EASA AD No.: 2009-0137

EASA Form 110 Page 1/2 

## EASA AIRWORTHINESS DIRECTIVE

AD No.: 2009-0137

Date: 23 June 2009

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 participat e 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) :
A109E helicopters

TCDS Number : EASA.R.005

Foreign AD : Not applicable

Supersedure : None



### ATA 24 Electrical Power – Battery Bus (BATT BUS) Circuit Breaker – Modification

Manufacturer(s): Agusta S.p.A.
Applicability: A109E helicopters: - all serial numbers (S/N) up to S/ N 11077 included, if equipped with a kit part number (P/N) 109-0812-04-101, -103, -107 or -109; - from S/N 11078 to S/N 11758 included, except S/N 11741,11754 and 11757.
Reason: Following a report of an electrical failure on one A109E helicopter, the investigations done by the Type Certific ate holder Agusta have identified the inadequate functioning of the 35 Amperes (Amps) BATT BUS circuit breaker as the reason for the electrical failure. To prevent this unsafe condition, Agusta has developed a BATT BUS circuit breaker modification kit, for the replacement of the 35 Amps circuit breaker with a 50 Amps circuit breaker and the replacement of the wires with oversized ones. This AD requires installing this modification on the affected helicopters.
Effective Date: 07 July 2009

Required action(s) and Compliance Time(s): Required as indicated, unless accomplished previously: Within 50 flight hours after the effectiv e date of this AD but no later than 31 December 2009, whichever occurs first, modify the fuselage electrical installation P/N 109-0741-49 and the overhead panel electrical installationEASA AD No.: 2009-0137

EASA Form 110 Page 2/2 P/N 109-0741-55, installing the BATT BU S circuit breaker modification kit P/N 109-0824-73-101, in accordance wi th the instructions of Agusta Bollettino Tecnico 109EP-98.
Ref. Publications: Agusta Bollettino Tecnico 109EP-98 dated 22 June 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 required actions and the risk allowance have granted the issuance of a Final AD with Request for Comments, postponing the public consultation process after publication. 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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