Airworthiness Directive · Amendment 39-14124 · Turbomeca S.A. Arrius 2 B1, 2 B1A, 2 B1A-1, and 2 B2 Turboshaft Engines
Turbomeca S.A. Arrius 2 B1, 2 B1A, 2 B1A-1, and 2 B2 Turboshaft Engines
Superseded. A later AD replaced this one: AD 2021-26-26. Comply with the one in force.
This AD applies to Turbomeca S.A. Arrius 2 B1, 2 B1A, 2 B1A-1, and 2 B2 turboshaft engines. These engines are installed on, but not limited to, Eurocopter Deutschland GmbH EC 135 T1 and EC 135 T2 helicopters.
The FAA is adopting a new airworthiness directive (AD) for Turbomeca S.A. Arrius 2 B1, 2 B1A, 2 B1A-1, and 2 B2 turboshaft engines. This AD requires replacing the software in the Engine Electronic Control Unit (EECU). This AD results from a report of simultaneous loss of automatic control of both engines of a Eurocopter Deutschland EC 135 helicopter, during flight. We are issuing this AD to prevent simultaneous loss of automatic control of both engines and subsequent loss of control of the helicopter.
You are responsible for having the actions required by this AD performed within 90 days after the effective date of this AD, unless the actions have already been done.
Simultaneously, on both engines of the helicopter, perform a onetime upgrade of EECU software as follows:
(1) Either replace the EECU; or
(2) Upload the EECU software.
(3) Use paragraph 2 of the applicable Turbomeca Mandatory Service Bulletin (MSB) listed in Table 1 of this AD, to do the onetime upgrade.
| For— | Use— |
|---|---|
| Arrius 2 B1 engines with EECUs that have incorporated Modification TU 19C | MSB No. 319 73 2080, Update No. 1, dated February 13, 2004. |
| Arrius 2 B1 engines with EECUs that have incorporated Modification TU 67C or TU 23C | MSB No. 319 73 2081, Update No. 1, dated February 13, 2004. |
| Arrius 2 B1A and 2 B1A-1 engines | MSB No. 319 73 2082, Update No. 1, dated February 13, 2004. |
| Arrius 2 B2 engines | MSB No. 319 73 2090, dated February 13, 2004. |
