Airworthiness directives › 2005-12-08
AD 2005-12-08 Airworthiness Directives; Turbomeca S.A. Arrius 2 B1, 2 B1A, 2 B1A-1, and 2 B2 Turboshaft Engines
Applicability*9
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.
Compliance
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. Onetime Upgrade of Engine Electronic Control Unit (EECU) Software (f) 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. Table 1.—Applicable MSBs 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. Alternative Methods of
Unsafe condition
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.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1