Safety record in brief:1 NTSB accident (substantial damage, May 2025)12 ADs may apply14 service difficulty reports
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Maintenance personnel’s failure to identify and replace damaged rivet nuts at the air conditioning louver assembly, which resulted in the separation of the louver assembly from the helicopter, the louver assembly’s impact with the tail rotor, and subsequent loss of helicopter control.
From NTSB records; matched by serial number.Read NTSB report (search CAROL for ERA25LA204)
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.
| AD | Subject | Effective | Applies to |
|---|---|---|---|
| 2021-05-07 | Airbus Helicopters Deutschland GmbH (Type Certificate Previously Held by Eurocopter… | Apr 16, 2021 | Airframe (MBB-BK 117 C-1)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. |
| 2019-05-05 | Airbus Helicopters Deutschland GmbH (Previously Eurocopter Deutschland GmbH) Helicopters | Apr 17, 2019 | Airframe (MBB-BK 117 C-1)Only with: Main rotor (M/R) mast assembly part number 4639 205 011 installed. |
| 2016-01-14 | Airbus Helicopters Deutschland GmbH (Previously Eurocopter Deutschland GmbH) Helicopters | Feb 25, 2016 | Airframe (MBB-BK 117 C-1) |
| 2013-16-13 | Eurocopter Deutschland GmbH Helicopters | Sep 27, 2013 | Airframe (MBB-BK 117 C-1)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). |
| 2013-11-15 | Eurocopter Deutschland GmbH Helicopters | Jul 26, 2013 | Airframe (MBB-BK 117 C-1)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. |
| AD | Subject | Effective | Applies to |
|---|---|---|---|
| 2012-13-11 | Eurocopter Deutschland GmbH Helicopters | Aug 7, 2012 | Airframe (MBB-BK 117 C-1)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. |
| 2012-09-11 | Eurocopter Deutschland GMBH Helicopters | Jul 9, 2012 | Airframe (MBB-BK 117 C-1)Only with: Turbomeca Arriel 1E2 engine installed with a Fuel Control Unit (FCU) not modified with Turbomeca Modification TU 358. |
| 2000-26-06 | Eurocopter Deutschland GMBH Model MBB-BK 117 Helicopters | Feb 26, 2001 | Airframe (MBB-BK 117 C-1) |
| 2000-08-16 | Eurocopter Deutschland GMBH Model MBB-BK 117 A-1, A-3, A-4, B-1, B-2, and C-1 Helicopters | Jun 2, 2000 | Airframe (MBB-BK 117 C-1)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. |
| 98-24-13 | Eurocopter Deutschland GmbH (ECD) (Eurocopter) Model MBB-BK117 A-1, A-3, A-4, B-1, B-2… | Dec 4, 1998 | Airframe (MBB-BK 117 C-1) |
| 97-23-07 | Eurocopter Deutschland GmbH Model MBB- BK 117 A-1, A-3, A-4, B-1, B-2 and C-1 Helicopters | Nov 5, 1997 | Airframe (MBB-BK 117 C-1)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. |
| 95-21-12 | Eurocopter Deutschland GmbH (ECD) Model MBB-BK 117 A-1, A-3, A-4, B-1, B-2, and C-1… | Nov 20, 1995 | Airframe (MBB-BK 117 C-1) |
AI-extracted — verify against original. Matched from each AD's applicability section; ADs replaced by a later AD are left out.
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.
INSTRUMENT PANEL STIFFENER CRACKED
From FAA Service Difficulty Reports; matched by N-number and serial number.FOUND OIL LEAKING AROUND VERTICAL FIN AREA. INSPECTED AREA AND FOUND TAIL ROTOR GEARBOX LEAKING AND NOTICED THAT TAIL ROTOR CASTING WAS ALSO CRACKED. UPON DISASSEMBLY FOUND THAT TAIL ROTOR HEAD BOLT HAS BEEN GALLED AND TEFLON FROM TORSION TENSION STRAP HAS BEEN FORCED OUT AND DAMAGED T/R HEAD AND…
From FAA Service Difficulty Reports; matched by N-number and serial number.IN CRUISE FLIGHT, TO PICK UP A PATIENT AT 2500MSL, ACFT EXPERIENCED A T/R CHIP LIGHT. THE ACFT COMPLETED THE EMERGENCY PROCEDURE FOR SAME, DIVERTED TO AN AIRPORT ABOUT 3 MILES AWAY, CALLING THE COMM CENTER AND ADVISED OF THE SITUATION. NORMAL SHUTDOWN COMPLETED AND MECHANIC NOTIFIED. AMC PILOT…
From FAA Service Difficulty Reports; matched by N-number and serial number.WHILE PERFORMING A PREFLIGHT A CRACK WAS FOUND IN THE TAIL ROTOR BLADE NEAR THE DATA TAG.
From FAA Service Difficulty Reports; matched by N-number and serial number.GAUGE BACKLIGHTING INOPERATIVE. REPLACED WITH SERVICABLE UNIT. 05/05/2004
From FAA Service Difficulty Reports; matched by N-number and serial number.BLOWER FAILED OUT OF BOX. REPLACED WITH SERVICABLE UNIT. 02/12/2004
From FAA Service Difficulty Reports; matched by N-number and serial number.FIRE DAMAGE, N2 WIRE OUTER INSULATION. REPLACED WITH SERVICEABLE UNIT 02/09/2004
From FAA Service Difficulty Reports; matched by N-number and serial number.WARRANTY- COVERED BY SUPPORT BY HOUR. UNIT EXTREMELY WORN. REPLACED WITH SERVICEABLE UNIT. 02/09/2004
From FAA Service Difficulty Reports; matched by N-number and serial number.WARRANTY. UNIT COVERED UNDER SUPPORT BY HOUR. UNIT EXTREMELY WORN. REPLACED WITH SERVICEABLE UNIT. 02/09/2004
From FAA Service Difficulty Reports; matched by N-number and serial number.TAIL ROTOR ACTUATOR LOWER BUSHING DEFECTIVE. REPLACED WITH SERVICEABLE UNIT. 12/11/03
From FAA Service Difficulty Reports; matched by N-number and serial number.Showing the 10 most recent of 14 reports.