# N528SF: 1986 Eurocopter Deutschland MBB BK-117 A4, registration cancelled 2017-03-10 - Type: Cancelled registration (FAA registry, deregistered aircraft) - Cancelled: March 10, 2017 - Status when cancelled: Registration expired, pending cancellation - Airframe: [Eurocopter Deutschland MBB BK-117 A4](https://openairdocs.org/model/eurocopter-deutschland-mbb-bk-117-a4) (registry code 5626035) - Engine: [Honeywell LTS101-600 SR](https://openairdocs.org/engine/honeywell-lts101-600-sr) (registry code 33904) - Data sheets: [TCDS H13EU](https://openairdocs.org/tcds/H13EU) (OpenAirDocs) - Serial number: 7104 - Year built: 1986 - Type of aircraft: Rotorcraft - Engine type: Turbo-shaft - Airworthiness: Standard, transport - Airworthiness date: November 20, 1986 - Certificate issued: April 19, 2001 - Last registry action: October 19, 2007 - Mode S code: A6A83C - Owner when cancelled: [Rocky Mountain Holdings LLC](https://openairdocs.org/faa-owner/ROCKY%20MOUNTAIN%20HOLDINGS%20LLC) - Location: [Provo, UT](https://openairdocs.org/faa-place/UT/Provo) - Owner type: Corporation - Owner's area on the map: 40.2338° N, 111.6585° W: Placed by OpenAirDocs: center of Provo, UT, within about 4 miles (OpenAirDocs). The owner's mailing address, not where the aircraft was based - The mark today: https://openairdocs.org/aircraft/N528SF - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=528SF - Page: https://openairdocs.org/deregistered/N528SF-2017-03-10 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 Eurocopter Deutschland MBB BK-117 A4: https://openairdocs.org/model/eurocopter-deutschland-mbb-bk-117-a4.md ## Service difficulty reports (48) Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. - [SDR R7MR35340](https://openairdocs.org/sdr/R7MR35340), Jun 3, 2002: TRANSDUCER. INOPERATIVE. PRESSURE TRANSDUCER, UNIT INOPERATIVE. INCORRECT READINGS, 40 PERCENT TOO HIGH (FLUCTUATING). REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR R7M2002F00018](https://openairdocs.org/sdr/R7M2002F00018), Oct 19, 2001: SEAL. LEAKING. NR3 BEARING SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2002F00312](https://openairdocs.org/sdr/2002F00312), Jun 8, 2001: TRANSDUCER. INOPERATIVE. PRESSURE TRANSDUCER INOPERATIVE. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (M) - [SDR 2000ZZZX739](https://openairdocs.org/sdr/2000ZZZX739), Jul 28, 1999: SEAL. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX738](https://openairdocs.org/sdr/2000ZZZX738), Jul 28, 1999: SEAL. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX737](https://openairdocs.org/sdr/2000ZZZX737), Jul 28, 1999: SEAL. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX736](https://openairdocs.org/sdr/2000ZZZX736), Jul 28, 1999: BEARING. CORRODED. BREARING HAS EXCESSIVE PITTING. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX735](https://openairdocs.org/sdr/2000ZZZX735), Jul 28, 1999: SEAL. DAMAGED. LABYRINTH SEAL EXCESSIVELY GROOVED. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX733](https://openairdocs.org/sdr/2000ZZZX733), Jul 28, 1999: SPRING. WORN. SPRING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX732](https://openairdocs.org/sdr/2000ZZZX732), Jul 28, 1999: SEAL. WORN. SEAL RING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX731](https://openairdocs.org/sdr/2000ZZZX731), Jul 28, 1999: VANE. CRACKED. VANE CRACKED BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX730](https://openairdocs.org/sdr/2000ZZZX730), Jul 28, 1999: COVER. WORN. COVER WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX729](https://openairdocs.org/sdr/2000ZZZX729), Jul 28, 1999: HOUSING. WORN. HOUSING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 2000ZZZX734](https://openairdocs.org/sdr/2000ZZZX734), Jul 8, 1999: SHROUD. DAMAGED. EXCESSIVE GP BLADE TIP RUB. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 99ZZZX1799](https://openairdocs.org/sdr/99ZZZX1799), Jun 13, 1998: SHROUD. TIP RUB. EXCESSIVE GP BLADE TIP RUB. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 98ZZZX4112](https://openairdocs.org/sdr/98ZZZX4112), Jun 13, 1998: ROTOR ASSY. DAMAGED. FAILED SB LT101-72-10-0153 (FAILED Q-ROTOR INSPECTION). EXCESSIVE IBPT BLADE SHIFT. REPLACED WITH USED UNIT, CORRECTED PROBLEM. PART TC: 9,744.4. - [SDR 98ZZZX3379](https://openairdocs.org/sdr/98ZZZX3379), May 19, 1998: BEARING. PITTED. BEARING HAS EXCESSIVE PITTING. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 98ZZZX3378](https://openairdocs.org/sdr/98ZZZX3378), May 19, 1998: PICKUP. FAILED. PICKUP HAS EXCESSIVE PITTING. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 98ZZZX3377](https://openairdocs.org/sdr/98ZZZX3377), May 19, 1998: PICKUP. FAILED. PICKUP HAS EXCESSIVE PITTING. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 98ZZZX3376](https://openairdocs.org/sdr/98ZZZX3376), Feb 28, 1998: PICKUP. FAILED. PICKUP REJECTED PER SB 0163 (IMPROPER MARKINGS AND POSSIBLE REVERSE POLARITY). REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 98ZZZX3375](https://openairdocs.org/sdr/98ZZZX3375), Feb 28, 1998: PICKUP. FAILED. PICKUP REJECTED PER SB 0163 (IMPROPER MARKINGS AND POSSIBLE REVERSE POLARITY). REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 98ZZZX3722](https://openairdocs.org/sdr/98ZZZX3722), Dec 19, 1997: SEAL. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 98ZZZX3721](https://openairdocs.org/sdr/98ZZZX3721), Dec 19, 1997: BEARING. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 98ZZZX1359](https://openairdocs.org/sdr/98ZZZX1359), Dec 19, 1997: ROTOR ASSY. DEFECTIVE. TURBINE ROTOR ASSY FAILED SB LT101-72-10-0153. EXCESSIVE IBPT BLADE SHIFT. REPLACED WITH USED UNIT, CORRECTED PROBLEM. PART TC: 3,001. - [SDR 97ZZZX2318](https://openairdocs.org/sdr/97ZZZX2318), Feb 28, 1997: PIN. WORN. SECONDARY BLADE PIN WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 97ZZZX2317](https://openairdocs.org/sdr/97ZZZX2317), Feb 28, 1997: PIN. WORN. SECONDARY BLADE PIN WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 97ZZZX2316](https://openairdocs.org/sdr/97ZZZX2316), Feb 28, 1997: BLADE PIN. WORN. SECONDARY BLADE PIN WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 97ZZZX2136](https://openairdocs.org/sdr/97ZZZX2136), Feb 28, 1997: BLADE PIN. WORN. SECONDARY BLADE PIN WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 97ZZZX637](https://openairdocs.org/sdr/97ZZZX637), Nov 7, 1996: BLADE. CRACKED. M/R BLADE CRACKS AND SKIN BULGING. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 97ZZZX636](https://openairdocs.org/sdr/97ZZZX636), Nov 7, 1996: BLADE. CRACKED. M/R BLADE CRACKS AND SKIN BULGING. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 97ZZZX2743](https://openairdocs.org/sdr/97ZZZX2743), Jul 19, 1996: SEAL. CHIPPED. SEAL NEW OUT-OF-BOX AND CHIPPED BEYOND ALLOWABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 97ZZZX2742](https://openairdocs.org/sdr/97ZZZX2742), Jul 19, 1996: SPRING. WORN. SEAL RING EXPANDER SPRING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH 2 EACH NEW UNITS, CORRECTED PROBLEM. - [SDR 97ZZZX2741](https://openairdocs.org/sdr/97ZZZX2741), Jul 19, 1996: SEAL RING. WORN. SEAL RING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH 2 EACH NEW UNITS, CORRECTED PROBLEM. - [SDR 97ZZZX2740](https://openairdocs.org/sdr/97ZZZX2740), Jul 19, 1996: BEARING. ROUGH. BEARING ROUGH. REPLACED WITH 2 EACH NEW UNITS, CORRECTED PROBLEM. - [SDR 96ZZZX4681](https://openairdocs.org/sdr/96ZZZX4681), Jun 1, 1996: SEAL. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 96ZZZX4680](https://openairdocs.org/sdr/96ZZZX4680), Jun 1, 1996: SEAL. LEAKING. ACCESSORY DRIVE SEALS LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW 3 EACH UNITS, CORRECTED PROBLEM. - [SDR 96ZZZX4679](https://openairdocs.org/sdr/96ZZZX4679), Jun 1, 1996: SEAL. LEAK. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 96ZZZX4678](https://openairdocs.org/sdr/96ZZZX4678), Jun 1, 1996: SEAL. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 96ZZZX4677](https://openairdocs.org/sdr/96ZZZX4677), Jun 1, 1996: SEAL RING. WORN. FIRST TURBINE SHROUD SEAL RING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH 2 EACH, NEW UNITS, CORRECTED PROBLEM. - [SDR 96ZZZX4676](https://openairdocs.org/sdr/96ZZZX4676), Jun 1, 1996: SEAL. LEAKING. SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 96ZZZX4268](https://openairdocs.org/sdr/96ZZZX4268), May 8, 1996: ROTOR ASSY. BLADE SHIFT. FAILED SB LT101-72-10-0153. EXCESSIVE IBPT BLADE SHIFT NR 18 +0.016 INCH. LEAD-THE-FLEET. REPLACED WITH USED UNIT, CORRECTED PROBLEM. PART TOTAL CYCLES, 4,274.1 - [SDR 96ZZZX1565](https://openairdocs.org/sdr/96ZZZX1565), Jan 28, 1996: GYRO. FAILED. GYRO UNABLE TO SPOOL UP. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. - [SDR 95ZZZX5490](https://openairdocs.org/sdr/95ZZZX5490), May 9, 1995: SEAL. LEAKING. NR 2 BEARING SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT(S) CORRECTED PROBLEM. - [SDR 95ZZZX5489](https://openairdocs.org/sdr/95ZZZX5489), May 9, 1995: SEAL. LEAKING. NR 3 BEARING SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT(S) CORRECTED PROBLEM. - [SDR 95ZZZX5366](https://openairdocs.org/sdr/95ZZZX5366), May 9, 1995: ROTOR ASSY. BLADE SHIFT. FAILED SB LT101-72-10-0153. EXCESSIVE IBPT BLADE SHIFT NR 15, MINUS 0.009 INCH. REPLACED WITH NEW UNITS(S) CORRECTED PROBLEM. PART TOTAL CYCLES, 4296.4. - [SDR 95ZZZX5300](https://openairdocs.org/sdr/95ZZZX5300), May 9, 1995: SEAL RING. WORN. FIRST TURBINE SHROUD SEAL RING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH 2 EACH NEW UNIT(S) CORRECTED PROBLEM. - [SDR 95ZZZX5301](https://openairdocs.org/sdr/95ZZZX5301), Apr 15, 1995: BELLOWS. TORN. BELLOWS IS TORN AROUND CLAMP AND FOLD AREAS. REPLACED WITH NEW UNIT(S) CORRECTED PROBLEM. - [SDR 95ZZZX2583](https://openairdocs.org/sdr/95ZZZX2583), Mar 28, 1995: COMPUTER. INOPERATIVE. SPAS COMPUTER UNIT INOPERATIVE. REPLACED WITH NEW UNIT. CORRECTED PROBLEM. ## NTSB investigations (1) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB MIA02IA160](https://openairdocs.org/ntsb/MIA02IA160), Aug 27, 2002: Eurocopter Deutschland MBB BK-117 A4 (N528SF), Bradenton, FL, incident, minor damage. Probable cause: Improper maintenance/installation of the No. 2 engine power turbine (PT) wheel assembly by company maintenance personnel, which resulted in deflection at the engine case axial midpoint and… ## 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 20020826026219I](https://openairdocs.org/incident/20020826026219I), Aug 26, 2002: Bolkms BK117A4 (N528SF), Bradenton, FL, Minor damage. (-23) On August 26, 2002, at 2035 EDT, a Eurocopter MBB-BK117, N528SF, registered to rocky mountain holdings LLC, experienced an in-flight engine fire and… --- 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.