# N911BY: Messerschmitt-Bolkow-Blohm BK 117 A-4, registration cancelled 2013-07-15 - Type: Cancelled registration (FAA registry, deregistered aircraft) - Cancelled: July 15, 2013 - Status when cancelled: Registration expired, pending cancellation - Airframe: [Messerschmitt-Bolkow-Blohm BK 117 A-4](https://openairdocs.org/model/messerschmitt-bolkow-blohm-bk-117-a-4) (registry code 5626017) - Data sheets: [TCDS H13EU](https://openairdocs.org/tcds/H13EU) (OpenAirDocs) - Serial number: 7127 - Type of aircraft: Rotorcraft - Certificate issued: June 9, 1999 - Last registry action: April 15, 2008 - Mode S code: AC9A92 - 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/N911BY - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=911BY - Page: https://openairdocs.org/deregistered/N911BY-2013-07-15 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 (87, newest 50) Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. - [SDR QML2008F00013](https://openairdocs.org/sdr/QML2008F00013), Sep 13, 2008: COMPUTER. FAULTED. WHILE RETURNING TO BASE, CREW NOTICED AN INCREASING STRONG ELECTRICAL ODOR AS THE ACFT TURNED FINAL. CONTINUED TO THE LANDING AREA AND PUT THE ACFT OUT OF SERVI - [SDR R7MA33788](https://openairdocs.org/sdr/R7MA33788), Nov 17, 2001: SHROUD. WORN. EXCESSIVE GP BLADE TIP RUB. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR R7MA33789](https://openairdocs.org/sdr/R7MA33789), Nov 17, 2000: NOZZLE. CRACKED. CRACKED BEYOND SERVICEABLE (NOT REPAIRABLE) LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR R7MR33010](https://openairdocs.org/sdr/R7MR33010), Aug 25, 2000: BEARING. DAMAGED. EXCESSIVE PITTING. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR R7MR33005](https://openairdocs.org/sdr/R7MR33005), Aug 25, 2000: HARNESS. SHORTED. INTERNAL SHORT. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR R7MR32996](https://openairdocs.org/sdr/R7MR32996), Aug 25, 2000: SEAL. WARPED. EXCESSIVE WARPAGE. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR R7MR32995](https://openairdocs.org/sdr/R7MR32995), Aug 25, 2000: SHROUD. DAMAGED. EXCESSIVE GP BLADE TIP RUB. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR R7MR32990](https://openairdocs.org/sdr/R7MR32990), Aug 25, 2000: SPRING. WORN. WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNITS, CORRECTED PROBLEM. - [SDR R7MR32989](https://openairdocs.org/sdr/R7MR32989), Aug 25, 2000: SEAL RING. WORN. WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNITS, CORRECTED PROBLEM. - [SDR 20001018SH015](https://openairdocs.org/sdr/20001018SH015), Jul 27, 2000: LIGHT. WORN. CLEAR TAIL LIGHT WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (X) - [SDR 20000607SH012](https://openairdocs.org/sdr/20000607SH012), Mar 31, 2000: BEARING. WORN. BEARING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH2 EACH NEW UNITS, CORRECTED PROBLEM. (X) - [SDR 20000919SH012](https://openairdocs.org/sdr/20000919SH012), Feb 29, 2000: SEAL. LEAKING. LEAKING BYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (X) - [SDR 20000919SH011](https://openairdocs.org/sdr/20000919SH011), Feb 29, 2000: SEAL. LEAKING. LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (X) - [SDR 20000919SH010](https://openairdocs.org/sdr/20000919SH010), Feb 29, 2000: CURL. BURNED. EXCESSIVE BURN IN SOME AREAS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (X) - [SDR 20000919SH009](https://openairdocs.org/sdr/20000919SH009), Feb 29, 2000: SHROUD. DAMAGED. EXCESSIVE GP BLADE TIP RUB. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (X) - [SDR 20000919SH008](https://openairdocs.org/sdr/20000919SH008), Feb 29, 2000: DIFFUSER. CRACKED. DIFFUSER ASSY CRACKED BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (X) - [SDR 20000919SH007](https://openairdocs.org/sdr/20000919SH007), Feb 29, 2000: SEAL. WORN. WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (X) - [SDR 20000919SH006](https://openairdocs.org/sdr/20000919SH006), Feb 29, 2000: SEAL. WORN. SEAL WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (X) - [SDR 20000919SH004](https://openairdocs.org/sdr/20000919SH004), Feb 29, 2000: SEAL. LEAKING. LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (X) - [SDR 20000508SH035](https://openairdocs.org/sdr/20000508SH035), Jul 15, 1999: SEAL. WORN. SEAL RING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (X) - [SDR 20000508SH034](https://openairdocs.org/sdr/20000508SH034), Jul 15, 1999: BLADE. WORN. EXCESSIVE GP BLADE TIP RUB. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (X) - [SDR 20000508SH033](https://openairdocs.org/sdr/20000508SH033), Jul 15, 1999: SEAL. MELTED. SEAL, NR 3 BEARING, LEAKING BEYOND SERVICE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (X) - [SDR 20000508SH032](https://openairdocs.org/sdr/20000508SH032), Jul 15, 1999: SEAL. LEAKING. SEAL, NR 2 BEARING, LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (X) - [SDR 99ZZZX3863](https://openairdocs.org/sdr/99ZZZX3863), May 28, 1999: GUIDE. WORN. WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 99ZZZX3862](https://openairdocs.org/sdr/99ZZZX3862), May 28, 1999: CATCHER. WORN. CATCHER WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 99ZZZX3861](https://openairdocs.org/sdr/99ZZZX3861), May 28, 1999: CATCHER. WORN. CATCHER WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX769](https://openairdocs.org/sdr/2000ZZZX769), May 19, 1999: MANIFOLD. MALFUNCTIONED. IMPROPER NOZZLE SPRAY PATTERN. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX756](https://openairdocs.org/sdr/2000ZZZX756), May 19, 1999: SHROUD. DAMAGED. SHROUD HAD EXCESSIVE GP BLADE TIP RUB. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX755](https://openairdocs.org/sdr/2000ZZZX755), May 19, 1999: SEAL. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 99ZZZX3864](https://openairdocs.org/sdr/99ZZZX3864), May 7, 1999: BEARING. WORN. BEARING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 99ZZZX4072](https://openairdocs.org/sdr/99ZZZX4072), Apr 6, 1999: LEAD. WORN. LEAD WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 99ZZZX3884](https://openairdocs.org/sdr/99ZZZX3884), Mar 19, 1999: BEARING. WORN. BEARING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 99ZZZX3883](https://openairdocs.org/sdr/99ZZZX3883), Jan 8, 1999: BEARING. WORN. BEARING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 99ZZZX853](https://openairdocs.org/sdr/99ZZZX853), Oct 22, 1998: BEARING. WORN. BEARING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 98ZZZX4113](https://openairdocs.org/sdr/98ZZZX4113), Sep 8, 1998: ROTOR ASSY. DAMAGED. FAILED SB LT101-72-10-0153 (Q-ROTOR INSPECTION). EXCESSIVE IBPT BLADE SHIFT. REPLACED WITH USED UNIT, CORRECTED PROBLEM. PART TC: 3,518.5. - [SDR 99ZZZX691](https://openairdocs.org/sdr/99ZZZX691), Aug 18, 1998: EXCITER. FAILED. EXCITER INOPERATIVE. IGNITERS WILL NOT SPARK (NOT VERY EXCITABLE). REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 99ZZZX1699](https://openairdocs.org/sdr/99ZZZX1699), May 12, 1998: SEAL. WORN. SEAL WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. PART TC: 6,926.0. - [SDR 98ZZZX3741](https://openairdocs.org/sdr/98ZZZX3741), May 12, 1998: SEAL. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 98ZZZX3740](https://openairdocs.org/sdr/98ZZZX3740), May 12, 1998: BEARING. CORRODED. BEARING HAS EXCESSIVE PITTING. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 98ZZZX3739](https://openairdocs.org/sdr/98ZZZX3739), May 12, 1998: SEAL. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 98ZZZX3720](https://openairdocs.org/sdr/98ZZZX3720), May 12, 1998: SHAFT. CORRODED. SHAFT HAS EXCESSIVE PITTING. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. PART TOTAL CYCLES: 1,661.3. - [SDR 98ZZZX3718](https://openairdocs.org/sdr/98ZZZX3718), May 12, 1998: TUBE ASSY. LEAKING. TUBE ASSY LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 98ZZZX3717](https://openairdocs.org/sdr/98ZZZX3717), May 12, 1998: BEARING. CORRODED. BEARING HAS EXCESSIVE PITTING. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 98ZZZX3716](https://openairdocs.org/sdr/98ZZZX3716), May 12, 1998: NOZZLE ASSY. MALFUNCTIONED. UNABLE TO GET CORRECT FLOW WHICH RESULTED IN ENGINE LOW POWER WITH HIGH EGT. -08 WEFA NEEDS TO BE BETWEEN 3.592 AND 3.600. WEFA FOR DISCREPANT UNIT IS 3.692 WHI - [SDR 98ZZZX3372](https://openairdocs.org/sdr/98ZZZX3372), May 12, 1998: ROTOR ASSY. FAILED. FAILED SB LT101-72-10-0153. EXCESSIVE IBPT BLADE SHIFT. REPLACED WITH USED UNIT, CORRECTED PROBLEM. PART TOTAL CYCLES: 4,571.4. - [SDR 98ZZZX1809](https://openairdocs.org/sdr/98ZZZX1809), Jan 27, 1998: BEARING. WORN. BEARING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH 2 EACH NEW UNITS, CORRECTED PROBLEM. - [SDR 98ZZZX1358](https://openairdocs.org/sdr/98ZZZX1358), Jan 27, 1998: BLADE. DEFECTIVE. T/R BLADE PAINT BEGINNING TO PEEL. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 98ZZZX1357](https://openairdocs.org/sdr/98ZZZX1357), Jan 27, 1998: BLADE. DEFECTIVE. T/R BLADE PAINT BEGINNING TO PEEL. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 98ZZZX1808](https://openairdocs.org/sdr/98ZZZX1808), Nov 6, 1997: BEARING. WORN. BEARING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH 2 EACH NEW UNITS, CORRECTED PROBLEM. - [SDR 97ZZZX4658](https://openairdocs.org/sdr/97ZZZX4658), Jul 15, 1997: BLADE. CRACKED. M/R BLADE FAILED BLADE INSPECTION. EXCESSIVE SKIN BULGING AND CRACKS. All 87: https://openairdocs.org/deregistered/N911BY-2013-07-15/reports.md ## Other aircraft with N911BY - [Registered now](https://openairdocs.org/aircraft/N911BY): MD Helicopters 369E, S/N 0617E, built 2013 --- 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.