycles

THE PROBLEM APPEARS TO BE A PLUGGED SCAVENGE LINE DUE TO INTERNAL ENGINE COKING. THE RESULT COULD BE EXCESSIVE INTERNAL OIL PRESSURES CAUSING EXTERNAL DISCHARGE OF THE OIL, IN THIS CASE OUT THROUGH A VENT LINE. ALONG WITH THAT THERE WOULD BE A BYPASS OF OIL INTERNALLY THROUGH THE LABYRINTH SEALS (3) AND WOULD ALLOW THE OIL TO ENTER AND EXIT THE GAS GENERATOR ALLOWING FOR AN IGNITION SOURCE AND IGNITION. AT THAT POINT YOU WOULD HAVE AN IGNITION SOURCE AT THE GAS GENERATOR, BURNING OIL RUNNING DOWN THE SIDE OF THE ENGINE ALONG WITH VENTING OIL AVAILABLE DRAINING ONTO THE DECK AND ADDING FUEL (OIL) TO THE FIRE.

ATA 5302

Part: STRUCTURE — CRACKED (TAIL BOOM) · airframe 2,766 hrs · 6,686 cycles

TWO CRACKS NOTED DURING PREFLIGHT INSPECTION ON THE LT HORIZONTAL STABILIZER LOWER SIDE. NO OTHER VISUAL INDICATION OF DAMAGE.

ATA 2150

Part: COMPRESSOR — SEIZED (A/C PACK) · airframe 54 hrs · 235 cycles

DURING FLIGHT, A SLIGHT 'SQUEAL' NOISE WAS HEARD FOLLOWED BY A BURNED RUBBER ODOR. THE AIR CONDITIONER WAS SWITCHED OFF, THE NOISE QUIT. ACFT MADE A PRECAUTIONARY LANDING AT A LOCAL AIRPORT. THE AIR CONDITIONER COMPRESSOR HAD LOCKED UP AND BURNED THE DRIVE BELT.

ATA 2697

Part: FEEDER CABLE — SHORTED (FIRE WARNING SYS) · airframe 9,042 hrs

CABLE SHORTED, CAUSING FALSE FIRE WARNING INDICATION.

ATA 7321

Part: FUEL CONTROL — FAILED (ENGINE)

FUEL CONTROL FAILED UPON INSTALLATION. REMOVED AND REPLACED. (X)

ATA 7250

Part: SPRING CARRIER — SPALLED (POWER TURBINE)

SPRING CARRIER FAILED IN POWER TURBINE. METAL PICK-OUT AT BEARING MATING SURFACE. REMOVED AND REPLACED SPRING CARRIER.

ATA 2312

Part: TRANSCEIVER — FAILED (COCKPIT)

UPON INITIAL TRANSCEIVER INSTALLATION, CIRCUIT BREAKER TRIPS WHEN TRANSMITTER BUTTON IS KEYED. REMOVED AND REPLACED.

ATA 6510

Part: DRIVE SHAFT — OUT OF LIMITS (T/R)

TAIL ROTOR DRIVE AFTER INSTALLATION, PART WAS DETERMINED TO BE DEFECTIVE FROM FACTORY. END PLATE OUT OF LIMITS PER BHT 222 OMM.

ATA 6240

Part: INDICATOR — FLUCTUATES (TRIPLE TACH)

TRANSMISSION TORQUE NEEDLE FLUCTUATES 20 - 30 PERCENT, FALLS TO ZERO, AND THEN RETURNS AND BEGINS TO FLUCTUATE AGAIN.

ATA 2840

Part: INDICATOR — READS LOW (COCKPIT MGT)

INDICATOR READS 10 PERCENT LOW, NR 2 ENGINE.

ATA 3340

Part: LIGHT — INOPERATIVE (STROBE)

INOPERATIVE STOBE LIGHT.

ATA 7931

Part: TRANSDUCER — DEFECTIVE (OIL PRESSURE)

AS TRANSDUCERS WARM UP, PRESSURE DROPS OFF. WILL STAY AROUND 50 PSI.