Airworthiness Directive · Amendment 39-16871 · Turbomeca S.A. Arriel 2B Turboshaft Engines
Turbomeca S.A. Arriel 2B Turboshaft Engines
This AD applies to Turbomeca Arriel 2B turboshaft engines with a hydromechanical unit (HMU) that has a part number (P/N) and serial number (S/N) listed in Table 1 of this AD installed.
| P/Ns | S/Ns |
|---|---|
| 0292860750 | 1008B |
| 0292860750 | 1068B |
| 0292860750 | 1142B |
| 0292860750 | 1143B |
| 0292860750 | 1183B |
| 0292860750 | 1230B |
| 0292860750 | 272B |
| 0292860750 | 275B |
| 0292860750 | 342B |
| 0292860750 | 363B |
| 0292860750 | 422B |
| 0292860750 | 436B |
| 0292860750 | 499B |
| 0292860750 | 524B |
| 0292860750 | 536B |
| 0292860750 | 560B |
| 0292860750 | 598B |
| 0292860750 | 606B |
| 0292860750 | 647B |
| 0292860750 | 652B |
| 0292860750 | 716B |
| 0292860750 | 749B |
| 0292860750 | 763B |
| 0292860750 | 806B |
| 0292860750 | 830B |
| 0292860750 | 861B |
| 0292860750 | 944B |
| 0292860750 | 967B |
| 0292861020 | 632B |
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Unless already done, do the following actions.
(f) Before further flight, perform a one-time functional test of the engine to confirm proper engine operation. This one-time functional test is not a normal engine run-up test. Use the instructions in paragraph 2.B.(1)(a) of Turbomeca Alert Mandatory Service Bulletin No. A292 73 2841, Version A, dated July 4, 2011, to perform the functional test.
(1) If the engine fails the functional test, replace the HMU with an HMU eligible for installation.
(2) If the engine passes the functional test, do the following:
(i) Within four months after the effective date of this AD, install software modification TU143 on the Engine Electronic Control Unit of the engine. Use paragraph 2.B. of Turbomeca Service Bulletin No. 292 73 2143, dated July 24, 2007 to do the installation; and
(ii) Within 12 months after the effective date of this AD, replace the HMU with an HMU eligible for installation.
For the purpose of this AD, an HMU eligible for installation is defined as one with a serial number not listed in Table 1 of this AD, or, an HMU that passed when tested using Turbomeca Service Bulletin No. 292 73 2840.
None.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
