# Service difficulty reports: N170MC A list on [N170MC](https://openairdocs.org/aircraft/N170MC.md). Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. Newest first. - [SDR QMLA2013092013136](https://openairdocs.org/sdr/QMLA2013092013136.md): Doubler · cracked · Sep 20, 2013 · N170MC · Bolkms BK117B1 · Rotorcraft Tail Boom > FWD "ECU" MOUNT WAS LOOSE WITH BLIND FASTNERS MISSING. REMOVED THE FWD MOUNT AND FOUND A 40MM LONG CRACK UNDER THE MOUNT ON THE TAIL CONE DOUBLER, PN 117-22130, JUST FWD OF FRAME/STA 6135. THIS IS A COMMON DISCREPANCY ON THIS ACFT WITH A "ECS" INSTALLED. CO - [SDR 2011FA0000618](https://openairdocs.org/sdr/2011FA0000618.md): Indicator · damaged · Sep 21, 2011 · N170MC · Bolkms BK117B1 · DME/TACAN System > DME UNREADABLE. CO-PILOTS MASTER CAUTION LIGHT BARELY VISIBLE WHEN LIT. DH LIGHT ON RADAR ALTIMETER IS INTERMITTENT AND BARELY VISIBLE WHEN LIT. MAST MOMENT WARNING LIGHT BARELY VISIBLE WHEN LIT AND THE COLOR OF THE LIGHT HAS BEEN CHANGED FROM "RED" TO "GREEN" - [SDR RMXA022220107217](https://openairdocs.org/sdr/RMXA022220107217.md): Guide · worn · Feb 22, 2010 · N170MC · Bolkms BK117B1 · Passenger/Crew Doors > DURING FLIGHT, A CREWMEMBER NOTICED A GAP ON THE LOWER EDGE OF THE RT SLIDING DOOR. AN UNSCHEDULED LANDING WAS PERFORMED & THE DOOR WAS SECURED. FLIGHT CONTINUED WITHOUT ANY FURTHER INCIDENT. MX REPLACED A WORN GUIDE PN 117-24273-2 & WORN CATCHER PN 117-242 - [SDR RMXA080420097217](https://openairdocs.org/sdr/RMXA080420097217.md): Skin · cracked · Aug 4, 2009 · N170MC · Bolkms BK117B1 · Rotorcraft Tail Boom > DURING A DAILY INSPECTION, A 2.5" LONG CRACK WAS DISCOVERED ON THE LT TAILBOOM SKIN STARTING AT THE FORWARD END OF THE OPENING FOR THE HORIZONTAL STABILIZER. CRACK WAS STOP DRILLED AND A REPAIR SCHEME REQUEST HAS BEEN SUBMITTED FROM THE MANUFACTURE FOR REPAIR. - [SDR RMXA062620097217](https://openairdocs.org/sdr/RMXA062620097217.md): Blade · debonded · Jun 26, 2009 · N170MC · Bolkms BK117B1 · Main Rotor Blades > DURING FLIGHT, A NOISE WAS HEARD IN THE MAIN ROTOR SYS, FOLLOWED BY A VIBRATION THAT INCREASED. A PRECAUTIONARY LANDING WAS PERFORMED. FOUND EROSION TAPE HAD SEPARATED FROM NR1 MAIN ROTOR BLADE. WHEN THE TAPE SEPARATED, IT ALSO PULLED UP SOME FILLER MATERIA - [SDR 7217071607](https://openairdocs.org/sdr/7217071607.md): Drive Shaft · damaged · Jul 16, 2007 · N170MC · Bolkms BK117B1 · Tail Rotor Drive Shaft > FOUND DURING INSPECTION, THE FORWARD TAIL ROTOR DRIVESHAFT WAS FOUND TO HAVE A DEEP GROOVE WORN INTO THE TUBE NEAR THE END OF THE SHAFT EXCEEDING THE MECHANICAL DAMAGE LIMITS. DAMAGE WAS CAUSED BY LOOSE REINFORCING WIRE FROM A NEARBY SCAT TUBE FOR THE AIR CO - [SDR 20000413SH028](https://openairdocs.org/sdr/20000413SH028.md): Gyro · failed · Jan 31, 2000 · N170MC · Bolkms BK117B1 · Attitude Gyro and Indicating System > ATTITUDE GYRO WILL NOT CAGE. TECHNICIAN STATED UNIT ONLY WORKED FOR ONE WEEK AFTER INSTALLATION. REMOVED AND REPLACED. (X) - [SDR 20000413SH027](https://openairdocs.org/sdr/20000413SH027.md): Blade · debonded · Jan 24, 2000 · N170MC · Bolkms BK117B1 · Main Rotor Blades > LEADING EDGEOF MAIN ROTOR BLADE DEBONDING (INBOARD JOINT). 193.4 HOURS SINCE REPAIR/OVERHAUL. REMOVED AND REPLACED. (X) - [SDR 99ZZZX906](https://openairdocs.org/sdr/99ZZZX906.md): Indicator · malfunctioned · Aug 26, 1998 · N170MC · Bolkms BK117B1 · Engine RPM Indicating System > TACHOMETER'S NR 1 AND NR 2 NEEDLE SPLIT 2 PERCENT. REMOVED AND REPLACED. - [SDR 98ZZZX2080](https://openairdocs.org/sdr/98ZZZX2080.md): Pickup · failed · May 15, 1998 · N170MC · Bolkms BK117B1 · Engine RPM Indicating System > NG PICKUP INOPERATIVE. REPLACED NG PICKUP. - [SDR 98ZZZX1516](https://openairdocs.org/sdr/98ZZZX1516.md): Blade · debonded · Jan 11, 1998 · N170MC · Bolkms BK117B1 · Tail Rotor Blades > TAIL ROTOR BLADE DEBONDING. REMOVED AND REPLACED. - [SDR 97ZZZX1352](https://openairdocs.org/sdr/97ZZZX1352.md): Control · smokes · Dec 12, 1996 · N170MC · Bolkms BK117B1 · Flight Compartment Lighting > LIGHT CONTROL UNIT SMOKES WHEN TURNED ON. CIRCUIT BREAKER TRIPS. - [SDR 97ZZZX1351](https://openairdocs.org/sdr/97ZZZX1351.md): Pump · intermittent · Dec 12, 1996 · N170MC · Bolkms BK117B1 · Fuel Boost Pump > PUMP INTERMITTENT WHEN A/C RUNNING. ZERO TIME SINCE OVERHAUL. - [SDR 96ZZZX5705](https://openairdocs.org/sdr/96ZZZX5705.md): Control Unit · malfunction · Aug 9, 1996 · N170MC · Bolkms BK117B1 · Flight Compartment Lighting > LIGHTS WILL NOT TURN 'ON'. NO OUTPUT VOLTAGE. INSTALLED ONLY 4.5 HRS BEFORE FAILURE. LOOSE PARTS INSIDE UNIT. - [SDR 98ZZZX584](https://openairdocs.org/sdr/98ZZZX584.md): Manifold · leaks · Apr 28, 1996 · N170MC · Bolkms BK117B1 · Engine Fuel Distribution > SUBMITTER STATES EXCESSIVE FUEL MANIFOLD LEAKS OVER THE LAST 18 MONTHS. ALLIED SIGNAL IS IN THE PROCESS OF RELEASING AN ASB LIMITING THE LIFE OF THE FUEL MANIFOLD TUBES. OTHER OPERATORS SUBMITTER CONTACTED ARE HAVING THE SAME PROBLEMS. OMNIFLIGHT HAS GONE T - [SDR 96ZZZX3180](https://openairdocs.org/sdr/96ZZZX3180.md): Transceiver · pot missing · Apr 16, 1996 · N170MC · Bolkms BK117B1 · VHF Communications System > RECEIVED THIS UNIT WITH SIDE TONE ADJ. POT MISSING FROM AUDIO BOARD. INSTALLED AUDIO SIDE TONE MISSING POT, BENCH ALIGN AND CHECK. REMOVED AND REPLACED. - [SDR 96ZZZX3179](https://openairdocs.org/sdr/96ZZZX3179.md): Transceiver · defective · Feb 14, 1996 · N170MC · Bolkms BK117B1 · VHF Communications System > ON INSTALLATION IN A/C, CONTROL HEAD GUARD INDICATOR LIGHT ILLUMINATED AND STAYED LIT EVEN WITH NO GUARD MODULE INSTALLED. REMOVED AND REPLACED. - [SDR 95ZZZX6493](https://openairdocs.org/sdr/95ZZZX6493.md): Indicator · fluctuates · Oct 4, 1995 · N170MC · Bolkms BK117B1 · Engine RPM Indicating System > NR 1 N2 NEEDLE FLUCTUATES WHILE ENGINE IS AT 100 PERCENT. NEEDLE FLUCTUATES FROM 70 PERCENT - 25 PERCENT INTERMITTENTLY. LAST REPAIR WAS ALSO FLUCTUATES, STILL DOING THE SAME THING. ## 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 n_number = 'N170MC' AND registry_match = 'registration' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/aircraft/N170MC/reports --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.