# N170MC: 1990 Messerschmitt-Bolkow-Blohm BK 117 B-2

- Status: Valid registration
- Airframe: [Messerschmitt-Bolkow-Blohm BK 117 B-2](https://openairdocs.org/model/messerschmitt-bolkow-blohm-bk-117-b-2) (registry code 5626013, 7 seats)
- Engine: [Lycoming LTS-101 series](https://openairdocs.org/engine/lycoming-lts-101-series) (registry code 41560)
- Data sheets: [TCDS H13EU](https://openairdocs.org/tcds/H13EU) (Airbus Helicopters Deutschland GmbH (AHD)), [TCDS E5NE](https://openairdocs.org/tcds/E5NE) (Intermountain Turbine Services Inc.) (OpenAirDocs)
- Serial number: 7217
- Year built: 1990
- Type: Rotorcraft
- Engine type: Turbo-shaft
- Airworthiness: Standard, transport
- Airworthiness date: November 26, 2019
- Certificate issued: April 13, 2020
- Expires: April 30, 2030
- Mode S code: A11A43
- Registered owner: [5-State Helicopters Inc](https://openairdocs.org/faa-owner/5-STATE%20HELICOPTERS%20INC)
- Location: [Fate, TX](https://openairdocs.org/faa-place/TX/Fate)
- Owner type: Corporation
- Owner's area on the map: 32.9455° N, 96.3111° W: Placed by OpenAirDocs at the center of ZIP code 75189, within about 6 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=170MC
- Page: https://openairdocs.org/aircraft/N170MC

From the FAA registry file of October 24, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination. The registry lists only the engine series, so ADs for every Lycoming LTS-101 model are included.

## ADs that may apply (OpenAirDocs): 24 in force

### Matched by airframe (Messerschmitt-Bolkow-Blohm BK 117 B-2)

None in force.

### Matched by engine (Lycoming LTS-101 series)

- [AD 2011-23-13](https://openairdocs.org/ad/2011-23-13): Power turbine governors (PTG) · Honeywell International LTS101-600A-2, LTS101-600A-3, LTS101-600A-3A and 1 more. Effective Nov 29, 2011
- [AD 2011-08-06](https://openairdocs.org/ad/2011-08-06): Power turbine rotors · Honeywell International LTP 101-600A-1A, LTP 101-700A-1A, LTS101-600A-2 and 10 more. Effective May 17, 2011
- [AD 2009-24-12](https://openairdocs.org/ad/2009-24-12): Gas generator · Honeywell International LTP 101-600A-1A, LTP 101-700A-1A, LTS101-600A-2 and 12 more. Effective Jan 4, 2010
- [AD 2002-03-09 R1](https://openairdocs.org/ad/2002-03-09-R1): Impellers · Honeywell International LTP 101-600, LTP 101-600A, LTP 101-600A-1A and 14 more. Effective Mar 27, 2002
- [AD 2001-25-04](https://openairdocs.org/ad/2001-25-04): Fuel Controls · Honeywell International LTP 101-600A-1A, LTP 101-700A-1A, LTS101-600A-2 and 1 more. Effective Jan 23, 2002
- [AD 2001-22-07](https://openairdocs.org/ad/2001-22-07): Rigid Tube Fuel Manifold Assemblies · Honeywell International LTP 101-600, LTP 101-600A, LTP 101-600A-1A and 14 more. Effective Nov 30, 2001
- [AD 2001-17-15](https://openairdocs.org/ad/2001-17-15): Engine Fuel Pumps · Honeywell International LTP 101-600A-1A, LTP 101-700A-1A, LTS101-600A-2 and 2 more. Effective Oct 1, 2001
- [AD 96-12-27](https://openairdocs.org/ad/96-12-27): Gas Generator Turbine Disk · Honeywell International LTP 101-600, LTP 101-600A, LTP 101-600A-1A and 21 more. Effective Aug 19, 1996
- [AD 96-12-05](https://openairdocs.org/ad/96-12-05): Turbine rotors · Honeywell International LTP 101-600, LTP 101-600A, LTP 101-600A-1A and 14 more. Effective Aug 12, 1996
- [AD 96-10-04](https://openairdocs.org/ad/96-10-04): Fuel control · Honeywell International LTS101-600A-2 and LTS101-600A-3. Effective Jun 13, 1996
- [AD 96-06-10](https://openairdocs.org/ad/96-06-10): Power turbine (PT) disk · Honeywell International LTS101-600A-2, LTS101-600A-3 and LTS101-750B-2. Effective May 28, 1996
- [AD 95-26-01](https://openairdocs.org/ad/95-26-01): Power Turbine · Honeywell International LTS101-650B-1, LTS101-650C, LTS101-750B-1 and 1 more. Effective Apr 22, 1996
- [AD 95-16-04](https://openairdocs.org/ad/95-16-04): Axial Compressor Rotors · Honeywell International LTP 101-600, LTP 101-600A, LTP 101-600A-1A and 21 more. Effective Oct 2, 1995
- [AD 95-08-14](https://openairdocs.org/ad/95-08-14): Electronic Overspeed Protection System · Honeywell International LTS101-650B-1, LTS101-650C-3, LTS101-650C-3A and 2 more. Effective May 9, 1995
- [AD 94-18-06](https://openairdocs.org/ad/94-18-06): Bearings · Honeywell International LTP 101-600, LTP 101-600A, LTP 101-600A-1A and 21 more. Effective Sep 26, 1994
- [AD 93-13-11](https://openairdocs.org/ad/93-13-11): Gas Generator Turbine Rotor Disk · Honeywell International LTP 101-600, LTP 101-600A, LTP 101-600A-1A and 22 more. Effective Nov 8, 1993
- [AD 92-15-07](https://openairdocs.org/ad/92-15-07): Integrally Cast Power Turbine (PT) Rotor Blade · Honeywell International LTP 101-600, LTP 101-600A, LTP 101-600A-1A and 21 more. Effective Sep 2, 1992
- [AD 88-14-01](https://openairdocs.org/ad/88-14-01): Power Turbine Disk · Honeywell International LTS101-600A, LTS101-600A-1, LTS101-600A-2 and 17 more. Effective Jul 6, 1988
- [AD 86-10-04](https://openairdocs.org/ad/86-10-04): Gas Producer (G.P.) Blade · Honeywell International LTP 101-600A-1A, LTP 101-700A-1A, LTS101-600A-2 and 11 more. Effective May 16, 1986
- [AD 84-02-07](https://openairdocs.org/ad/84-02-07): Output Gear Assembly and Torquemeter Gear Assembly · Honeywell International LTS101-600A-2. Effective May 7, 1984
- [AD 83-16-03](https://openairdocs.org/ad/83-16-03): Install Overspeed Limiter · Honeywell International LTS101-600A-2. Effective Aug 25, 1983
- [AD 79-06-06 R2](https://openairdocs.org/ad/79-06-06-R2): Lubrication System Contamination · Honeywell International LTP 101-600, LTP 101-600A, LTS101-600A and 3 more. Effective Jun 2, 1980
- [AD 79-20-03](https://openairdocs.org/ad/79-20-03): Fuel Control, Fuel Pump And Oil Pump Drive Gears · Honeywell International LTP 101-600, LTP 101-600A, LTP 101-600A-1A and 5 more. Effective Sep 26, 1979
- [AD 84-14-01](https://openairdocs.org/ad/84-14-01): T4 Indicator System Check · Honeywell International LTS101-600A-2

### Historical (superseded or no longer in force)

- [AD 95-09-02](https://openairdocs.org/ad/95-09-02) (historical): Fuel Pumps · Honeywell International LTP 101-600, LTP 101-600A, LTP 101-600A-1A and 12 more. Effective May 10, 1995

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N170MC.

## FAA accident and incident reports

None matched to N170MC.

## Service difficulty reports (18)

As reported by operators and repair stations. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

- [SDR QMLA2013092013136](https://openairdocs.org/sdr/QMLA2013092013136), Sep 20, 2013: DOUBLER. CRACKED. 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,
- [SDR 2011FA0000618](https://openairdocs.org/sdr/2011FA0000618), Sep 21, 2011: INDICATOR. DAMAGED. 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 WAR
- [SDR RMXA022220107217](https://openairdocs.org/sdr/RMXA022220107217), Feb 22, 2010: GUIDE. WORN. 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 CONTINUE
- [SDR RMXA080420097217](https://openairdocs.org/sdr/RMXA080420097217), Aug 4, 2009: SKIN. CRACKED. 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. CR
- [SDR RMXA062620097217](https://openairdocs.org/sdr/RMXA062620097217), Jun 26, 2009: BLADE. DEBONDED. 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 SE
- [SDR 7217071607](https://openairdocs.org/sdr/7217071607), Jul 16, 2007: DRIVE SHAFT. DAMAGED. 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
- [SDR 20000413SH028](https://openairdocs.org/sdr/20000413SH028), Jan 31, 2000: GYRO. FAILED. 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), Jan 24, 2000: BLADE. DEBONDED. 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), Aug 26, 1998: INDICATOR. MALFUNCTIONED. TACHOMETER'S NR 1 AND NR 2 NEEDLE SPLIT 2 PERCENT. REMOVED AND REPLACED.
- [SDR 98ZZZX2080](https://openairdocs.org/sdr/98ZZZX2080), May 15, 1998: PICKUP. FAILED. NG PICKUP INOPERATIVE. REPLACED NG PICKUP.
- [SDR 98ZZZX1516](https://openairdocs.org/sdr/98ZZZX1516), Jan 11, 1998: BLADE. DEBONDED. TAIL ROTOR BLADE DEBONDING. REMOVED AND REPLACED.
- [SDR 97ZZZX1352](https://openairdocs.org/sdr/97ZZZX1352), Dec 12, 1996: CONTROL. SMOKES. LIGHT CONTROL UNIT SMOKES WHEN TURNED ON. CIRCUIT BREAKER TRIPS.
- [SDR 97ZZZX1351](https://openairdocs.org/sdr/97ZZZX1351), Dec 12, 1996: PUMP. INTERMITTENT. PUMP INTERMITTENT WHEN A/C RUNNING. ZERO TIME SINCE OVERHAUL.
- [SDR 96ZZZX5705](https://openairdocs.org/sdr/96ZZZX5705), Aug 9, 1996: CONTROL UNIT. MALFUNCTION. 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), Apr 28, 1996: MANIFOLD. LEAKS. 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 MANIFO
- [SDR 96ZZZX3180](https://openairdocs.org/sdr/96ZZZX3180), Apr 16, 1996: TRANSCEIVER. POT MISSING. 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), Feb 14, 1996: TRANSCEIVER. DEFECTIVE. 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), Oct 4, 1995: INDICATOR. FLUCTUATES. 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 

## STCs that may be installed (OpenAirDocs) (1)

Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do.

### Approved for the engine (Lycoming LTS-101 series)

- [STC SE934GL](https://openairdocs.org/stc/SE934GL): Installation of a fuel flow tranducer. Shadin Avionics. Lists LTS101-650B-1

## Related

- Other Messerschmitt-Bolkow-Blohm BK 117 B-2 aircraft: https://openairdocs.org/model/messerschmitt-bolkow-blohm-bk-117-b-2/aircraft.md
- The Lycoming LTS-101 series engine: https://openairdocs.org/engine/lycoming-lts-101-series.md

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