EASA AD No.: 2010-0101-E

EASA Form 111 Page 1/3 

## EASA EMERGENCY AIRWORTHINESS DIRECTIVE

AD No.: 2010-0101-E

Date: 04 June 2010

Note: This Emergency Airworthiness Directive (AD) i s issued by EASA, acting in accordance with Regulation (EC) No 216/2008 on beha lf of the European Community, its Member States and of the European third countries t hat participate in the activities of EASA under Article 66 of that Regulation
This AD is issued in accordance with EC 1702/2003, Part 21A.3B. In accordance with EC 2042/2003 Annex I, Part M.A.301, the continuing airworthiness of an aircraft shall b e ensured by accomplishing any applicable ADs. Cons equently, no person may operate an aircraft to which an AD applies, exc ept in accordance with the requirements of that AD unless otherwise specified by the Agency [EC 2042/2003 Annex I, Part M.A.303] or agreed with the Authority of the State of Registry [EC 216/2008, Article 14(4) exemption].


### Type Approval Holder’s Name :
Turboméca Type/Model designation(s) :
ARRIEL 1 series turboshaft engines

TCDS Number : EASA.E.073

Foreign AD : Not applicable

Supersedure : None



### ATA 72 Engine – Module M03 (Gas Generator) – Post-TU347 S econd Stage Turbine Disc – Reduced Life Limit

Manufacturer(s): Turboméca S.A.
Applicability: Arriel 1A, 1A1, 1B, 1C, 1C1, 1C2, 1D , 1D1 and 1S1 turbo-shaft engines, all serial numbers if modified by TU347. These engines are known to be installed on, but not limited to, the following helicopters: Eurocopter AS350 series, AS365 and SA365 series, Si korsky S-76A series and C series.
Reason: Metallurgical non-conformities have been fo und when performing quality inspections during production of Arriel 1 Gas Gener ator (GG) second Stage Turbine Discs introduced by Turboméca Modification TU347 (P/N 0 292 25 040 0). Analysis has concluded that the approved li fe limit of the postTU347 GG second Stage Turbine Disc needs to be redu ced to 2 500 GG cycles. Exceeding the revised approved life limit could res ult in a GG second Stage Turbine Disc burst with uncontained high energy deb ris. To address this unsafe condition, this AD requires compliance with the revised life limit of the GG second Stage Turbine D isc by removing the module M03 (Gas Generator) or the GG second Stage T urbine fitted with a GG second stage Turbine Disc which has reached or e xceeded the new life limit.EASA AD No.: 2010-0101-E

EASA Form 111 Page 2/3 Effective Date: 06 June 2010

Required Action(s) and Compliance Time(s): Required as indicated, unless accomplished previous ly: (1) Within the compliance time as indicated in Tabl e 1, as applicable, replace the module M03 (Gas Generator) or the GG se cond Stage Turbine, in accordance with Turboméca Mandatory Ser vice Bulletin (MSB) A292 72 0831 version A.
Table 1: Second Stage Turbine Disc Accumulated GG cycles on the Effective Date of this AD: Compliance time:

2 500 or more 20 GG cycles after the effective date of this AD Less than 2 500 Upon accumulating 2 500 GG cycles (2) Compliance with the requirements of paragraph ( 1) of this AD can be demonstrated by: (2.1) Revising as follows, unless accomplished prev iously, the approved Aircraft Maintenance Programme from which the Operator or the Owner ensures the continuing airwor thiness of each operated helicopter, as well as the Engine log book and Module M03 log card: Incorporate the new life limit (2 500 GG cycles) of the GG second Stage Turbine Disc P/N 0 292 25 040 0 specified in Turboméca Mandatory Service Bulletin (MSB) A292 72 0831 versi on A.
and (2.2) Complying with the approved Aircraft Maintena nce Programme as described in paragraph (2.1) of this AD. (3) After the effective date of this AD, do not ins tall a post-TU347 GG second Stage Turbine Disc (P/N 0 292 25 040 0) unle ss in compliance with paragraphs (1) and (2) of this AD. Note: For all engines fitted with post-TU347 GG sec ond Stage Turbine Discs, Turboméca plans to update the Airworthiness Limitation Section of the Engine Maintenance Manual Chapter 05 – INSPECTIONS – FREQUENCIES, Chapter 05-10-03, Task 0 5-10-03- 900-801-A01, Par. Service Life Limits – Life Limit Values, in order to set the new life limit of the GG second Stage Turbi ne Disc P/N 0 292 25 040 0. The references of the Engine Maintenance Manuals to be updated are in Appendix of this AD (French / Englis h versions).
Ref. Publications: Turboméca Mandatory Service Bull etin (MSB) A292 72 0831 version A dated 02 June 2010. The use of later approved revisions of this documen t is acceptable for compliance with the requirements of this AD.

Remarks : 1. If requested and appropriately substantiated, EA SA can approve Alternative Methods of Compliance for this AD. 2. The safety assessment has requested not to imple ment the full consultation process and an immediate publication a nd notification. 3. Enquiries regarding this AD should be referred t o the Airworthiness Directives, Safety Management & Research Section, C ertification Directorate, EASA. E-mail: ADs@easa.europa.eu

. 4. For any question concerning the technical conten t of the requirements in this AD, please contact:EASA AD No.: 2010-0101-E

EASA Form 111 Page 3/3 Turboméca, S.A., ARRIEL 1 Customer Support, 40220 T ARNOS, FRANCE. Fax: +33 5 59 74 45 15 or contact your near est technical representative at www.turbomeca-support.com



### APPENDIX

Maintenance Manuals according to Engine Variant:

Maintenance Manual Engine Variant French Version English Version

ARRIEL 1A 292 01 931 n/a

ARRIEL 1A1 X 292 B3 452 1 X 292 B3 452 2

ARRIEL 1B X 292 65 452 1 X 292 65 452 2

ARRIEL 1C X 292 B0 452 1 X 292 B0 452 2

ARRIEL 1C1 X 292 C3 452 1 X 292 C3 452 2

ARRIEL 1C2 X 292 G1 452 1 X 292 G1 452 2

ARRIEL 1D X 292 E5 452 1 X 292 E5 452 2

ARRIEL 1D1 X 292 G2 452 1 X 292 G2 452 2

ARRIEL 1S1 X 292 H4 452 1 X 292 H4 452 2