EASA AD No.: 2009-0037-E

EASA Form 111 Page 1/2 

## EASA EMERGENCY AIRW ORTHINESS DIRECTIVE

AD No.: 2009-0037-E

Date: 19 February 2009

Note: This Emergency Airworthiness Directive (A D) 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 partici pate 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 a ccomplishing any applicable ADs. Consequently, no person may opera te an aircraft to which an AD applies, except in accordance with the requirements of that AD unless otherwise specified by the Age ncy [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) exemptio n]. 

### Type Approval Holder’s Name : Agusta S.p.A. Type/Model designation(s) :
A109A, A109AII and A109C helicopters

TCDS Number : EASA.R.005

Foreign AD : Not applicable

Supersedure : None



### ATA 72 Engine – Power Turbine Speed – Operational Limitation

Manufacturer(s): Agusta S.p.A.
Applicability: A109A, A109AII and A109C helicopt ers, all serial numbers if equipped with Rolls-Royce Corporation (formerly Allison) engine model 250-C20B or 250- C20R/1 with the third stage turbine wheel part number (P/N) 23065833 installed.
Reason: Following several third stage turbine wheel failures, the engine Type Certificate holder, Rolls-Royce Co rporation, issued Commercial Engine Bulletin (CEB) A-1400 Rev. 3 to introduce an operational limitation on the power turbine N2 speed range (95% - 97%) for more than 60 seconds in single or cumulative events for engines with the third stage turbine wheel P/N 23065833 installed. Thereafter, Agusta issued Bollettino Tecn ico (BT) 109-129 to introduce the same operating limitation, which is also required by this AD, on the affected helicopters.
Effective Date: 20 February 2009

Required action(s) and Compliance Time(s): Required as indicated, unless accomplished previously: Within the next 5 flight hours after the e ffective date of this directive but no later than 28 February 2009, whichever occurs first, accomplish the tasks specified below in accordance with the instructions of Agusta BT 109-129:EASA AD No.: 2009-0037-E

EASA Form 111 Page 2/2 1. Avoid steady-state operation in the 95-97% N2 range for more than 60 seconds in single or cumulative event s. If steady-state operation in the 95-97% N2 range exceeds 60 seconds in single or cumulative events,before further flight perform specific corrective actions as per RollsRoyce CEB A-1400 Rev. 3.
Note : Steady-state operation is defined as any manoeuvre during which an attempt is being made to maintain a constant engine speed within 2% N2. 2. Install on the instruments panel below or near the “ENGINE & ROTOR RPM POWER TURBINE (N2)” indicator, in an area visible by the pilot(s), one of the two decals (depending on the applicable instruments panel configuration) shown in figure 1 of Agusta BT 109-129 reporting the following text:
“MIN. CONT. 97% N2 – MIN. TRANS. 95% N2” 3. A109A and A109AII helicopters: Insert page 5 or 6, as applicable depending on the helicopter model, of Agusta BT 109-129 in the Flight Manual, Section I – OPERATING LIMITATIONS, paragraph “POW ER PLANT LIMITATIONS”. 4. A109C helicopters: Insert page 7 of Agusta BT 109-129 in the Flight Manual, Section I - LIMITATIONS, paragraph “POW ER PLANT AND TRANSMISSION LIMITATIONS”.
Ref. Publications: Agusta Bollettino Tecnico 109-129 dated 16 February 2009. The use of later approved revisions of this document 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 immedi ate publication and notification. 3. Enquiries regarding this AD should be referred to the Airworthiness Directives, Safety Management & Re search Section, Certification Directorate, EASA. E-mail ADs@easa.europa.eu

. 4. For any question concerning the tec hnical content of the requirements in this AD, please contact: Agusta S.p.A. Customer Support – Via per Tornavento, 15 21019 Somma Lombardo (VA) – Italy; Phone: + 39 0331 940396; Fax: + 39 0331 711180; E-mail: custserv@agustawestland.com

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