EASA AD No.: 2011-0207

EASA Form 110 Page 1/2 

## EASA AIRWORTHINESS DIRECTIVE

AD No.: 2011-0207

Date: 20 October 2011

Note: This Airworthiness Directive (AD) is issued b y EASA, acting in accordance with Regulation (EC) No 216/2008 on behalf of the Europe an Community, its Member States and of the European third countries that participate in th e 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 en sured by accomplishing any applicable ADs. Conseque ntly, no person may operate an aircraft to which an AD applies, except in accor dance with the requirements of that AD unless other wise specified by the Agency [EC 2042/2003 Annex I, Part M.A.303] or agreed with the Authority of the State of Registry [EC 216/200 8, Article 14(4) exemption].


### Type Approval Holder’s Name : Agusta S.p.A. Type/Model designation(s) : AB139 and AW139 helicopters

TCDS Number: EASA.R.006

Foreign AD: Not applicable

Supersedure: None



### ATA 29 Hydraulic Power – Hydraulic Systems – Operational C hecks /

Replacement

Manufacturer(s): AgustaWestland S.p.A., Agusta Aero space Corporation (USA)

Applicability: AB139 and AW139 helicopters, all ser ial numbers except serial numbers 31007, 31094, 31293, 31301, 31303, 31313 and 31329.

Reason: A recent assessment of the hydraulic systems of the helicopter led to the conclusions that an operational check of the hydrau lic systems is necessary to ensure its functionality. This condition, if not detected and corrected, coul d lead, in case of multiple failures, to loss of hydraulic power possibly resul ting in loss of control of the helicopter. To address this unsafe condition, AgustaWestland ha ve developed Bollettino Tecnico (BT) 139-269, which gives instructions for an operational check of the power control modules and of the shutoff valves to detect a dormant failure. For the reasons described above, this AD requires a ccomplishment of an operational check of the hydraulic systems and, in case of discrepancies, replacement of the affected power-control module or shutoff valve with a serviceable part.

Effective Date: 03 November 2011

Required Action(s) and Compliance Time(s): Required as indicated, unless already accomplished: (1) Within 50 flight hours or two months, whichever occurs first after the effective date of this AD, accomplish the operation al checks of the powerEASA AD No.: 2011-0207

EASA Form 110 Page 2/2 control modules and of the shutoff valves, in accor dance with the instructions of AgustaWestland BT 139-269. (2) If any operational check as required by paragr aph (1) of this AD fails, before next flight, accomplish the applicable corre ctive actions in accordance with the Aircraft Fault Isolation Public ation (AFIP). (3) Within 30 days after accomplishment of the oper ational checks as required by paragraph (1) of this AD, report the op erational checks results to AgustaWestland.
Ref. Publications: AgustaWestland BT 139-269, dated 30 September 2011. AgustaWestland AFIP. The use of later approved revisions of these docume nts 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 required actions and the risk allowance have granted the issuance of a Final AD with Request for Comments, postponing th e public consultation process after publication. 3. Enquiries regarding this AD should be referred t o the Safety Information Section, Executive 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 AgustaWestland S.p.A. E-mail: aw139.mbx@agustawestland.com

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