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Aircraft record

N528SF1986 Eurocopter Deutschland Gmbh MBB BK-117 A4

DeregisteredUnclaimedSource: FAA, updated Oct 20, 2026

This N-number isn't registered right now. Below is its last known registration, canceled Mar 10, 2017.

Safety record in brief:1 NTSB incident (minor damage, Aug 2002)13 ADs may apply48 service difficulty reports

Registration
Deregistered
Last based in
Provo, UT
owner city / state
Engine
LTS101-600 SR · 650 hp
Honeywell
Owners
1
since 2001
NTSB events
1
minor, 2002
ADs may apply
13
confirm with A&P
Service reports
48
since 1995

Registration

FAA Aircraft Registry · Oct 20, 2026
Last registered owner
Rocky Mountain Holdings LLC
Owner type
Corporation
City, state
Provo, UT
Certificate issued
Apr 19, 2001
Canceled
Mar 10, 2017
Airworthiness
Standard · Transport
Airworthiness date
Nov 20, 1986

We never show street addresses, even though they appear in the public FAA file. Individual owners are shown by city and state only.

Airframe & engine

FAA Registry + type data

Airframe

Manufacturer
Eurocopter Deutschland Gmbh
Model
MBB BK-117 A4
Year
1986
Serial number
7104
Aircraft type
Rotorcraft
Category
Land
Certification
Type Certificated
Seats
8
Engines
2
Max takeoff weight
Up to 12,499 lb
Type certificate data sheet
H13EU
Mode S code
A6A83C

Engine

Make and model
Honeywell Lts101-600 Sr
Type
Turbo-shaft
Power
650 hp

Total time and engine hours aren't public. They appear here once the owner adds logbooks.

Ownership history

Ownership history from FAA records
  1. 2001 – 2017Rocky Mountain Holdings LLCProvo, UT

Individual owners are shown by city and state only.

Safety record

NTSB · Oct 15, 2026 · FAA ADs · Oct 20, 2026 · SDRs · Oct 16, 2026

NTSB events (1)

Incident · minor damage

Aug 27, 2002 · Bradenton, FL

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 misalignment between the inlet housing and the rear bearing support housing (RBSH) which resulted in damage to the engine and an in-flight fire.

Damage
Minor
Injuries
None
Report
MIA02IA160

From NTSB records; matched by serial number.Read NTSB report (search CAROL for MIA02IA160)

ADs published since 1998 that may apply (13)

These match the airframe or engine model. Whether each one applies, and whether it's been complied with, depends on serial numbers, equipment and logbook entries. Applicability must be confirmed by a mechanic against the aircraft's records.

ADSubjectEffectiveApplies to
2021-05-07Airbus Helicopters Deutschland GmbH (Type Certificate Previously Held by Eurocopter…Apr 16, 2021Airframe (MBB BK-117 A4)Only with: Model BO-105A, BO-105C, and BO-105S helicopters only with voltage regulator P/N 51565-000, 51565-000R, or 51509-002R installed; MBB-BK 117 models apply unconditionally.
2019-05-05Airbus Helicopters Deutschland GmbH (Previously Eurocopter Deutschland GmbH) HelicoptersApr 17, 2019Airframe (MBB BK-117 A4)Only with: Main rotor (M/R) mast assembly part number 4639 205 011 installed.
2016-01-14Airbus Helicopters Deutschland GmbH (Previously Eurocopter Deutschland GmbH) HelicoptersFeb 25, 2016Airframe (MBB BK-117 A4)
2014-06-51Airbus Helicopters Deutschland GmbH (Airbus Helicopters) (Type Certificate Previously…Jul 30, 2014Airframe (MBB BK-117 A4)Only with: Metro Aviation, Inc. vapor-cycle air conditioning kit pulley P/N 30001 installed in accordance with STC No. SH3880SW.
2013-16-13Eurocopter Deutschland GmbH HelicoptersSep 27, 2013Airframe (MBB BK-117 A4)Only with: With specified tail rotor control lever and tail rotor balance weight part numbers installed (varies by model: BO-105A/C/S/LS A-1 levers P/N 105-317231, 105-317365, 105-31736, 105-31767, 105-31728, 1121-31730 with weights P/N 117-31715.01, 117-31715.02, 105-31728.03, 105-31732.07, 105-31732.08; BO-105LS A-3 levers P/N 105-31736, 105-31767 with weights P/N 117-31715.01, 117-31715.02, B642M1011 201, 105-317171.10; MBB-BK 117 levers P/N 117-31730, 117-317361, 105-31736 with weights P/N 117-31714.07, 117-31715.01, 117-31720.01, 117-31730.02).
Show all 13 ADs
ADSubjectEffectiveApplies to
2013-11-15Eurocopter Deutschland GmbH HelicoptersJul 26, 2013Airframe (MBB BK-117 A4)Certain serial numbers: EC135 P1 0005–0699; EC135 P2 0005–0699; EC135 P2+ 0005–0699; EC135 T1 0005–0699; EC135 T2 0005–0699; EC135 T2+ 0005–0699; …. Only with: BO-105A/C/S/LS A-1 with cantilever assembly P/N 105-40132 or 105-40139; BO 105 LS A-3 with cantilever assembly P/N 105-40139; EC135 (excluding S/Ns 0076, 0093, 0098, 0099, 0102, 0104, 0106, 0108, 0110, 0111, 0113, 0114, 0116, 0117, 0119) with cyclic stick locking device P/N L670M1045101/-102/-104/-105/-106/-107 and pin P/N L311M1038205 or L311M1099205; MBB-BK117 A-1 through C-1 with cyclic stick holder assembly P/N 117-41140-01, 117-41230-01 or 117-41230-03; MBB-BK117 C-2 with cyclic stick locking device P/N B856M1011101 and pin P/N L311M1038205 or L311M1099205 installed.
2012-13-11Eurocopter Deutschland GmbH HelicoptersAug 7, 2012Airframe (MBB BK-117 A4)Serial numbers per Appendix 1 of Able Engineering & Component Services Alert Service Bulletin No. 2012-001, Revision IR, dated March 7, 2012. Only with: Tail rotor pitch link P/N 117-31821, 117-31822, or B642M1018101 with a serial number listed in Appendix 1 of Able ASB No. 2012-001 installed.
2001-22-07Honeywell International, Inc. LTP 101 Series Turboprop and LTS101 Series Turboshaft…Nov 30, 2001Engine (LTS101-600 SR)Only with: Rigid tube fuel manifolds P/N 4-301-042-02, -04, -05, -06, 4-301-236-01, -02, -03, -04, 4-301-286-01, -02, or 4-301-376-01 installed.
2000-26-06Eurocopter Deutschland GMBH Model MBB-BK 117 HelicoptersFeb 26, 2001Airframe (MBB BK-117 A4)
2000-08-16Eurocopter Deutschland GMBH Model MBB-BK 117 A-1, A-3, A-4, B-1, B-2, and C-1 HelicoptersJun 2, 2000Airframe (MBB BK-117 A4)Certain serial numbers: 7001–7253; 7500–7523. Only with: With transmission door cowling LH P/N 117-23206-51 or 117-233731, RH P/N 117-23206-52 or 117-233741, and engine door cowling LH P/N 117-23303-51 or 117-23303-53, RH P/N 117-23303-52 or 117-23303-54 installed.
98-24-13Eurocopter Deutschland GmbH (ECD) (Eurocopter) Model MBB-BK117 A-1, A-3, A-4, B-1, B-2…Dec 4, 1998Airframe (MBB BK-117 A4)
97-23-07Eurocopter Deutschland GmbH Model MBB- BK 117 A-1, A-3, A-4, B-1, B-2 and C-1 HelicoptersNov 5, 1997Airframe (MBB BK-117 A4)Certain serial numbers: MBB-BK 117 A-1 7001–7250; MBB-BK 117 A-3 7001–7250; MBB-BK 117 A-4 7001–7250; MBB-BK 117 B-1 7001–7250; MBB-BK 117 B-2 7001–7250; MBB-BK 117 C-1 7500–7520. Only with: With clutch P/N 4639302044 or P/N CL42067-1 installed.
95-21-12Eurocopter Deutschland GmbH (ECD) Model MBB-BK 117 A-1, A-3, A-4, B-1, B-2, and C-1…Nov 20, 1995Airframe (MBB BK-117 A4)

AI-extracted — verify against original. Matched from each AD's applicability section; ADs replaced by a later AD are left out.

Service Difficulty Reports (48)

Reports of failures and defects that operators and repair stations sent to the FAA since 1995. A report describes one finding; it is not an accident.

  • Engine indicating · transducer · inoperativeJun 3, 2002

    PRESSURE TRANSDUCER, UNIT INOPERATIVE. INCORRECT READINGS, 40 PERCENT TOO HIGH (FLUCTUATING). REPLACED WITH NEW UNIT, CORRECTED PROBLEM.

    From FAA Service Difficulty Reports; matched by N-number and serial number.
  • Engine · seal · leakingOct 19, 2001

    NR3 BEARING SEAL LEAKING BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.

    From FAA Service Difficulty Reports; matched by N-number and serial number.
  • Engine indicating · transducer · inoperativeJun 8, 2001

    PRESSURE TRANSDUCER INOPERATIVE. REPLACED WITH NEW UNIT, CORRECTED PROBLEM. (M)

    From FAA Service Difficulty Reports; matched by N-number and serial number.
Show all 10 reports
  • Engine · housing · wornJul 28, 1999

    HOUSING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.

    From FAA Service Difficulty Reports; matched by N-number and serial number.
  • Engine · cover · wornJul 28, 1999

    COVER WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.

    From FAA Service Difficulty Reports; matched by N-number and serial number.
  • Engine · vane · crackedJul 28, 1999

    VANE CRACKED BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.

    From FAA Service Difficulty Reports; matched by N-number and serial number.
  • Engine · seal · wornJul 28, 1999

    SEAL RING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.

    From FAA Service Difficulty Reports; matched by N-number and serial number.
  • Engine · spring · wornJul 28, 1999

    SPRING WORN BEYOND SERVICEABLE LIMITS. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.

    From FAA Service Difficulty Reports; matched by N-number and serial number.
  • Engine · seal · damagedJul 28, 1999

    LABYRINTH SEAL EXCESSIVELY GROOVED. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.

    From FAA Service Difficulty Reports; matched by N-number and serial number.
  • Engine · bearing · corrodedJul 28, 1999

    BREARING HAS EXCESSIVE PITTING. REPLACED WITH NEW UNIT, CORRECTED PROBLEM.

    From FAA Service Difficulty Reports; matched by N-number and serial number.

Showing the 10 most recent of 48 reports.

Related aircraft

Sources

  • FAA Aircraft RegistryRegistration, owner city and state, airframe, engineupdated Oct 20, 2026
  • NTSB accident and incident databaseAccidents and incidents since 1982updated Oct 15, 2026
  • FAA Airworthiness Directives (Federal Register)ADs published since 1998updated Oct 20, 2026
  • FAA Service Difficulty ReportsReports since 1995updated Oct 16, 2026

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