EASA AD No.: 2009-0117-E 

EASA Form 111 Page 1/2 

EASA EMERGENCY AIRWORTHINESS DIRECTIVE 

AD No.: 2009-0117-E 

Date: 02 June 2009 

Note: This Emergency 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]. 

Type Approval Holder’s Name : 

TURBOMECA 

Type/Model designation(s) : 

ARRIEL 1 series turboshaft engines 

TCDS Number : EASA.E.073 

Foreign AD : Not applicable 

Supersedure : None 

ATA 72 Engine - Module M05 (Reduction Gear Box) Lubrication Duct – 

Inspection / Repair 

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 if modified by TU332 and fitted 

with Modules M05 (Reduction Gear Box) as identified in figure 1 of 

Turboméca Mandatory Service Bulletin (MSB) A292 72 0825. 

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

following helicopters: 

Eurocopter AS350B/BA/BB/B1/B2, EC145/MBB-BK117-C1 and AS365N, 

Agusta A109K2, Sikorsky S-76A+ and S-76A++. 

Reason: Non compliant lubrication ducts, located in Module M05 (Reduction Gear 

Box) front casing, may have been installed during production and repair. 

Non-compliant lubrication ducts are potentially located in modules M05 

listed in the Mandatory Service Bulletin A292 72 0825. 

This non compliance may lead to a loss of the lubrication duct plug, 

followed by a quick draining of the oil tank without indication to the cockpit 

through low oil pressure warning. This could lead to an uncommanded inflight shut down. On a single-engine helicopter, the result may be an 

emergency autorotation landing. 

In addition, an oil leak following the loss of the lubrication duct plug could 

lead to an engine fire. 
EASA AD No.: 2009-0117-E 

EASA Form 111 Page 2/2 

Effective Date: 04June 2009 

Required action(s) 

and Compliance 

Time(s): 

Required as indicated, unless accomplished previously:

(1) Before next flight, inspect the M05 lubrication duct for presence of oil 

leakage, as instructed in paragraphs 1.C.(1)(a), 2.A and figure 2 of 

Turboméca MSB A292 72 0825 version A. 

If oil leakage is found: 

(1.1) Apply the repair procedure defined in paragraph 2.B.(1) and 

figures 3 and 4 of Turboméca MSB A292 72 0825 version A. 

This is the terminating action of this AD. 

If no oil leakage is found: 

(1.2) During the next 75 flight hours repeat the inspection every 4 

flight hours or after the last flight of the day, whichever comes first. 

(1.3) After 75 flight hours, perform the regular oil leakage check after 

the last flight of the day, as defined in Chapter 05-20 of the applicable 

Arriel 1 Engine Maintenance Manual, paying particular attention to the 

M05 lubrication duct per figure 2 of Turboméca MSB A292 72 0825 

version A. 

(2) The repair procedure defined in (1.1) is the terminating action of this 

AD and must be applied within 8 months of the effective date of this 

AD. 

Note: Serial numbers of Modules M05 affected by this AD are listed in 

figure 1 of Turboméca MSB A292 72 0825 version A. The engine serial 

numbers are also provided for information when available. In case of 

conflicts between serial numbers Turboméca should be contacted for 

resolution. 

Ref. Publications: Turboméca Mandatory Service Bulletin (MSB) A292 72 0825 - version A, 

dated 27 May 2009; 

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. The safety assessment has requested not to implement the full 

consultation process and an immediate publication and notification. 

3. Enquiries regarding this AD should be referred to the Airworthiness 

Directives, Safety Management & Research Section, Certification 

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 nearest technical 

representative at www.turbomeca-support.com