# N420MB: MBB BK 117 A-3, registration cancelled 2018-04-09 - Type: Cancelled registration (FAA registry, deregistered aircraft) - Cancelled: April 9, 2018 - Exported to: Canada - Status when cancelled: Sale reported - Airframe: [MBB BK 117 A-3](https://openairdocs.org/model/mbb-bk-117-a-3) (registry code 5626015) - 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), [TCDS E5NE](https://openairdocs.org/tcds/E5NE) (OpenAirDocs) - Serial number: 7077 - Type of aircraft: Rotorcraft - Engine type: Turbo-shaft - Airworthiness: Standard, transport - Airworthiness date: August 26, 1986 - Last registry action: April 9, 2018 - Mode S code: A4FCB4 - Location: [None, OK](https://openairdocs.org/faa-place/OK/None) - Owner type: Individual - The mark today: https://openairdocs.org/aircraft/N420MB - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=420MB - Page: https://openairdocs.org/deregistered/N420MB-2018-04-09 From the FAA registry file of October 29, 2026, cancelled registrations. Owners' street addresses are left out. The Mode S code belongs to the N-number, not the airframe. ADs and bulletins for the MBB BK 117 A-3: https://openairdocs.org/model/mbb-bk-117-a-3.md ## Service difficulty reports (47) Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. - [SDR QMLA2014022314018](https://openairdocs.org/sdr/QMLA2014022314018), Feb 23, 2014: DOOR. MISSING. 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 & IN - [SDR QMLA2011111611109](https://openairdocs.org/sdr/QMLA2011111611109), Nov 16, 2011: SPAR. CRACKED. DURING INSPECTION, FOUND A CRACK IN THE TAILBOOM VERTICAL FIN MAIN SPAR. OPEN. - [SDR QMLA2011081711087](https://openairdocs.org/sdr/QMLA2011081711087), Aug 17, 2011: FRAME. CRACKED. THE MECHANIC FOUND A CRACK IN THE TAILBOOM AT FRAME 10L, DURING A SCHEDULED INSP. - [SDR QMLA2011012911017](https://openairdocs.org/sdr/QMLA2011012911017), Jan 29, 2011: CHIP DETECTOR. CONTAMINATED. 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 W - [SDR R7MR707735204](https://openairdocs.org/sdr/R7MR707735204), Jun 6, 2002: ANTENNA. INOPERATIVE. WEATHER RADAR ANTENNA INOPERATIVE, HEADING ERROR MESSAGE. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR R7M2002F00016](https://openairdocs.org/sdr/R7M2002F00016), Sep 28, 2001: SEAL. LEAKING. NUMBER 2 BEARING SEAL IS LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT CORRECTED PROBLEM. - [SDR R7M2002F00015](https://openairdocs.org/sdr/R7M2002F00015), Sep 28, 2001: THERMOCOUPLE. SHORTED. THERMOCOUPLE HAS AN INTERNAL SHORT. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR R7MA707732458](https://openairdocs.org/sdr/R7MA707732458), Sep 20, 2000: BELLOWS. TORN. BELLOWS WAS TORN AROUND CLAMP AND FOLD AREAS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 20001017SH017](https://openairdocs.org/sdr/20001017SH017), Jun 22, 2000: COWLING. WORN. CATCHER/CREST COWLING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (X) - [SDR 20001127SH007](https://openairdocs.org/sdr/20001127SH007), Jun 14, 2000: SPRING. WORN. SEAL RING EXPANDER - SPRING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (X) - [SDR 20001127SH006](https://openairdocs.org/sdr/20001127SH006), Jun 14, 2000: SEAL. WORN. FIRST TURBINE SHROUD, SEAL RING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (X) - [SDR 20000721SH005](https://openairdocs.org/sdr/20000721SH005), May 18, 2000: MANIFOLD. MALFUNCTIONED. FUEL MANIFOLD ASSEMBLY CAUSES ENGINE TO RUN HOT. (X) - [SDR 2000ZZZX782](https://openairdocs.org/sdr/2000ZZZX782), Sep 30, 1999: SEAL. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX781](https://openairdocs.org/sdr/2000ZZZX781), Sep 30, 1999: SEAL. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 99ZZZX3790](https://openairdocs.org/sdr/99ZZZX3790), Mar 28, 1999: SHAFT. DAMAGED. SECONDARY DAMAGE TO LAB SEAL FAILURE. REPALCED WITH NEW UNIT, CORRECTED PROBLEM. PART TOTAL CYCLES: 4270. - [SDR 99ZZZX3789](https://openairdocs.org/sdr/99ZZZX3789), Mar 28, 1999: SEAL RING. WORN. SEAL RING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 99ZZZX3788](https://openairdocs.org/sdr/99ZZZX3788), Mar 28, 1999: SPRING. WORN. SPRING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 99ZZZX3787](https://openairdocs.org/sdr/99ZZZX3787), Mar 28, 1999: BEARING. WORN. BEARING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 99ZZZX2330](https://openairdocs.org/sdr/99ZZZX2330), Mar 28, 1999: SHROUD. DAMAGED. SECONDARY DAMAGE TO LAB SEAL FAILURE. EXCESSIVE GROOVES RESULTING FROM GP BLADE DAMAGE. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 99ZZZX2329](https://openairdocs.org/sdr/99ZZZX2329), Mar 28, 1999: BLADE. DAMAGED. SECONDARY DAMAGE TO LAB SEAL FAILURE. EXCESSIVE DAMAGE TO KNIFE EDGES AND GP BLADES. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. PART TOTAL CYCLES: 1,061.9. - [SDR 99ZZZX2328](https://openairdocs.org/sdr/99ZZZX2328), Mar 28, 1999: LABYRINTH SEAL. WARPED. LABYRINTH SEAL HAD EXCESSIVE WARPAGE WHICH RESULTED IN COLLATERAL DAMAGE TO THE GP ROTOR AND SHROUD. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 99ZZZX1802](https://openairdocs.org/sdr/99ZZZX1802), Mar 28, 1999: SEAL ASSY. DAMAGED. EXCESSIVE WARPAGE WHICH RESULTED IN COLLATERAL DAMAGE TO THE GP ROTOR AND SHROUD. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 99ZZZX1801](https://openairdocs.org/sdr/99ZZZX1801), Mar 28, 1999: ROTOR ASSY. DAMAGED. SECONDARY DAMAGE TO LAB SEAL FAILURE. EXCESSIVE DAMAGE TO KNIFE EDGES AND GP BLADES. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. PART TC: 1,061.9. - [SDR 97ZZZX4593](https://openairdocs.org/sdr/97ZZZX4593), Jun 15, 1997: BLADE. CRACKED. FAILED BLADE INSPECTION. EXCESSIVE SKINS CRACKS AND BULGING. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 97ZZZX4592](https://openairdocs.org/sdr/97ZZZX4592), Jun 15, 1997: BLADE. CRACKED. FAILED BLADE INSPECTION. EXCESSIVE SKINS CRACKS AND BULGING. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 97ZZZX67](https://openairdocs.org/sdr/97ZZZX67), Jul 23, 1996: SEAL. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 97ZZZX66](https://openairdocs.org/sdr/97ZZZX66), Jul 23, 1996: SEAL RING. WORN. SEAL RING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH 2 EACH NEW UNITS, CORRECTED PROBLEM. - [SDR 97ZZZX65](https://openairdocs.org/sdr/97ZZZX65), Jul 23, 1996: SEAL. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 97ZZZX64](https://openairdocs.org/sdr/97ZZZX64), Jul 23, 1996: SEAL. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 97ZZZX63](https://openairdocs.org/sdr/97ZZZX63), Jul 23, 1996: SEAL. LEAKING. SEALS LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH 3 EACH NEW UNITS, CORRECTED PROBLEM. - [SDR 97ZZZX62](https://openairdocs.org/sdr/97ZZZX62), Jul 23, 1996: SEAL. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 96ZZZX2810](https://openairdocs.org/sdr/96ZZZX2810), Mar 1, 1996: ROTOR ASSY. BLADE SHIFT. FAILED SB LT101-72-10-0153. EXCESSIVE IBPT BLADE SHIFT NR 25 +0.012 INCH. NR 24 +0.012 INCH. REPLACED WITH USED UNIT, CORRECTED PROBLEM. PART TOTAL CYCLES, 3,60 - [SDR 96ZZZX510](https://openairdocs.org/sdr/96ZZZX510), Nov 3, 1995: GYRO. STUCK. GYRO STUCK. READS 3.42 VOLTS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 96ZZZX509](https://openairdocs.org/sdr/96ZZZX509), Aug 18, 1995: SEAL RING. WORN. SEAL RING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH 2 EACH NEW UNITS, CORRECTED PROBLEM. ENGINE TOTAL CYCLES, 8,721.5. - [SDR 96ZZZX508](https://openairdocs.org/sdr/96ZZZX508), Aug 18, 1995: BEARING. WORN. BEARING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. ENGINE TOTAL CYCLES, 8,721.5. - [SDR 96ZZZX507](https://openairdocs.org/sdr/96ZZZX507), Aug 18, 1995: BEARING. WORN. BEARING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. ENGINE TOTAL CYCLES, 8,721.5. - [SDR 95ZZZX5368](https://openairdocs.org/sdr/95ZZZX5368), Jun 21, 1995: ROTOR ASSY. BLADE SHIFT. FAILED SB LT101-72-10-0153. EXCESSIVE IBPT BLADE SHIFT NR 5, MINUS 0.017 INCH, NR 8, MINUS 0.011 INCH, NR 9, MINUS 0.009 INCH, NR 12, MINUS 0.010 INCH. REPLACED - [SDR 95ZZZX5377](https://openairdocs.org/sdr/95ZZZX5377), May 18, 1995: ROTOR ASSY. BLADE SHIFT. FAILED SB LT101-72-10-0153. EXCESSIVE IBPT BLADE SHIFT NR 5, PLUS 0.012 INCH, NR 26, PLUS 0.009 INCH. REPLACED WITH NEW UNIT(S) CORRECTED PROBLEM. PART TOTAL CY - [SDR 95ZZZX5290](https://openairdocs.org/sdr/95ZZZX5290), May 18, 1995: SEAL. LEAKING. NR 3 BEARING SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT(S) CORRECTED PROBLEM. - [SDR 95ZZZX5289](https://openairdocs.org/sdr/95ZZZX5289), May 18, 1995: SEAL. LEAKING. NR 2 BEARING SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT(S) CORRECTED PROBLEM. - [SDR 95ZZZX5269](https://openairdocs.org/sdr/95ZZZX5269), May 18, 1995: SEAL RING. WORN. FIRST TURBINE SHROUD SEAL RING WORN BEYOND SERVICEABLE LIMITS. - [SDR 95ZZZX5268](https://openairdocs.org/sdr/95ZZZX5268), May 18, 1995: SEAL. LEAKING. ACCESSORY DRIVE SEALS LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH 3 EACH NEW UNIT(S) CORRECTED PROBLEM. - [SDR 95ZZZX5267](https://openairdocs.org/sdr/95ZZZX5267), May 18, 1995: BEARING. ROUGH. ANNULAR BALL BEARING ROUGH. REPLACED WITH 4 EACH NEW UNIT(S) CORRECTED PROBLEM. - [SDR 95ZZZY0999](https://openairdocs.org/sdr/95ZZZY0999), May 10, 1995: BULB. PIN BROKE. ANODE PIN BROKE OFF DURING LAMP REPLACEMENT. XENON TUBE DID NOT BURST. REPLACED WITH NEW UNIT(S), CORRECTED PROBLEM. - [SDR 95ZZZX5376](https://openairdocs.org/sdr/95ZZZX5376), Feb 28, 1995: ROTOR ASSY. BLADE SHIFT. FAILED SB LT101-72-10-0153. EXCESSIVE IBPT BLADE SHIFT NR 7, PLUS 0.011 INCH, NR 12, PLUS 0.018 INCH, NR 17, PLUS 0.010 INCH, NR 18, PLUS 0.010 INCH. REPLACED W - [SDR 95ZZZX5266](https://openairdocs.org/sdr/95ZZZX5266), Feb 28, 1995: SEAL RING. WORN. FIRST TURBINE SEALS WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW 2 EACH UNITS(S) CORRECTED PROBLEM. - [SDR 95ZZZX5501](https://openairdocs.org/sdr/95ZZZX5501), Jan 4, 1995: GYRO. DEFECTIVE. GYRO UNIT REMOVED BECAUSE OF YAW CSAS KICK. REPLACED WITH NEW UNIT(S) CORRECTED PROBLEM. ## FAA accident and incident reports (1) From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [Incident 19910903042529I](https://openairdocs.org/incident/19910903042529I), Sep 3, 1991: Bolkms BK117A3 (N420MB), Louisville, KY, Minor damage. Right engine cowling came off and hit rotor blades after takeoff. Landed in vacant lot. ## Other aircraft with N420MB - [Cancelled 2024-04-03](https://openairdocs.org/deregistered/N420MB-2024-04-03): Airbus A321-211, S/N 0961. Exported to Malta. Owner: [Umb Bank Na Trustee](https://openairdocs.org/faa-owner/UMB%20BANK%20NA%20TRUSTEE), [Salt Lake City, UT](https://openairdocs.org/faa-place/UT/Salt%20Lake%20City) --- 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.