EASA AD No.: 2012-0187R2 

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EASA AIRWORTHINESS DIRECTIVE 

AD No.: 2012-0187R2

Date: 06 December 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 EU 748/2012, Part 21.A.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 

Revision: This AD revises EASA AD 2012-0187R1 dated 11 October 2012. 

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 Messerschmitt-BölkowBlohm) 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. 

Failure to comply with the instructions contained in these documents could 

result in an unsafe condition. 

To address this potential unsafe condition, EASA issued AD 2012-0187, 

requiring implementation of the changes applied to the chapter 05-10 ALS of 
EASA AD No.: 2012-0187R2 

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the ARRIEL 1 Maintenance Manuals. 

After it was found that only Temporary Revisions of the Maintenance 

Manuals, referenced in Appendix 1 of EASA AD 2012-0187, were available, 

EASA revised the AD to add references in Appendix 1 of the AD to those 

Maintenance Manual Temporary Revisions as alternatives to quoted issues 

of Maintenance Manuals which were not be available yet. 

Since EASA AD 2012-0187R1 was issued, EASA was made aware that 

some operators have the engine cycle counting aid system installed on their 

engine, but do not use it. 

For the reason described above, this AD is revised to confirm that, if the 

cycle counting aid system is installed on the engine but is not used, the 

requirements of this AD do not apply to that engine. 

Effective Date: Revision 2: 13 December 2012 

Revision 1: 25 October 2012 

Original issue: 02 October 2012 

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 or alternatively Maintenance 

Manual Temporary Revision (T/R), 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 or, alternatively, Maintenance Manual T/R 

 and 

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

this AD. 

(3) If the engine cycle counting aid system is installed on the engine but is 

not used, the requirements of paragraphs (1) and (2) of this AD are not 

applicable. 

Ref. Publications: Turboméca ARRIEL 1 Maintenance Manuals or Maintenance Manual T/R, 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. 
EASA AD No.: 2012-0187R2 

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

Alternative Methods of Compliance for this AD. 

2. The original issue of 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. 
EASA AD No.: 2012-0187R2 

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Appendix 1 

Maintenance Manuals and Maintenance Manual T/Rs, according to Engine Variant, respectively, with initial 

issue/version and reference incorporating the additional requirement of this AD in the ALS:

Engine Variant 

Maintenance Manual Maintenance Manual 

Temporary Revision 

French Version English Version French and English 

Reference 

ARRIEL 1A1 X 292 B3 452 1 Issue 14 X 292 B3 452 2 Issue 14 05-11 

ARRIEL 1A2 X 292 A9 452 1 Issue 15 X 292 A9 452 2 Issue 15 05-06 

ARRIEL 1B X 292 65 452 1 Issue 14 X 292 65 452 2 Issue 14 05-11 

ARRIEL 1C X 292 B0 452 1 Issue 15 X 292 B0 452 2 Issue 15 05-11 

ARRIEL 1C1 X 292 C3 452 1 Issue 15 X 292 C3 452 2 Issue 15 05-11 

ARRIEL 1C2 X 292 G1 452 1 Issue 15 X 292 G1 452 2 Issue 15 05-11 

ARRIEL 1D X 292 E5 452 1 Issue 15 X 292 E5 452 2 Issue 15 05-11 

ARRIEL 1D1 X 292 G2 452 1 Issue 15 X 292 G2 452 2 Issue 15 05-12 

ARRIEL 1E2 X 292 M3 452 1 Issue 15 X 292 M3 452 2 Issue 15 05-13 

ARRIEL 1K X 292 D8 452 1 Issue 15 X 292 D8 452 2 Issue 15 05-05 

ARRIEL 1K1 X 292 H3 452 1 Issue 15 X 292 H3 452 2 Issue 15 05-06 

ARRIEL 1S X 292 F9 452 1 Issue 15 X 292 F9 452 2 Issue 15 05-07 

ARRIEL 1S1 X 292 H4 452 1 Issue 15 X 292 H4 452 2 Issue 15 05-11