ArrielSafran (Turbomeca) Arriel
safran engineEffective Sep 29, 2026Timetable 1995–2026
What mechanics have reported to the FAA on the Safran (Turbomeca) Arriel’s engine, ignition, fuel and propeller systems, and the airworthiness directives that name it. Arriel 1 and Arriel 2 turboshafts (AS350/H125, EC130, AS355N, Sikorsky S-76).
Reports that name this engine, in powerplant and electrical systems only.
- Aircraft with it
- 1,527 registered, FAA Sep 29, 2026
- Reports on file
- 1,668 since 1995
- 2016–2025
- 163, about 10.7 a year per 1,000 aircraft
- ADs in force
- 53 naming it
- Filed by GA
- 37% of reports
What gets written up
1,668 reports · 1995–2026
72Engine (Turbine/Turboprop)18711%42
Parts most often named Engine (126) · Bearing (9) · Module (7) · Magnetic Seal (6)
A CUSTOMER ENGINE WAS RECEIVED AS AN EXCHANGE TO BE INSTALLED IN A AS35B3 HELICOPTER. A PRE-INSTALLATION INSPECTION FOUND SIGNIFICANT METAL CONTAMINATION IN THE OIL SYSTEM, INCLUDING THE FILTER AND MAG PLUGS. THE ENGINE WAS RECEIVED WITH AN 8130-3 INDICATING THAT A 800HR INSPECTION HAD BEEN COMPLETED (THIS INCLUDES A MAG PLUG INSPECTION.) SEVERAL OTHER DISCREPANCIES WITH THE DOCUMENTATION FOR THIS ENGINE WERE FOUND AND A SUP FORM 8120-11 IS BEING SUBMITTED.
DURING THE INITIAL START OF THE #2 ENGINE, IT WAS STARTING SLOW AND THEN THE TEMP TOOK OFF. I ABORTED THE START BEFORE ANY EXCEEDANCE. AFTER [tail no. removed] REACHED 0 AND THE REQUIRED WAIT TIME FOR THE STARTER I ATTEMPTED A 2ND START. THE #2 ENGINE WASN'T STARTING IN THE REQUIRED TIME, I WAS GETTING NO TOT RISE AND AT 15 SECONDS I ABORTED THE START AND CONTACTED MX. PREFORMED MULTIPLE STARTS WITH MX AND COULD NOT DUPLICATE THE ISSUE.
MULTIPLE ENGINE CHIP CAUTIONS OVER A HANDFUL OF FLIGHTS SINCE MID-APRIL. MOST RECENT EVENT (THIS INCIDENT) OCCURRED LESS THAN ONE DAY AND 0+45 FLIGHT HOURS AFTER PREVIOUS INCIDENT. MULTIPLE CHIPS (IN EXCESS OF 20) FOUND ON CHIP DETECTOR (M01) AND SEVERAL CHIPS/SLIVERS (IN EXCESS OF 5) FOUND ON, AT LEAST, ONE MAG PLUG (M05). AIRCRAFT GROUNDED AND OIL SAMPLES/CHIP CARDS PULLED AND SENT FOR ANALYSIS. REPLACED ENGINE AND HMU
72Turbine Engine Oil System1187.1%15
Parts most often named Magnetic Seal (15) · Chip Detector (14) · Pump (7) · Vent Line (7)
MAJOR OIL LEAK. DISCOVERED BY NURSE STOWING EQUIPMENT IN REAR COMPARTMENT. HE ADVISED ME OF OIL ALL OVER THE SIDE OF AIRCRAFT. I SHUT DOWN THE AIRCRAFT AND EXITED TO INSPECT. REMOVED AND RE-INSTALLED OIL VENT LINE FROM TANK, GROUND RUN, LEAK CHECK WAS GOOD, REINSTALLED MAIN ROTOR BLADES, RII CHECKLIST AND OPERATIONAL CHECK FLIGHT COMPLETED.
PILOT REPORTED ON POST FLIGHT INSPECTION, DISCOVERED OIL ON OUTSIDE OF ENGINE COWLING, DRAINING FROM ENGINE DECK DRAIN LINES AND SMOKE COMING OFF OUTSIDE OF EXHAUST DUCT AND OIL ON OUTSIDE OF THE ENGINE. MECHANIC FOUND B-NUT VENT LINE LOOSE AND DISCONNECTED. CLEANED AREA AND REINSTALLED OIL VENT LINE PER ENGINE MANUAL. MOC OK. NO DEFECTS. BIS
BLOCKED OIL RETURN LINE DUE TO OIL COKING. LOW OIL PRESSURE CAUTION ILLUMINATED AND PILOT MADE EMERGENCY LANDING SAFELY. THIS CONDITION CAUSES OIL TO FLOW INTO THE EXHAUST AREA AND BURNS THE OIL CAUSING SMOKE. THIS SMOKE WAS SMELLED IN CABIN BY PILOT UPON LANDING.
24Starter-Generator1066.3%8
Parts most often named Starter Gen (54) · Brushes (15) · Shaft (7) · Armature (5)
FOLLOWING PILOT REPORT OF LOSS OF ELECTRICAL POWER, FOUND AIRCRAFT BATTERY WITH 21.9 VOLTS. RG355 BATTERY SUBSEQUENTLY TESTED FOLLOWING CHARGE AT 129% CAPACITY. BATTERY TOTAL TIME 4 MONTHS & 400 HOURS. REPLACED STARTER GENERATOR FOR BENCH TESTING. NO DISCREPANCIES NOTED ON ELECTRICAL SYSTEM. STARTER GENERATOR HAD NO SIGNS OF HEAT OR DUST OR SMELL AND ROTATED SMOOTHLY. TEST RESULTS PENDING.
CREW DETECTED A STRONG ELECTRICAL BURNING SMELL DURING FLIGHT BACK TO BASE. NO SMOKE MADE A PRECAUTIONARY LANDING AT KCIC.
ON THE FIRST ENGINE START OF THE DAY THE STARTER WOULD NOT ENGAGE THE ENGINE. FOUND THE STARTER GENERATOR SHAFT HAD SHEARED.
74Spark Plug/Igniter1016.1%0
Parts most often named Igniter (83) · Igniter Plug (5) · Ignitor (4) · Electrode (2)
(CAN) DURING SCHEDULED INSPECTION, ENGINE FAILED TO START ON LT IGNITION SYS IAW TEST CRITERIA. IGNITER REMOVED AND FOUND ERODED, AND A SMALL ROUND PART FROM INSIDE THE IGNITER HAD MIGRATED TO THE TIP OF THE IGNITER AND BECOME STUCK AT THE END OF THE BODY. APPEARS TO BE A VERY HARD PIECE OF METAL THAT HAD IT BECOME DISLODGED FROM THE TIP OF THE IGNITER, IT POSSIBLY WOULD HAVE CAUSED SIGNIFICANT FOREIGN OBJECT DAMAGE TO THE TURBINE BLADES.
(CAN) UPON VISUAL INSPECTION OF IGNITER, FOUND SMALL ROUND PART INSIDE TIP OF IGNITER LOOSE, ABOUT TO FALL OFF INTO COMBUSTION CHAMBER. HAD THE TIP COME OFF IT COULD POTENTIALLY HAVE CAUSED SIGNIFICANT FOD DAMAGE TO TURBINE BLADES.
INNER CERAMIC INSULATOR FOUND TO BE LOOSE, FOUND DURING VISUAL INSP BY SHAKING IGNITOR VIGOROUSLY. IGNITOR STILL WORKS BUT CONCERN OF INNER CERAMIC DISLODGING WAS REASON FOR THE REPLACEMENT OF THE IGNITORS.
73Fuel Control/Turbine Engines955.7%6
Parts most often named Fuel Control (41) · Fcu (33) · Hmu (4) · Cable (2)
AFTER DEPARTURE PILOT EXPERIENCED SLIGHT NG FLUCTUATION AND SLIGHT YAW MOTION. PILOT RETURNED FOR LANDING. DURING TROUBLE SHOOTING MAINTENANCE OF THE ENGINE FUEL CONTROL UNIT, MAINTENANCE FOUND INSIDE THE ACCELERATION CONTROLLER CHAMBER THAT THE LOWER CIRCLIP WAS MISSING FROM FROM A LEVER PIN AND A SPRING FROM THE PIN WAS DISENGAGED FROM THE PIN. FUEL CONTROL WAS REMOVED FROM ENGINE TO BE SENT TO REPAIR SHOP.
NR 2 ENGINE UNDERSPEED IN-FLIGHT. SUSPECT INTERNAL FAILURE OF FUEL CONTROL. REM'D FUEL CONTROL. INSTALLED [S/N removed] FUEL CONTROL. PERFORMED GROUND RUN/LK CHK. PERFORMED OPERATIONAL CHK FLIGHT. CHK'D GOOD. NO ANOMALIES. ACFT RETURNED TO [S/N removed].
FUEL LEAK FROM THE L/H ENGINE DECK OVERBOARD DRAIN BY PILOT DURING POST FLIGHT CHECK. TROUBLESHOOTING REVEALED AN OUT OF LIMITS FUEL LEAK OF THE F.C.U (FUEL CONTROL UNIT) NFT SEAL.
73Fuel Controlling System824.9%7
Parts most often named Fuel Control (15) · Manifold (14) · Valve (6) · Hmu (6)
(CAN) DURING A ROUTINE INSPECTION OF THE PRE BLOCKAGE SWITCH IN ACCORDANCE WITH THE MANUFACTURERS INSTRUCTIONS IT WAS FOUND THAT THE SWITCH FAILED TO CLOSE AT THE CORRECT PRESSURE. (TC# 20190726032)
AFTER PATIENT LOADING, DURING FINAL WALK AROUND, MED CREW NOTICED FUEL LEAKING FROM #2 ENGINE. MECHANIC, UPON FURTHER INSPECTION, FOUND FUEL SHUTOFF VALVE LEAKING AT FILTER BOWL. REPLACED PACKING. LEAK CHK GOOD. NO OTHER DEFECTS NOTED.
(CAN) YELLOW GOV LIGHT ILLUMINATED IN CRUISE FLIGHT WITH THE SMELL OF "ELECTRICAL BURNING" CREW ALSO REPORT THE AFT BAGGAGE COMPARTMENT, EECU LOCATION, SMELT OF BURNED ELECTRONICS. TROUBLESHOOTING CONFIRMED FAULTY EECU. [S/N removed] EECU INSTALLED. ACFT HAS RETUNED TO [S/N removed]. THIS IS OUR SECOND AMBER GOV LIGHT CAUSED BY A FAULTY EECU WITHIN THE LAST 6 MONTHS.
72Turbine Section744.4%6
Parts most often named Turbine (11) · Bearing (9) · Turbine Blades (7) · Blade (7)
DURING COAST DOWN AFTER POST INSPECTION GROUND RUNS MECHANICS HEARD A NOISE COMING FROM THE ENGINE MODULE 4 AND MODULE 5 AREA. TURBOMECA WAS CONTACTED AND HAS REQUESTED THAT THE MODULES BE SENT IN FOR ANALYSIS.
DURING CRUISE FLIGHT THE CENTRAL WARNING PANEL, ENGINE CHIP, SEGMENT ILLUMINATED. PILOT PROCEEDED TO PERFORM A NORMAL POWERED PRECAUTIONARY LANDING. MAINTENANCE PERSONNEL DISPATCHED TO THE ACFT DETERMINED METAL FOUND ON THE AIRCRAFT'S ENGINE ELECTRIC CHIP DETECTOR EXCEEDED MFG LIMITATIONS FOR AIRWORTHINESS. AIRCRAFT TO BE TRANSPORTED TO MAINTENANCE BASE FOR ENGINE REPLACEMENT AND ENGINE RETURN TO MFG FOR EVALUATION AND REPAIR.
DURING TAXI BOTH PILOTS HEARD AN ABNORMAL WHINNING NOISE COMING FROM THE NR 1 ENGINE, IMMEDIATELY FOLLOWED BY A NR 1 ENGINE CHIP LIGHT. THEY SHUT THE ENGINES DOWN. UPON FURTHER INSPECTION THE FREE TURBINE WAS FOUND TO HAVE DESTROYED BLADES. IT WAS ALSO NOTED THAT THERE WAS NO FOD INGESTION. THE ENGINE IS FWD TO THE MFG FOR FURTHER EVALUATION.
73Engine Fuel Distribution643.8%4
Parts most often named Line (17) · Manifold (13) · Valve (6) · Pipe (5)
DURING ENGINE START WITH A PATIENT ON BOARD THE NR 1 ENGINE WOULD NOT START. AFTER 2 FAILED ATTEMPTS MX WAS CONTACTED. FOUND A FAULTY ADJUSTED VALVE ASSEMBLY.
IN FLIGHT FUEL LEAK ON ENGINE #1 DUE TO 2 HARD FUEL LINES RUBBING TOGETHER DURING FLIGHT. REMOVED AND REPLACED DAMAGED PIPE IAW SAFRAN EMM 06 73-19-00-900. LEAK TESTS AND RUNUP SATIFACTORY.
(CAN) HELICOPTER FAILED TO START, FUEL SMELL DETECTED. INVESTIGATION LED TO FUEL LEAK AT START ELECTRO-VALVE PIPE. FLARE FOUND SEPARATED FROM TUBE, TUBE REPLACED WITH [S/N removed], LEAK CHECKED, GROUND RUN, NO FURTHER DEFECTS FOUND. TUBE CONTAINS FUEL ONLY AT START UP PHASE, THEN IS PURGED WITH COMPRESSOR AIR DURING OPERATION. (TC# 20190529011)
75Compressor Bleed Valve613.7%1
Parts most often named Bleed Valve (52) · Switch (2) · Bellows (1) · Sleeve (1)
DURING CRUISE FLIGHT EXPERIENCED A YAW KICK, BURNING RUBBER SMELL AND FLI FAILURE. NO LOSS OF FLIGHT CONTROLS OR OTHER INDICATIONS. PRECAUTIONARY LANDED AT AIRPORT MINUTES LATER. SUBSEQUENT FLIGHT CHECKS SHOWED LOSS OF ENGINE POWER AT A HOVER. INSUFFICIENT POWER AVAILABLE TO EVEN EXECUTE A NORMAL TAKEOFF. BLEED AIR VALVE WASN'T CLOSING UNTIL 98% NG AND BURNING SMELL STILL NOTICEABLE.
IN CRUISE, AT APPROX 78 PERCENT TORQUE, 110 KIAS, AND 2000 FT MSL, EXPERIENCED A VERY LOUD NOISE & HARD JERK IN YAW AXIS OF AT LEAST 45 DEGREES TO RT. REPLACED ENGINE BLEED VALVE. TEST FLIGHT ACCOMPLISHED. NO DEFECTS REPORTED, ACFT RETURNED TO BASE.
DURING TROUBLESHOOTING TO DETERMINE ENGINE LOW POWER CAUSE, FLAP OF THE BLEED VALVE FOUND LOOSE. FLAP CAN BE ROTATED EASILY BY HAND. BLEED VALVE REPLACED. FLY TEST C/O. NORMAL OPERATION OF THE NEW BLEED VALVE, BUT THIS WAS NOT THE CAUSE OF LOW POWER ISSUE.
72Turbine Engine Compressor Section563.4%0
Parts most often named Compressor (18) · Cover (5) · Module (4) · Compressor Wheel (4)
INSTALLED MODULE 3, FRESH OUT OF OVERHAUL. DURING OPS CHECKS A LOUD "HOWLING" WAS OBSERVED. ENGINE WAS SHUTDOWN, REMOVED AND SENT TO MFG FOR FURTHER INVESTIGATION.
CLIMB OUT FROM A SIMULATED ENGINE FAIL USING THE TRAINING SWITCH IN A SA365. SMOKE AND FUMES IN THE COCKPIT PREDOMINATELY ON COPILOT SIDE. NOTICED THE HEAT LEVER WAS SLIGHTLY FORWARD SHUTOFF, SMOKE AND FUMES REDUCED AND WENT AWAY. RETURNED TO FIELD AND LANDED. FOUND OIL LEAKING FROM SPLIT LINE OF COMPRESSOR MODULES 1 AND 2, ON NR 2 ENG CAUSED OIL INGESTION INTO BLEED AIR HEAT SYS, AFTER INSPECTING ENGINE IT IS DETERMINED THAT A MODULE 2-3 REPLACEMENT IS REQUIRED.
DURING THE 600 HR/24 MONTHS INSPECTION ON ENGINE AND AIRFRAME, FOUND MISSING RIVETS ON COMPRESSOR WASH NOZZLE PLUG. REMOVED DEFECTIVE PARTS AND FOUND METAL FROM RIVET SHAVINGS IN COMPRESSOR WASH NOZZLE. SUSPECT METAL MAY HAVE PASSED THRU COMPRESSOR WASH NOZZLE HOLE (0.054) TO COMPRESSOR AXIAL WHEEL OF ENGINE. SMALL EROSION FOUND ON COMPRESSOR WHEEL. THE PLUG WAS REPLACED AND THE EROSION FOUND WAS WITHIN LIMITS.
Open a row to read what mechanics wrote. Tail and serial numbers are removed.
More reports usually means more engines of that model in service.
Airframes that carry it
Airworthiness directives
ADs that name the Arriel, from Federal Register final rules. Applicability depends on the exact model, serial number and installed parts; confirm against the FAA’s Dynamic Regulatory System.
AD2026-15-03Effective Sep 3, 2026Safran Helicopter Engines, S.A. (Type Certificate Previously Held by Turbomeca, S.A.) EnginesRepetitive
New airworthiness limitations have been established for the Arriel 2E engine. Operators must revise their maintenance and inspection programs to incorporate the airworthiness limitations section from the approved aircraft maintenance program.
Engine models named Arriel 2E
Read the AD in the Federal RegisterAD2023-22-03Effective Dec 26, 2023Safran Helicopter Engines, S.A. (Type Certificate Previously Held by Turbomeca, S.A.) EnginesRepetitive
Safran has introduced new and more restrictive airworthiness limitations and maintenance tasks for Arriel 2D and 2E engines. This AD requires updating engine maintenance manuals and approved maintenance programs to incorporate the revised actions, thresholds, intervals, and life limits.
Engine models named Arriel 2D, Arriel 2E
Read the AD in the Federal RegisterAD2023-13-14Effective Jul 25, 2023Safran Helicopter Engines, S.A. (Type Certificate Previously Held by Turbomeca, S.A.) EnginesOne-time
False engine fire warnings have been reported on certain Safran helicopter engines due to affected fire detectors. This AD requires replacement of affected fire detectors and prohibits installation of those detectors.
Engine models named Arriel 1C, Arriel 1C1, Arriel 1C2, Arriel 1K1
Read the AD in the Federal RegisterAD2023-01-12Effective Feb 6, 2023Safran Helicopter Engines, S.A. (Type Certificate Previously Held by Turbomeca, S.A.) Turboshaft EnginesOne-time
False engine fire warnings have been reported on Arriel turboshaft engines due to affected fire detectors. This AD requires replacing the affected fire detectors and prohibits installation of the affected detectors.
Engine models named Arriel 1C, Arriel 1C1, Arriel 1C2
Read the AD in the Federal RegisterAD2021-13-08Effective Aug 19, 2021Safran Helicopter Engines, S.A. (Type Certificate Previously Held by Turbomeca, S.A.) Turboshaft EnginesOne-time
Blistering of varnish on the FADEC B digital engine control unit (DECU) circuit board causes error messages and unsafe engine control operation. This AD requires replacement of certain FADEC B DECUs.
Engine models named Arriel 2C, Arriel 2S1
Read the AD in the Federal RegisterAD2021-13-03Effective Aug 13, 2021Safran Helicopter Engines, S.A. (Type Certificate Previously Held by Turbomeca, S.A.) Turboshaft EnginesRepetitive
Certain Safran Helicopter Engines Arriel turboshaft engines are equipped with non-conforming fuel filter pre-blockage pressure switches that may not function properly. This AD requires repetitive visual inspections of the fuel filter by-pass indicator pop-up, a one-time operational test of the pressure switch, and replacement of the switch if necessary.
Engine models named Arriel 2B, Arriel 2B1, Arriel 2C, Arriel 2C1, Arriel 2C2, Arriel 2S1, Arriel 2S2
Read the AD in the Federal RegisterAD2021-05-08Effective Apr 15, 2021Safran Helicopter Engines, S.A. (Type Certificate Previously Held by Turbomeca, S.A.) Turboshaft EnginesRepetitive
Cracks have been found on soldered joints of torque conformation boxes in these turboshaft engines, causing minor flight anomalies and ground failures. This AD requires initial and repetitive inspections of the torque conformation box resistance values and replacement if needed.
Engine models named Arriel 2C, Arriel 2C1, Arriel 2S1, Arriel 2S2
Read the AD in the Federal RegisterAD2021-05-22Effective Mar 22, 2021Safran Helicopter Engines, S.A. (Type Certificate Previously Held by Turbomeca, S.A.), Turboshaft EnginesOne-time
Positive segregation (freckles) has been detected on Stage 2 high-pressure turbine disks and Stage 3 turbine wheels in certain Safran Helicopter Engines turboshaft engines. This AD requires the removal from service of affected Stage 2 HPT disks and Stage 3 turbine wheels.
Engine models named Arriel 1B, Arriel 1C, Arriel 1C2, Arriel 1D1
Read the AD in the Federal RegisterShow 45 older
AD2018-12-01Effective Sep 12, 2018Safran Helicopter Engines, S.A., Turboshaft EnginesRepetitive
The hydro-mechanical metering unit (HMU) on these engines can experience uncoupling between the low-pressure fuel pump impeller and high-pressure fuel pump shaft, which is unsafe. This AD requires inspection and possible replacement of the HMU, or incorporation of Modification TU 178.
Engine models named Arriel 2B, Arriel 2B1
Read the AD in the Federal RegisterAD2018-10-01Effective Jun 11, 2018Safran Helicopter Engines, S.A., Turboshaft EnginesOne-time
Safran Helicopter Engines reports ruptured front support pins on the accessory gearbox front support in certain Arriel 2E turboshaft engines. This AD requires replacement of the accessory gearbox front support.
Engine models named Arriel 2E
Read the AD in the Federal RegisterAD2017-15-07Effective Aug 8, 2017Safran Helicopter Engines, S.A., Turboshaft EnginesRepetitive
Fuel leaks have been reported originating from drain valve assemblies on certain Arriel turboshaft engines. This AD requires inspection and wrapping of affected drain valves, with replacement of any found to be defective.
Engine models named Arriel 1A1, Arriel 1A2, Arriel 1B, Arriel 1C, Arriel 1C1, Arriel 1C2, Arriel 1D, Arriel 1D1, Arriel 1E2, Arriel 1K1, Arriel 1S, Arriel 1S1
Read the AD in the Federal RegisterAD2017-05-08Effective Apr 13, 2017Safran Helicopter Engines, S.A. Turboshaft EnginesOne-time
A low returning spring rate in the hydro-mechanical metering unit needle can cause uncommanded in-flight shutdown on Arriel 2B turboshaft engines. The AD requires removing any pre-modification TU 158 hydro-mechanical metering unit and installing an eligible replacement part.
Engine models named Arriel 2B
Read the AD in the Federal RegisterAD2016-25-13Effective Feb 3, 2017Safran Helicopter Engines, S.A. (Formerly Turbomeca S.A.) Turboshaft EnginesRepetitive
A rupture of the 41-tooth gear in the engine accessory gearbox can cause an uncommanded in-flight shutdown. This AD requires initial and repetitive wear inspections of the engine accessory gearbox cover.
Engine models named Arriel 2B, Arriel 2B1, Arriel 2C, Arriel 2C1, Arriel 2C2, Arriel 2D, Arriel 2E, Arriel 2S1, Arriel 2S2
Read the AD in the Federal RegisterAD2016-22-10Effective Dec 6, 2016Turbomeca S.A. Turboshaft EnginesOne-time
An anomaly during grinding operations for modification TU376 on certain Arriel turboshaft engines can lead to centrifugal impeller failure and uncontained release, risking engine and helicopter damage. This AD requires removing the centrifugal impeller and replacing it with a part eligible for installation.
Engine models named Arriel 1, Arriel 1A, Arriel 1A1, Arriel 1A2, Arriel 1B, Arriel 1B2, Arriel 1C, Arriel 1C1, Arriel 1C2, Arriel 1D, Arriel 1D1, Arriel 1E
Read the AD in the Federal RegisterAD2016-11-09Effective Jul 5, 2016Turbomeca S.A. Turboshaft EnginesOne-time
Rubbing damage can occur in the labyrinth seal of Arriel 1D and 1D1 turboshaft engines with certain gas generator modules, risking engine failure and loss of helicopter control. This AD requires removing the pre-modification TU357 gas generator module and replacing it with an eligible replacement.
Engine models named Arriel 1D, Arriel 1D1
Read the AD in the Federal RegisterAD2016-08-16Effective May 25, 2016Turbomeca S.A. Turboshaft EnginesOne-time
Fuel flow non-conformities in Arriel 2E engines can cause delta-P diaphragm failure and uncommanded in-flight shutdown. This AD requires replacing the pre-TU 193 adjusted pump and metering valve assembly and the delta-P diaphragm with compliant parts.
Engine models named Arriel 2E
Read the AD in the Federal RegisterAD2016-04-14Effective Apr 1, 2016Turbomeca S.A. Turboshaft EnginesOne-time
The tachometer box on certain Turbomeca Arriel 1E2 engines can fail and cause engine failure and loss of helicopter control. This AD requires removal of the tachometer box from affected engines.
Engine models named Arriel 1E2
Read the AD in the Federal RegisterAD2016-03-02Effective Mar 15, 2016Turbomeca S.A. Turboshaft EnginesRepetitive
Torque conformation box (TCB) units in certain Turbomeca turboshaft engines may fail, causing loss of thrust control. Inspect the TCB for correct resistance values and remove any units that fail inspection before further flight.
Engine models named ARRIEL 2C, ARRIEL 2C1, ARRIEL 2C2, ARRIEL 2S1, ARRIEL 2S2
Read the AD in the Federal RegisterAD2015-13-04Effective Sep 1, 2015Turbomeca S.A. Turboshaft EnginesRepetitive
The accessory gearbox in these engines may fail, causing in-flight shutdown and engine damage. This AD requires vibration checks of the engine accessory gearbox to detect potential failures.
Engine models named Arriel 1A1, Arriel 1A2, Arriel 1B, Arriel 1C, Arriel 1C1, Arriel 1C2, Arriel 1D, Arriel 1D1, Arriel 1E2, Arriel 1K1, Arriel 1S, Arriel 1S1
Read the AD in the Federal RegisterAD2014-12-05Effective Aug 4, 2014Turbomeca S.A. Turboshaft EnginesRepetitive
Turbomeca Arriel turboshaft engines have coupling assembly and HMU drive gear shafts that may experience wear. This AD requires inspection of the splines of the coupling assembly and the hydro-mechanical metering unit drive gear shaft for wear.
Engine models named Arriel 2B, Arriel 2B1, Arriel 2C, Arriel 2C1, Arriel 2C2, Arriel 2S1, Arriel 2S2
Read the AD in the Federal RegisterAD2014-07-06Effective May 15, 2014Turbomeca S.A. Turboshaft EnginesRepetitive
Hydromechanical metering unit (HMU) constant delta pressure valves have experienced ruptures with less than 2,000 hours in service, which can damage the engine and aircraft. This AD requires replacement of the HMU and reduces the compliance interval for affected engines.
Engine models named Arriel 2B1
Read the AD in the Federal RegisterAD2013-24-05Effective Jan 28, 2014Turbomeca S.A. Turboshaft EnginesOne-time
Certain Turbomeca Arriel turboshaft engines may experience free turbine bearing lubrication loss due to chip generation in the module. The AD requires a one-time inspection of the free turbine module and repair of any discrepancies found.
Engine models named Arriel 1A1, Arriel 1A2, Arriel 1B, Arriel 1C, Arriel 1C1, Arriel 1C2, Arriel 1D, Arriel 1D1, Arriel 1E2, Arriel 1K1, Arriel 1S, Arriel 1S1
Read the AD in the Federal RegisterAD2013-22-22Effective Dec 20, 2013Turbomeca S.A. Turboshaft EnginesRepetitive
The hydromechanical metering unit (HMU) in Arriel 2D turboshaft engines can deteriorate and cause uncommanded in-flight shutdown. This AD requires replacing the HMU at a reduced life and conducting inspections of the HMU.
Engine models named Arriel 2D
Read the AD in the Federal RegisterAD2013-08-22Effective May 28, 2013Turbomeca S.A. Turboshaft EnginesRepetitive
The engine tachometer's cycle-counting feature may be inaccurate, potentially leading to uncontained engine failure. Perform daily post-flight checks of the tachometer's cycle-counting feature and ground-run functional checks within every 1,000 operating hours.
Engine models named Arriel 1A1, Arriel 1A2, Arriel 1B, Arriel 1C, Arriel 1C1, Arriel 1C2, Arriel 1D, Arriel 1D1, Arriel 1E2, Arriel 1K1, Arriel 1S, Arriel 1S1
Read the AD in the Federal RegisterAD2012-27-02Effective Feb 14, 2013Turbomeca S.A. Turboshaft EnginesRepetitive
Several Arriel 1 turboshaft engines have experienced uncommanded in-flight shutdowns. This AD requires performing a high gas generator speed (NG) rating vibration check to prevent such shutdowns.
Engine models named Arriel 1A1, Arriel 1A2, Arriel 1B, Arriel 1C, Arriel 1C1, Arriel 1C2, Arriel 1D, Arriel 1D1, Arriel 1E2, Arriel 1K1, Arriel 1S, Arriel 1S1
Read the AD in the Federal RegisterAD2012-24-03Effective Jan 7, 2013Turbomeca S.A. Turboshaft EnginesRepetitive
Dust may accumulate inside the gas generator hollow shaft and cause unbalance of the rotating assembly, leading to rear bearing failure and uncommanded engine shutdown. This AD requires determining engine history, performing a one-time visual inspection of the axial compressor for erosion, performing initial and repetitive cleaning of the gas generator hollow shaft, and replacing the rear bearing if dust collected exceeds 8 grams.
Engine models named Arriel 1A, Arriel 1A1, Arriel 1A2, Arriel 1B, Arriel 1C, Arriel 1C1, Arriel 1C2, Arriel 1D, Arriel 1D1, Arriel 1E2, Arriel 1K1, Arriel 1S
Read the AD in the Federal RegisterAD2012-23-12Effective Jan 7, 2013Turbomeca S.A. Turboshaft EnginesRepetitive
Fuel control unit 3-way union plugs on certain Turbomeca turboshaft engines may be non-compliant, creating a fuel leak and fire risk. The AD requires inspection and torque check of the plug, replacement if non-compliant, and prohibits installation of non-compliant FCUs.
Engine models named Arriel 1E2, Arriel 1S, Arriel 1S1
Read the AD in the Federal RegisterAD2012-18-18Effective Oct 24, 2012Turbomeca S.A. Turboshaft EnginesOne-time
Gas generator turbine blades in certain Turbomeca Arriel turboshaft engines may rupture, causing uncommanded in-flight shutdown and forced landing or accident. This AD requires accomplishment of the TU166 modification on affected engines.
Engine models named Arriel 2B, Arriel 2B1, Arriel 2C2, Arriel 2S2
Read the AD in the Federal RegisterAD2012-12-20Effective Jul 26, 2012Turbomeca S.A. Turboshaft EnginesOne-time
Digital engine control units (DECUs) on certain Turbomeca turboshaft engines can malfunction in flight, causing loss of automatic control and potential uncommanded engine shutdown. This AD requires replacement of affected DECUs.
Engine models named Arriel 2C1, Arriel 2C2, Arriel 2S2
Read the AD in the Federal RegisterAD2012-08-18Effective May 30, 2012Turbomeca S.A. Turboshaft EnginesOne-time
Certain power turbine blade fir-tree roots on Arriel 2B and 2B1 engines may have non-conformities that could lead to blade rupture and uncommanded engine shutdown in flight. This AD requires removing affected PT blades from service by a new reduced life limit.
Engine models named Arriel 2B, Arriel 2B1
Read the AD in the Federal RegisterAD2011-27-01Effective Jan 27, 2012Turbomeca Turboshaft EnginesOne-time
Turbomeca Arriel 1B engines can suffer hot gas ingestion leading to gas generator turbine over-temperature, potentially causing uncommanded in-flight shutdown. This AD requires corrective action to prevent turbine damage and forced landing or accident.
Engine models named Arriel 1B
Read the AD in the Federal RegisterAD2011-26-02Effective Jan 17, 2012Turbomeca Arriel 1 Series Turboshaft EnginesRepetitive
The gas generator second stage turbine disc in certain Arriel engines may fail due to fatigue, potentially releasing debris and damaging the helicopter. This AD requires reinforced eddy-current inspection of the affected discs according to revised life limits.
Engine models named Arriel 1A, Arriel 1A1, Arriel 1B, Arriel 1C, Arriel 1C1, Arriel 1C2, Arriel 1D, Arriel 1D1, Arriel 1S1
Read the AD in the Federal RegisterAD2011-24-07Effective Dec 14, 2011Turbomeca S.A. Arriel 2B Turboshaft EnginesOne-time
Turbomeca Arriel 2B turboshaft engines have an unsafe condition that requires corrective action. This AD requires operators to perform the necessary inspections and corrective measures specified in the related mandatory continuing airworthiness information.
Engine models named Arriel 2B
Read the AD in the Federal RegisterAD2011-05-08Effective Mar 9, 2011Turbomeca Model Arriel 1E2, 1S, and 1S1 Turboshaft EnginesEmergency AD
The fuel ejector in the low-pressure fuel system may be incorrectly assembled, potentially causing uncommanded engine shutdown. Inspect the fuel ejector to ensure the circlip is properly seated in its groove.
Engine models named Arriel 1E2, Arriel 1S, Arriel 1S1
Read the AD in the Federal RegisterAD2010-19-06Effective Oct 6, 2010Turbomeca Arriel 1 Series Turboshaft EnginesOne-time
An unsafe condition has been identified in Turbomeca Arriel 1 Series turboshaft engines. This AD requires operators to comply with mandatory continuing airworthiness information to correct the condition.
Engine models named Arriel 1 series
Read the AD in the Federal RegisterAD2010-10-09Effective Jun 21, 2010Turbomeca Arriel 1B, 1D, 1D1, and 1S1 Turboshaft EnginesRepetitive
2nd stage turbine blades on certain Turbomeca Arriel engines have failed in flight, causing uncommanded engine shutdown and forced landings. This AD requires lowered thresholds for initial and repetitive replacements of 2nd stage turbines on Arriel 1B, 1D, and 1D1 engines, and initial and repetitive relative position checks on affected engines.
Engine models named Arriel 1B, Arriel 1D, Arriel 1D1, Arriel 1S1
Read the AD in the Federal RegisterAD2009-08-08Effective May 7, 2010Turbomeca ARRIEL 1B, 1D, 1D1, 2B, and 2B1 Turboshaft EnginesOne-time
This AD addresses an unsafe condition identified in Turbomeca turboshaft engines. Operators must comply with the mandatory continuing airworthiness information to correct the identified defect.
Engine models named ARRIEL 1B, ARRIEL 1D, ARRIEL 1D1, ARRIEL 2B, ARRIEL 2B1
Read the AD in the Federal RegisterAD2010-04-07Effective Mar 23, 2010Turbomeca Arriel 2S1 Turboshaft EnginesOne-time
This AD addresses an unsafe condition identified on Turbomeca Arriel 2S1 turboshaft engines. Operators must comply with the mandatory continuing airworthiness information to correct the identified unsafe condition.
Engine models named Arriel 2S1
Read the AD in the Federal RegisterAD2010-02-01Effective Feb 18, 2010Turbomeca S.A. Model Arriel 1B, 1D, and 1D1 Turboshaft EnginesOne-time
An unsafe condition has been identified on Turbomeca Arriel turboshaft engines. This AD requires corrective action to address the condition.
Engine models named Arriel 1B, Arriel 1D, Arriel 1D1
Read the AD in the Federal RegisterAD2009-26-07Effective Jan 12, 2010Turbomeca Arriel 1A1, 1A2, 1B, 1C, 1C1, 1C2, 1D, 1D1, 1E2, 1K1, 1S, and 1S1 Turboshaft EnginesRepetitive
Certain Turbomeca Arriel turboshaft engine reduction gearboxes may leak oil, leading to uncommanded in-flight engine shutdown, engine fire, or emergency autorotation landing. The AD requires initial and repetitive visual inspections for oil leakage, repair if needed, and offers optional terminating actions including replacement or repair of affected modules.
Engine models named Arriel 1A1, Arriel 1A2, Arriel 1B, Arriel 1C, Arriel 1C1, Arriel 1C2, Arriel 1D, Arriel 1D1, Arriel 1E2, Arriel 1K1, Arriel 1S, Arriel 1S1
Read the AD in the Federal RegisterAD2009-09-03Effective Jun 1, 2009Turbomeca S.A. Arriel 2B and 2B1 Turboshaft EnginesOne-time
Turbomeca Arriel 2B and 2B1 turboshaft engines installed on certain Eurocopter helicopters have an unsafe condition. This AD requires specific corrective actions to address the identified safety issue.
Engine models named Arriel 2B, Arriel 2B1
Read the AD in the Federal RegisterAD2009-01-11Effective Feb 27, 2009Turbomeca Arriel 2B and 2B1 Turboshaft EnginesOne-time
An unsafe condition has been identified on Turbomeca Arriel 2B and 2B1 turboshaft engines. Operators must comply with the corrective actions specified in this airworthiness directive.
Engine models named Arriel 2B, Arriel 2B1
Read the AD in the Federal RegisterAD2007-24-10Effective Dec 14, 2007Turbomeca Arriel 2S1 and 2S2 Turboshaft EnginesOne-time
An unsafe condition has been identified on Turbomeca Arriel turboshaft engines. Operators must comply with corrective actions as specified in the AD.
Engine models named Arriel 2S1, Arriel 2S2
Read the AD in the Federal RegisterAD2007-10-06Effective May 29, 2007Turbomeca Arriel 2B1 Turboshaft EnginesOne-time
This AD addresses an unsafe condition on Turbomeca Arriel 2B1 turboshaft engines identified through mandatory continuing airworthiness information. The AD requires operators to take corrective action as specified to ensure continued airworthiness of affected engines.
Engine models named Arriel 2B1
Read the AD in the Federal RegisterAD2007-02-17Effective Mar 2, 2007Turbomeca Arriel 1 Series Turboshaft EnginesOne-time
Turbomeca Arriel 1 series turboshaft engines have an unsafe condition that requires correction. The FAA has adopted an airworthiness directive to identify and correct this condition based on mandatory continuing airworthiness information from another country.
Engine models named Arriel 1 series
Read the AD in the Federal RegisterAD2006-06-17Effective Apr 27, 2006Turbomeca Arriel 1B, 1D, and 1D1 Turboshaft EnginesRepetitive
Second stage turbine nozzle guide vanes may develop cracks from wall thinning, risking blade fracture and engine shutdown. This AD requires inspecting NGV2 wall thickness to detect damage.
Engine models named Arriel 1B, Arriel 1D, Arriel 1D1
Read the AD in the Federal RegisterAD2005-25-13Effective Dec 28, 2005Turbomeca Arriel 2B and 2B1 Turboshaft EnginesRepetitive
Free turbine shields on these engines have developed large circumferential cracks that can cause engine failure and in-flight shutdown. The AD requires initial and repetitive visual inspections of the free turbine shield for cracks.
Engine models named Arriel 2B, Arriel 2B1
Read the AD in the Federal RegisterAD2003-16-03Effective Sep 12, 2003Turbomeca Arriel 1 Series Turboshaft EnginesRepetitive
The 2nd stage turbine disk may rub on the 2nd stage turbine nozzle guide vanes, causing engine rubbing noise and potentially leading to complete engine failure. The AD requires repetitive checks for engine rubbing noise and free rotation of the gas generator, or installation of modification TU 202 to terminate these checks.
Engine models named Arriel 1 A
Read the AD in the Federal RegisterAD2003-11-08Effective Jul 3, 2003Turbomeca S.A. Arriel -1B, -1D, and -1D1 Series Turboshaft EnginesOne-time
Second stage gas generator turbine blades in certain Turbomeca Arriel engines have failed in flight, causing engine shutdown. Owners must replace M03 modules that were modified to TU 204 standard with unmodified M03 modules.
Engine models named Arriel -1B, Arriel -1D, Arriel -1D1
Read the AD in the Federal RegisterAD2003-03-12Effective Mar 7, 2003Turbomeca S.A. Arriel 1 A2, 1 C, 1 C1, 1 C2, 1 D, 1 D1, 1 E2, 1 K, 1 K1, 1 S, 1 S1 and Arriel 2 B, 2 B1, 2 C, 2 C1, 2 S1 Series Turboshaft EnginesOne-time
Several cases of centrifugal compressor impeller blade ruptures have occurred in service, which can cause acoustic excitation leading to contained blade ruptures and power loss. This AD requires insertion and bonding of a sleeve in the compressor bleed valve attachment boss to prevent these failures.
Engine models named Arriel 1 A2, Arriel 1 C, Arriel 1 C1, Arriel 1 C2, Arriel 1 D, Arriel 1 D1, Arriel 1 E2, Arriel 1 K, Arriel 1 K1, Arriel 1 S, Arriel 1 S1, Arriel 2 B
Read the AD in the Federal RegisterAD2002-16-25Effective Sep 26, 2002Turbomeca S.A. Arriel Models 2 S1, 2 B, and 2 C Turboshaft EnginesRepetitive
Turbomeca Arriel fuel pumps may have below-minimum wall thickness or develop fuel leaks, risking engine fires and in-flight shutdown. This AD requires initial and repetitive visual inspections for fuel leaks and replacement or removal of defective fuel pumps.
Engine models named Arriel 2 B, Arriel 2 C, Arriel 2 S1
Read the AD in the Federal RegisterAD2002-14-26Effective Aug 6, 2002Turbomeca S.A. Arriel Models 1A, 1A1, 1B, 1D, and 1D1 Turboshaft EnginesOne-time
The cantilevered axis of the free turbine can move from its design position and cause blade trajectories to exceed the current containment area, potentially leading to uncontainment during an overspeed event and helicopter damage. This AD requires installation of containment shield rings around the free turbine blade area and a double support around the gearbox free turbine bearing housing.
Engine models named Arriel 1A, Arriel 1A1, Arriel 1B, Arriel 1D, Arriel 1D1
Read the AD in the Federal RegisterAD2000-20-01Effective Oct 17, 2000Turbomeca Arriel 1 Series Turboshaft EnginesOne-time
Turbomeca Arriel 1 series turboshaft engines may experience gas generator rear bearing failure, which could lead to uncommanded engine shutdown. Install a chip detector with electronic warning on the rear bearing oil return system.
Engine models named Arriel 1 A, Arriel 1 A1, Arriel 1 A2, Arriel 1 B, Arriel 1 C, Arriel 1 C1, Arriel 1 C2, Arriel 1 D, Arriel 1 D1, Arriel 1 K, Arriel 1 K1, Arriel 1 S
Read the AD in the Federal RegisterAlerts for the Arriel
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