# N424MB: 1986 Messerschmitt-Bolkow-Blohm BK 117 A-4, registration cancelled 2013-12-27 - Type: Cancelled registration (FAA registry, deregistered aircraft) - Cancelled: December 27, 2013 - Exported to: Colombia - Status when cancelled: Valid registration - Airframe: [Messerschmitt-Bolkow-Blohm BK 117 A-4](https://openairdocs.org/model/messerschmitt-bolkow-blohm-bk-117-a-4) (registry code 5626017) - Engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999) - Data sheets: [TCDS H13EU](https://openairdocs.org/tcds/H13EU) (OpenAirDocs) - Serial number: 7082 - Year built: 1986 - Type of aircraft: Rotorcraft - Airworthiness: Standard, transport - Airworthiness date: July 26, 2001 - Certificate issued: December 11, 2001 - Last registry action: January 11, 2013 - Mode S code: A50B90 - Owner when cancelled: [Rocky Mountain Holdings LLC](https://openairdocs.org/faa-owner/ROCKY%20MOUNTAIN%20HOLDINGS%20LLC) - Location: [Englewood, CO](https://openairdocs.org/faa-place/CO/Englewood) - Owner type: Corporation - Owner's area on the map: 39.5732° N, 104.8649° W: Placed by OpenAirDocs at the center of ZIP code 80112, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft was based - The mark today: https://openairdocs.org/aircraft/N424MB - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=424MB - Page: https://openairdocs.org/deregistered/N424MB-2013-12-27 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 Messerschmitt-Bolkow-Blohm BK 117 A-4: https://openairdocs.org/model/messerschmitt-bolkow-blohm-bk-117-a-4.md ## Service difficulty reports (26) Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. - [SDR QMLA2011093011097](https://openairdocs.org/sdr/QMLA2011093011097), Sep 30, 2011: ENGINE. POWER LOSS. THE PILOT REPORTED, AFTER PREFLIGHT AND CONFIRMATION CHECKS WERE CONDUCTED, LIFTED TO HOVER. USED THE ENGINE BEEP SWITCH TO SLIGHTLY INCREASE THE NR/N2 RPM TO 1 - [SDR R7M2002F00017](https://openairdocs.org/sdr/R7M2002F00017), Mar 23, 2002: BATTERY. DISCHARGED. LEAD ACID BATTERY WILL NOT HOLD A CHARGE. STAYS AT 20 VOLTS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2001F00507](https://openairdocs.org/sdr/2001F00507), Jul 19, 2001: TORQUEMETER. ERRATIC. TORQUEMETER INDICATOR INOPERATIVE. NR 1 NEEDLE JUMPS ERRATICALLY. RECEIVED NEW WITH A3 AND A4 CONVERSION KIT. THIS UNIT IS BRAND NEW MANUFACTURE, NOT OVERHAULED - [SDR 20000817SH001](https://openairdocs.org/sdr/20000817SH001), Aug 18, 1999: THERMOCOUPLE. SHORTED. INTERNAL SHORT. REPLACED THERMOCOUPLE WITH NEW UNIT, CORRECTED PROBLEM. (X) - [SDR 2000ZZZX775](https://openairdocs.org/sdr/2000ZZZX775), Aug 6, 1999: SEAL. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX774](https://openairdocs.org/sdr/2000ZZZX774), Aug 6, 1999: TUBE. LEAKING. TUBE LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX773](https://openairdocs.org/sdr/2000ZZZX773), Aug 6, 1999: TUBE. LEAKING. TUBE LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX772](https://openairdocs.org/sdr/2000ZZZX772), Aug 6, 1999: BLADE. DAMAGED. EXCESSIVE GP BLADE TIP RUB. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX771](https://openairdocs.org/sdr/2000ZZZX771), Aug 6, 1999: SPRING. WORN. SPRING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX770](https://openairdocs.org/sdr/2000ZZZX770), Aug 6, 1999: SEAL. WORN. SEAL RING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTIVE PROBLEM. - [SDR 99ZZZX892](https://openairdocs.org/sdr/99ZZZX892), Nov 5, 1998: BEARING. WORN. BEARING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 98ZZZX1797](https://openairdocs.org/sdr/98ZZZX1797), Mar 10, 1998: BEARING. WORN. BEARING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 98ZZZX1151](https://openairdocs.org/sdr/98ZZZX1151), Jul 24, 1997: SEAL. LEAKED. LEFT ENGINE NR 2 BEARING SEAL, UPON INSTALLATION, UNIT LEAKED BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 97ZZZX5065](https://openairdocs.org/sdr/97ZZZX5065), Jul 10, 1997: SPEED PICKUP. FAILED. SPEED PICKUP UNIT FAILED TO TEST UPON INSTALLATION. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 96ZZZX5672](https://openairdocs.org/sdr/96ZZZX5672), May 16, 1996: BELLOWS. TORN. BELLOWS IS TORN AROUND CLAMP AND FOLD AREAS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 95ZZZX5381](https://openairdocs.org/sdr/95ZZZX5381), Aug 17, 1995: ROTOR ASSY. BLADE SHIFT. FAILED SB LT101-72-10-0153. EXCESSIVE IBPT BLADE SHIFT. REPLACED WITH USED UNIT, CORRECTED PROBLEM. PART TOTAL CYCLES, 3788.0. - [SDR 96ZZZX1666](https://openairdocs.org/sdr/96ZZZX1666), Jun 23, 1995: BOLT. WORN. BOLT WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 96ZZZX1665](https://openairdocs.org/sdr/96ZZZX1665), Jun 6, 1995: BUSHING. WORN. TEFLON LINERS WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH 8 EACH NEW UNITS, CORRECTED PROBLEM. - [SDR 95ZZZX5271](https://openairdocs.org/sdr/95ZZZX5271), May 19, 1995: SEAL. LEAKING. NR 2 BEARING SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT(S) CORRECTED PROBLEM. - [SDR 95ZZZX5270](https://openairdocs.org/sdr/95ZZZX5270), May 19, 1995: SEAL. LEAKING. NR 3 BEARING SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNITS(S) CORRECTED PROBLEM. - [SDR 95ZZZY0990](https://openairdocs.org/sdr/95ZZZY0990), May 10, 1995: TRANSDUCER. MALFUNCTION. OIL PRESSURE FLUCTUATION. REPLACED WITH NEW UNIT(S), CORRECTED PROBLEM. - [SDR 95ZZZY0967](https://openairdocs.org/sdr/95ZZZY0967), May 10, 1995: RELAY. SHORTED. SUSPECT RELAY HAS INTERNAL SHORT, UPON INSTALLATION UNIT POPS CIRCUIT BREAKER. REPLACED WITH NEW UNIT(S), CORRECTED PROBLEM. - [SDR 96ZZZX506](https://openairdocs.org/sdr/96ZZZX506), Mar 12, 1995: SEAL. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. ENGINE TOTAL CYCLES, 7,314.4. - [SDR 96ZZZX505](https://openairdocs.org/sdr/96ZZZX505), Mar 12, 1995: BEARING. WORN. BEARING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. ENGINE TOTAL CYCLES, 7,314.4 - [SDR 95ZZZX5561](https://openairdocs.org/sdr/95ZZZX5561), Mar 12, 1995: ROTARY ASSY. DISC DAMAGE. DISC HAS EXCESSIVE DAMAGE (WARPED CAUSING LOOSE BLADES) RESULTING FROM LAB SEAL ELEMENT RUBBING INTO DISC KNIFE EDGES. THIS LAB SEAL HAS FEWER WELD POINTS AS CO - [SDR 95ZZZX5378](https://openairdocs.org/sdr/95ZZZX5378), Mar 12, 1995: ROTOR ASSY. BLADE SHIFT. FAILED SB LT101-72-10-0153. EXCESSIVE IBPT BLADE SHIFT NR 7, PLUS 0.008 INCH, NR 10, PLUS 0.008 INCH. REPLACED WITH USED UNIT, CORRECTED PROBLEM. PART TOTAL CYC ## 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 19900329012639I](https://openairdocs.org/incident/19900329012639I), Mar 29, 1990: Bolkms BK117A3 (N424MB), Pittsburg, PA, Minor damage. Pilot felt jolt en route. Returned and landed. NR1 engine cowling missing. Latch assembly showed abnormal wear. --- 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.