# Service difficulty reports: MBB BK 117 A-3

A list on [MBB BK 117 A-3](https://openairdocs.org/model/mbb-bk-117-a-3.md).

Newest first. General aviation reporting is voluntary.

Page 1 of 15 · 719 reports

- [SDR QMLA2014022314018](https://openairdocs.org/sdr/QMLA2014022314018.md): Door · missing · Feb 23, 2014 · N420MB · Bolkms BK117A3 · Hydraulic Compartment Doors
  > THE PILOT NOTICED THAT THE HYD INSPECTION DOOR ON THE FWD TRANSMISSION DECK CREST COWLING WAS MISSING FROM THE ACFT DURING A PREFLIGHT INSPECTION. OBTAINED & INSTALLED A SERVICEABLE INSPECTION DOOR. NO OTHER INFORMATION IS KNOWN AT THIS TIME CONCERNING THE W
- [SDR QMLA2013012913020](https://openairdocs.org/sdr/QMLA2013012913020.md): Gearbox · making metal · Jan 29, 2013 · N952CJ · Bolkms BK117A3 · Tail Rotor Gearbox
  > DURRING "GROUND RUN," THE INTERMEDIATE GEAR BOX CAUSED THE TAILROTOR GEARBOX ANNUNCIATOR LIGHT TO ILLUMINATE. CHIP PLUG WAS EXAMINED. OEN CHIP FOUND, CLASIFIED AS "D." THE GEARBOX WAS REPLACED WITHOUT INCIDENT.
- [SDR QMLA2012031412045](https://openairdocs.org/sdr/QMLA2012031412045.md): Frame · cracked · Mar 14, 2012 · N911BK · Bolkms BK117A3 · Rotorcraft Tail Boom
  > DURING VISUAL INSPECTION OF VERTICAL FIN INNER AND OUTER SURFACE, A CRACK WAS NOTED ON THE LT SIDE CAMLOC FRAME THAT SUPPORTS THE VERTICAL FIN COWL. THE CRACK IS APPROXIMATELY 2 INCHES IN LENGTH LOCATED BETWEEN THE 4TH CAMLOC RECEPTACLE COUNTING UP FROM THE
- [SDR QMLA2011120711117](https://openairdocs.org/sdr/QMLA2011120711117.md): Pump · inoperative · Dec 7, 2011 · N911BK · Bolkms BK117A3 · Fuel Boost Pump
  > FWD FUEL TRANSFER PUMP CAUTION LIGHT ILLUMINATED DURING CRUISE FLIGHT. PILOT DIVERTED AND RETURNED TO THE HOME BASE AND PERFORMED A PRECAUTIONARY LANDING. TROUBLSHOOTING REVEALED THE FORWARD TRANSFER FUEL PUMP WAS INOPERATIVE. PUMP REPLACED WITH AN OVERHAUL
- [SDR QMLA2011111611109](https://openairdocs.org/sdr/QMLA2011111611109.md): Spar · cracked · Nov 16, 2011 · N420MB · Bolkms BK117A3 · Rotorcraft Tail Boom
  > DURING INSPECTION, FOUND A CRACK IN THE TAILBOOM VERTICAL FIN MAIN SPAR. OPEN.
- [SDR QMLA2011081711087](https://openairdocs.org/sdr/QMLA2011081711087.md): Frame · cracked · Aug 17, 2011 · N420MB · Bolkms BK117A3 · Rotorcraft Tail Boom
  > THE MECHANIC FOUND A CRACK IN THE TAILBOOM AT FRAME 10L, DURING A SCHEDULED INSP.
- [SDR RMXADMR334393](https://openairdocs.org/sdr/RMXADMR334393.md): Skin · scratched · Apr 14, 2011 · N1140H · Bolkms BK117A3 · Rotorcraft Tail Boom
  > A.012" DEEP.3750" LONG SCRATCH WAS FOUND ON THE RT SIDE OF THE TAIL BOOM UNDER THE OMEGA STRINGER, 12 INCHES AFT OF THE CONNECTING FLANGE.
- [SDR QMLA2011012911017](https://openairdocs.org/sdr/QMLA2011012911017.md): Chip Detector · contaminated · Jan 29, 2011 · N420MB · Bolkms BK117A3 · Engine Fuel Indicating System
  > NR 2 ENGINE CHIP LIGHT ILLUMINATED ALONG WITH THE MASTER CAUTION LIGHT. PILOT NOTED THAT THERE WERE NO N2 FLUCTUATIONS. AIR RETURNED AND ATTEMPTED A CHIP BURN WITH NEGATIVE RESULTS. PERFORMED SHUTDOWN OF THE NR 2 ENGINE. LANDED WITHOUT INCIDENT. MECHANIC
- [SDR RMXA091420097023](https://openairdocs.org/sdr/RMXA091420097023.md): Keelbeam · corroded · Sep 11, 2009 · N117M · Bolkms BK117A3 · Fuselage Main, Keel
  > DURING OTHER UNSCHEDULED MX, CORROSION WAS DISCOVERED ON BOTH FUSELAGE KEEL BEAM CAPS; PN 117-21303-05. A REPAIR SCHEME WAS REQUESTED AND RECEIVED FROM THE MFG. CORRODED AREAS OF THE KEEL BEAM CAPS WILL BE REMOVED AND REPAIR SPLICES INSTALLED.
- [SDR RMXA090120097078](https://openairdocs.org/sdr/RMXA090120097078.md): Skin · cracked · Sep 1, 2009 · N1140H · Bolkms BK117A3 · Rotorcraft Tail Boom
  > DURING A SCHEDULED INSP, A 1.5 INCH LONG CRACK WAS DISCOVERED ON THE LT TAILBOOM SKIN. THE CRACK STARTS AT THE CUTOUT OPENING FOR THE HORIZ STAB AND EXTENDS UPWARD.
- [SDR RMXA061020097097](https://openairdocs.org/sdr/RMXA061020097097.md): Attach Fitting · cracked · Jun 10, 2009 · N118LL · Bolkms BK117A3 · Rotorcraft Tail Boom
  > DURING A SCHEDULED INSP, THE TAIL ROTOR GEARBOX ATTACH FITTING WAS DISCOVERED CRACKED IN THE UPPER LT CORNER. FITTING WAS REMOVED AND REPLACED WITH A NEW FITTING.
- [SDR BAQA20080015](https://openairdocs.org/sdr/BAQA20080015.md): O-Ring · damaged · Apr 19, 2008 · N118NC · Bolkms BK117A3 · Cabin Cooling System
  > DURING DESCENT TO LAND CREW SMELT (STRANGE ODOR) COMING FROM THE AIR CONDITIONING GASPERS. DEACTIVATING ENVIRONMENT CONTROL UNIT CEASED ODOR. AFTER LANDING INSPECTION MAINTENANCE PERSONNEL DISCOVERED A SPLIT IN THE (INDUCTOR) TUBE BETWEEN THE TEMPERATURE CON
- [SDR BAQA20080041](https://openairdocs.org/sdr/BAQA20080041.md): O-Ring · damaged · Apr 19, 2008 · N118NC · Bolkms BK117A3 · Cabin Cooling System
  > CRUISE FLIGHT, CLOSE TO FLIGHT DESTINATION, CREW SMELLED "STRANGE ODOR" IN CABIN/COCKPIT. PILOT TURNED OFF THE ENVIRONMENTAL CONTROL UNIT AND SMELL CEASED. INSPECTION OF ECU REVEALED THAT THE "INDUCTOR" PIPE TEMPERATURE CONTROLLER TO COOLING TURBINE HAD A SM
- [SDR BAQA20080021](https://openairdocs.org/sdr/BAQA20080021.md): O-Ring · blown · Apr 19, 2008 · N118NC · Bolkms BK117A3 · Cabin Cooling System
  > CRUISE FLIGHT, CLOSE TO FLIGHT DESTINATION, CREW SMELLED "STRANGE ODOR" IN CABIN/COCKPIT. PILOT TURNED OFF THE ENVIRONMENTAL CONTROL UNIT AND SMELL CEASED. INSPECTION OF ECU REVEALED THAT THE "INDUCTOR" PIPE TEMPERATURE CONTROLLER TO COOLING TURBINE HAD A SM
- [SDR BAQA200800003](https://openairdocs.org/sdr/BAQA200800003.md): O-Ring · damaged · Apr 19, 2008 · N118NC · Bolkms BK117A3 · Cabin Cooling System
  > CRUISE FLIGHT, CLOSE TO FLIGHT DESTINATION CREW SMELLED "STRANGE ODOR" IN CABIN/COCKPIT. PILOT TURNED OFF THE ENVIRONMENTAL CONTROL UNIT AND SMELL CEASED. INSPECTION OF ECU REVEALED THAT THE "INDUCTOR" PIPE TEMPERATURE CONTROLLER TO COOLING TURBINE HAD A SMA
- [SDR BAQA20080009](https://openairdocs.org/sdr/BAQA20080009.md): O-Ring · blown · Apr 19, 2008 · N118NC · Bolkms BK117A3 · Cabin Cooling System
  > CRUISE FLIGHT, CLOSE TO FLIGHT DESTINATION, CREW SMELLED "STRANGE ODOR" IN CABIN/COCKPIT. PILOT TURNED OFF THE ENVIRONMENTAL CONTROL UNIT AND SMELL CEASED. INSPECTION OF ECU REVEALED THAT THE "INDUCTOR" PIPE TEMPERATURE CONTROLLER TO COOLING TURBINE HAD A SM
- [SDR BAQA20080006](https://openairdocs.org/sdr/BAQA20080006.md): O-Ring · damaged · Apr 19, 2008 · N118NC · Bolkms BK117A3 · Cabin Cooling System
  > CRUISE FLIGHT, CLOSE TO FLIGHT DESTINATION, CREW SMELLED "STRANGE ODOR" IN CABIN/COCKPIT. PILOT TURNED OFF THE ENVIRONMENTAL CONTROL UNIT AND SMELL CEASED. INSPECTION OF ECU REVEALED THAT THE "INDUCTOR" PIPE TEMPERATURE CONTROLLER TO COOLING TURBINE HAD A SM
- [SDR BAQA20080005](https://openairdocs.org/sdr/BAQA20080005.md): O-Ring · damaged · Apr 19, 2008 · N118NC · Bolkms BK117A3 · Cabin Cooling System
  > CRUISE FLIGHT, CLOSE TO FLIGHT DESTINATION, CREW SMELT "STRANGE ODOR" IN CABIN/COCKPIT. PILOT TURNED OFF THE ENVIRONMENTAL CONTROL UNIT (ECU) AND SMELL CEASED. INSPECTION OF ECU REVEALED THAT THE "INDUCTOR" PIPE TEMPERATURE CONTROLLER TO COOLING TURBINE HAD
- [SDR BAQA20080004](https://openairdocs.org/sdr/BAQA20080004.md): O-Ring · damaged · Apr 19, 2008 · N118NC · Bolkms BK117A3 · Cabin Cooling System
  > CRUISE FLIGHT, CLOSE TO FLIGHT DESTINATION, CREW SMELLED "STRANGE ODOR" IN CABIN/COCKPIT. PILOT TURNED OFF THE ENVIRONMENTAL CONTROL UNIT AND SMELL CEASED. INSPECTION OF ECU REVEALED THAT THE "INDUCTOR" PIPE TEMPERATURE CONTROLLER TO COOLING TURBINE HAD A SM
- [SDR BAQA20080003](https://openairdocs.org/sdr/BAQA20080003.md): O-Ring · damaged · Apr 19, 2008 · N118NC · Bolkms BK117A3 · Cabin Cooling System
  > CRUISE FLIGHT, CLOSE TO FLIGHT DESTINATION, CREW SMELLED "STRANGE ODOR" IN CABIN/COCKPIT. PILOT TURNED OFF THE ENVIRONMENTAL CONTROL UNIT AND SMELL CEASED. INSPECTION OF ECU REVEALED THAT THE "INDUCTOR" PIPE TEMPERATURE CONTROLLER TO COOLING TURBINE HAD A SM
- [SDR 706704192008](https://openairdocs.org/sdr/706704192008.md): Ecs · malfunctioned · Apr 19, 2008 · N118NC · Bolkms BK117A3 · Cabin Cooling System
  > AIRCRAFT WAS ALMOST AT DESTINATION WHEN THE CREW SMELLED SEVERAL STRANGE ODORS. CREW THOUGHT THE SMELLS WERE COMING FROM NUMEROUS FIRES ON THE GROUND IN THE AREA. NURSE IN BACK OF AIRCRAFT REPORTED SMOKE COMING FROM THE ENVIRONMENTAL SYSTEM VENTS IN THE AIRCRA
- [SDR RMXA10282007](https://openairdocs.org/sdr/RMXA10282007.md): Doubler · cracked · Oct 28, 2007 · N1140H · Bolkms BK117A3 · Rotorcraft Tail Boom
  > LT TAILBOOM DOUBLER (FASTENER) HAS A 1.5 INCH LONG CRACK IN THE DOUBLER ONLY.
- [SDR 10252007](https://openairdocs.org/sdr/10252007.md): Skin · cracked · Oct 24, 2007 · N1140H · Bolkms BK117A3 · Rotorcraft Tail Boom
  > DURING DAILY INSPECTION, A 1 INCH LONG CRACK WAS DISCOVERED ON A TAIL BOOM SHEET METAL DOUBLER, LT SIDE, JUST AFT OF THE HORIZONTAL STABILIZER.
- [SDR 2758071607](https://openairdocs.org/sdr/2758071607.md): Skin · cracked · Jul 16, 2007 · N117MH · Bolkms BK117A3 · Ventral Structure
  > 1 INCH LONG SKIN CRACK FOUND ON IB SIDE OF VERTICAL STABILIZER SKIN.
- [SDR 200706092204](https://openairdocs.org/sdr/200706092204.md): Bearing · binding · Jun 9, 2007 · N112LL · Bolkms BK117A3 · Tail Rotor Head
  > PILOT EXPERIENCED BINDING IN THE T/R CONTROLS. DIRT WAS FOUND IN T/R GRIP BEARINGS CAUSING BINDING IN CONTROL.
- [SDR BAQA20060007](https://openairdocs.org/sdr/BAQA20060007.md): Frame · cracked · Nov 15, 2006 · N932CJ · Bolkms BK117A3 · Fuselage Main, Frame
  > CRACK FOUND IN OVER HEAD FRAME. DETERMINED TO BE MINOR REPAIR. REPAIRED BY INSTALLING DOUBLERS IAW AC 43.13-1B MM.
- [SDR BAQA20060006](https://openairdocs.org/sdr/BAQA20060006.md): Retaining Nut · loose · Nov 13, 2006 · N118NC · Bolkms BK117A3 · Turbine Section
  > POWER TURBINE WHEEL RETENTION NUT LOST TORQUE. DISCOVERED BY N2 FLUCTUATION ACCOMPANIED BY A CHIP LIGHT.
- [SDR 7110650](https://openairdocs.org/sdr/7110650.md): Manifold · leaking · Jun 5, 2006 · N117NY · Bolkms BK117A3 · Aircraft Fuel Distribution System
  > ON POST FLIGHT AFTER MISSION WAS COMPLETED, PILOT FOUND FUEL LEAKING FROM THE NR 2 ENGINE FUEL MANIFOLD.
- [SDR EGRA2005211](https://openairdocs.org/sdr/EGRA2005211.md): Panel · fire · Feb 10, 2005 · N135CP · Bolkms BK117A3 · Flight Compartment Lighting
  > PILOT REPORTED MOMENTARY SMOKE, SPARKS, AND POSSIBLE FLAMES IN OVERHEAD CIRCUIT BREAKER PANEL. CIRCUIT BREAKER FOR PILOT INSTRUMENT LIGHTS POPPED AND SMOKE AND SPARKS STOPPED. THIS OCCURRED BETWEEN LOM (WINGS FIELD) AND NO2 (KEYSTONE HELIPORT). NO PATIENT O
- [SDR BAQA094291](https://openairdocs.org/sdr/BAQA094291.md): Starter Gen · failed · Apr 29, 2004 · N117LG · Bolkms BK117A3 · Starter-Generator
  > EXCHANGE. BATTERY DISCHARGE LIGHT ON AUD MOTOR ARCHING ON ARMATURE WITH POWER ON. HARDCARD ENCLOSED. REPLACED WITH SERVICABLE UNIT. 06/02/2004
- [SDR BAQA094262](https://openairdocs.org/sdr/BAQA094262.md): Spline · worn · Apr 28, 2004 · N911BK · Bolkms BK117A3 · Starter-Generator
  > SPLINE WORN BEYOND LIMITS. REPLACED WITH SERVICEABLE UNIT, 05/20/2004
- [SDR BAQA093911](https://openairdocs.org/sdr/BAQA093911.md): Modulator · inoperative · Mar 10, 2004 · N117LG · Bolkms BK117A3 · Compressor Bleed Control
  > UNIT REMOVED FOR OVERHAUL. PART WAS INSTALLED ON ENG S/N LE45239, BUT ENGINE WAS ORIGINALLY INSTALLED ON A/C S/N 7068. INSTALLED ON 5/4/99 AT ENG TT 3407.8 AND REMOVED ON 08/24/200 AT 4181.0, THEN REINSTALLED ON 08/24/2000 AT 4182.0, AND REMOVED CURRENTLY ON
- [SDR BAQA092102](https://openairdocs.org/sdr/BAQA092102.md): Commutator · burned · Jan 20, 2004 · N39188 · Bolkms BK117A3 · Starter-Generator
  > COMMUTATOR PITTED AND BURNED. HARDCARD ENCLOSED. REPLACED WITH SERVICABLE UNIT. 02/02/2004
- [SDR BAQA091931](https://openairdocs.org/sdr/BAQA091931.md): Starter Gen · failed · Jan 9, 2004 · N117LG · Bolkms BK117A3 · Starter-Generator
  > STARTER GENERATOR WILL NOT COME ONLINE. REPLACED WITH SERVICEABLE UNIT. 01/15/2004
- [SDR BAQA091862](https://openairdocs.org/sdr/BAQA091862.md): Compensator · cracked · Jan 8, 2004 · N952CJ · Bolkms BK117A3 · Integrated Flight System
  > BASE OF HSI COMPENSATOR IS CRACKED REPLACED WITH SERVICEABLE UNIT (S/N 17507).
- [SDR BAQA091479](https://openairdocs.org/sdr/BAQA091479.md): Starter Gen · inoperative · Dec 10, 2003 · N117LG · Bolkms BK117A3 · Starter-Generator
  > NR 2 ENGINE WOULD NOT CRANK/START. PART REPLACED WITH SERVICABLE UNIT. 12/30/2003
- [SDR BAQA090586](https://openairdocs.org/sdr/BAQA090586.md): Fuel Control · malfunctioned · Oct 22, 2003 · N911BK · Bolkms BK117A3 · Fuel Control/Turbine Engines
  > ENGINE FLAME-OUT DURING OVERSPEED CHECKS. REPLACED WITH SERVICEABLE UNIT. 11/3/03
- [SDR BAQA089833](https://openairdocs.org/sdr/BAQA089833.md): Indicator · inoperative · Oct 15, 2003 · N39181 · Bolkms BK117A3 · DME/TACAN System
  > DME INDICATOR UNIT WILL NOT FUNCTION AT ALL. REPLACED WITH SERVICEABLE UNIT.
- [SDR BAQA090690](https://openairdocs.org/sdr/BAQA090690.md): Pump · inoperative · Oct 13, 2003 · N117LG · Bolkms BK117A3 · Fuel Boost Pump
  > WILL NOT TRANSFER FUEL. THIS PUMP WAS ACCIDENTALLY SENT OUT FOR REPAIR REPLACED WITH SERVICEABLE, ASSET UNIT.
- [SDR BAQA089448](https://openairdocs.org/sdr/BAQA089448.md): Transceiver · malfunctioned · Sep 26, 2003 · N39181 · Bolkms BK117A3 · VHF Communications System
  > UNIT WILL NOT POWER UP AT ALL.COMPLETELY INOPERATIVE. ALSO, IT HAS A BURNED ODOR. REPLACED WITH SERVICEABLE UNIT.
- [SDR BAQA088916](https://openairdocs.org/sdr/BAQA088916.md): Pump · inoperative · Sep 2, 2003 · N39188 · Bolkms BK117A3 · Fuel Boost Pump
  > BOOST PUMP INOPERATIVE. REPLACED WITH SERVICEABLE UNIT.
- [SDR BAQA088880](https://openairdocs.org/sdr/BAQA088880.md): Hsi · stuck · Aug 30, 2003 · N911BK · Bolkms BK117A3 · Directional Gyro and Indicating System
  > COMPASS CARD STICKING. REPLACED WITH SERVICEABLE UNIT.
- [SDR AELLCDG001](https://openairdocs.org/sdr/AELLCDG001.md): Hydraulic System · misoverhauled · Aug 27, 2003 · Bolkms BK117A3 · Hydraulic System, Main
  > SEVERAL COMPONENTS OF THIS TANDEM HYDRAULIC UNIT RECENTLY OVERHAULED, SEEM TO HAVE BEEN TREATED IN A WAY THAT NEITHER CORRESPONDS TO THE ORIGINAL DRAWINGS/SPECIFICATIONS OF THE UNIT NOR THE MBB-BK 117 REPAIR MANUAL (REM, CHAPTER 401)
- [SDR BAQA088841](https://openairdocs.org/sdr/BAQA088841.md): Pump · inoperative · Aug 25, 2003 · N117LG · Bolkms BK117A3 · Fuel Boost Pump
  > BOOST PUMP INOPERATIVE. REPLACED WITH SERVICEABLE UNIT.
- [SDR BAQA088836](https://openairdocs.org/sdr/BAQA088836.md): Altimeter · will not test · Aug 22, 2003 · N39181 · Bolkms BK117A3 · Altimeter, Barometric/Encoder
  > RADAR ALTIMETER UNIT WILL NOT TEST. WHEN KNOB IS PUSHED TO SET FLAG, YOU CAN FEEL IT SLIPPING AND RATCHETING. REPLACED WITH SERVICEABLE UNIT.
- [SDR BAQA088802](https://openairdocs.org/sdr/BAQA088802.md): Pump · inoperative · Aug 20, 2003 · N932CJ · Bolkms BK117A3 · Fuel Boost Pump
  > BOOSTER PUMP WOULD NOT PUMP. REPLACED WITH SERVICEABLE UNIT.
- [SDR BAQA088334](https://openairdocs.org/sdr/BAQA088334.md): Sensor · malfunctioned · Aug 6, 2003 · N39181 · Bolkms BK117A3 · Engine Temperature Indicating System
  > PILOTS REPORTED TEMP SENSOR ASSY TOT SPLITS. POSSIBLE INTERNAL AIR LEAK IN TEMP. COMPENSATOR. REPLACED WITH SERVICEABLE UNIT.
- [SDR BAQA088273](https://openairdocs.org/sdr/BAQA088273.md): Relay · intermittent · Jul 30, 2003 · N911BK · Bolkms BK117A3 · Exterior Lighting
  > LAMP RELAY INTERMITTENT. EXTEND AND RETRACT MOTOR ROUGH. REPLACED WITH SERVICEABLE UNIT.
- [SDR BAQA088235](https://openairdocs.org/sdr/BAQA088235.md): Gyro · malfunctioned · Jul 29, 2003 · N911BK · Bolkms BK117A3 · Directional Gyro and Indicating System
  > SLOW TO SLAVE TO HEADING. SPEX FILE; 128575 REPLACED WITH SERVICEABLE UNIT.
- [SDR BAQA087116](https://openairdocs.org/sdr/BAQA087116.md): Indicator · malfunctioned · Jul 23, 2003 · N117LC · Bolkms BK117A3 · Weather Radar System
  > ERRONEOUS DISPLAY OF STORMS ON CLEAR DAY. RMA#: 49821 REPLACED WITH ANOTHER SERVICEABLE RENTAL UNIT WHILE OURS IS BEING REPAIRED.

Next page: https://openairdocs.org/model/mbb-bk-117-a-3/reports.md?page=2

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy
FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet'
WHERE aircraft_model_key = 'BK117A3'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/model/mbb-bk-117-a-3/reports

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