EASA AD No.: 2012-0187

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EASA AIRWORTHINESS DIRECTIVE

AD No.: 2012-0187

Date: 18 September 2012

Note: This Airworthiness Directive (AD) is issued by EASA, acting in accordance with Regulation 

(EC) No 216/2008 on behalf of the European Community, its Member States and of the 

European third countries that 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 be ensured by accomplishing any applicable ADs. Consequently, no person may operate an 

aircraft to which an AD applies, except 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].

Design Approval Holder’s Name:

TURBOMÉCA

Type/Model designation(s):

ARRIEL 1 engines

TCDS Number: EASA.E.073

Foreign AD: Not applicable

Supersedure: None

ATA 72 Engine – Airworthiness Limitation Section – Cycle Counting Aid 

System – Modification/Amendment

Manufacturer(s): Turboméca S.A.

Applicability: ARRIEL 1A1, 1A2, 1B, 1C, 1C1, 1C2, 1D, 1D1, 1E2, 1K, 1K1, 1S and 1S1 

turbo-shaft engines, all serial numbers.

These engines are known to be installed on, but not limited to, Eurocopter 

(formerly Eurocopter France, Aerospatiale) AS 350 B, BA, BB, B1 and B2, and 

AS 365 N, Eurocopter Deutschland (formerly Messerschmidt-Bölkow-Blohm) 

MBB-BK117-C1 and -C2, AgustaWestland (formerly Agusta) A 109 K2, and 

Sikorsky S-76A helicopters.

Reason: Following detailed analysis and review of in-service feedback performed by

Turboméca on the Arriel 1 engines, the chapter 05-10 Airworthiness Limitation 

Section (ALS) of Arriel 1 Maintenance Manuals has been updated in order to

clarify the definition and update the requirements relative to the cycle counting 

aid system (modification introduced in production by Turboméca modification 

TU207 or TU243 and in-service, respectively, by Turboméca Service Bulletin 

(SB) 292800190 or SB 292800168), add associated maintenance tasks, and 

modify the Power Turbine (PT) partial cycle counting method.

For the reasons described above, this AD requires to implement the set of 

modifications applied to the chapter 05-10 ALS of the Arriel 1 Maintenance 

Manuals.

Effective Date: 02 October 2012
EASA AD No.: 2012-0187

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Required Action(s) 

and Compliance 

Time(s):

Required as indicated, unless accomplished previously:

(1) From the effective date of this AD, record the updated definition of the 

cycle counting aid system and apply the updated PT partial cycle counting 

method and, within the intervals specified in chapter 05-10 ALS of the 

ARRIEL 1 Maintenance Manual, as applicable to engine Model, as listed in 

Appendix 1 of this AD, accomplish the following tasks:

New mandatory tasks associated with the cycle counting aid system 

(requirements applicable to engines modified in production with 

Turboméca modification TU207 or TU243 or in service, respectively, with 

Turboméca SB 292800190 or SB 292800168), and defined as follows:

- ”Cycle Counting” coherence/consistency check

- Functional check for the “Cycle Counting” function of the Tachometer 

Unit.

(2) Compliance with the requirements of paragraphs (1) of this AD can be 

demonstrated by:

(2.1) Revising as follows the approved Aircraft Maintenance Programme 

(AMP) and standard practices on the basis of which the operator or 

the owner ensures the continuing airworthiness of each operated 

helicopter:

Incorporate the updates described in paragraph (1) of this AD and

defined in the chapter 05-10 of the applicable Arriel 1 Maintenance 

Manual.

and

(2.2) Complying with the approved AMP described in paragraph (2.1) of 

this AD.

Ref. Publications: Turboméca ARRIEL 1 Maintenance Manuals, as listed in Appendix 1 of this 

AD.

The use of later approved revisions of these documents is acceptable for 

compliance with the requirements of this AD.

Remarks: 1. If requested and appropriately substantiated, EASA can approve 

Alternative Methods of Compliance for this AD.

2. This AD was posted on 20 August 2012 as PAD 12-110 for consultation 

until 17 September 2012. No comments were received during the 

consultation period.

3. Enquiries regarding this AD should be referred to the Safety Information 

Section, Executive Directorate, EASA. E-mail: ADs@easa.europa.eu.

4. For any question concerning the technical content of the requirements in 

this AD, please contact:

Turboméca, S.A., ARRIEL 1 Customer Support,

40220 Tarnos, France, Fax: +33 5 59 74 45 15, or

contact your usual or nearest Turboméca technical representative at 

www.turbomeca-support.com.
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Appendix 1

Maintenance Manuals according to Engine Variant, with initial issue/version incorporating the additional 

requirement of this AD in the ALS:

Engine Variant

Maintenance Manual

French Version English Version

ARRIEL 1A1 X 292 B3 452 1 Issue 14 X 292 B3 452 2 Issue 14

ARRIEL 1A2 X 292 A9 452 1 Issue 15 X 292 A9 452 2 Issue 15

ARRIEL 1B X 292 65 452 1 Issue 14 X 292 65 452 2 Issue 14

ARRIEL 1C X 292 B0 452 1 Issue 15 X 292 B0 452 2 Issue 15

ARRIEL 1C1 X 292 C3 452 1 Issue 15 X 292 C3 452 2 Issue 15

ARRIEL 1C2 X 292 G1 452 1 Issue 15 X 292 G1 452 2 Issue 15

ARRIEL 1D X 292 E5 452 1 Issue 15 X 292 E5 452 2 Issue 15

ARRIEL 1D1 X 292 G2 452 1 Issue 15 X 292 G2 452 2 Issue 15

ARRIEL 1E2 X 292 M3 452 1 Issue 15 X 292 M3 452 2 Issue 15

ARRIEL 1K X 292 D8 452 1 Issue 15 X 292 D8 452 2 Issue 15

ARRIEL 1K1 X 292 H3 452 1 Issue 15 X 292 H3 452 2 Issue 15

ARRIEL 1S X 292 F9 452 1 Issue 15 X 292 F9 452 2 Issue 15

ARRIEL 1S1 X 292 H4 452 1 Issue 15 X 292 H4 452 2 Issue 15