EASA AD No.: 2011-0004

EASA Form 110 Page 1/2 

## EASA AIRWORTHINESS DIRECTIVE

AD No.: 2011-0004

Date: 17 January 2011

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 accomplishing 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 :

SAAB AB, Aeronautics Type/Model designation(s) :
2000 aeroplanes

TCDS Number : EASA.A.069

Foreign AD : Not applicable

Supersedure : None



### ATA 29 Hydraulic Power – Hydraulic Accumulator – Replacement

Manufacturer(s): SAAB AB , Aeronautics (formerly Saab Aircraft AB).

Applicability: Model 2000, all serial numbers.

Reason: Three cases of failure have been reported, affecting the same type of hydraulic accumulator as insta lled on SAAB 2000 aeroplanes, although all occurred on other aeroplane types. The reported cause of these failures has been traced to corrosion. Any of the end parts on the accumulator may depart from the pressure vessel if they are affected by corrosion. This condition, if not detected and correc ted, may lead to fatigue failure of a hydraulic accumulator, possibly resulting in damage to the aeroplane and injury to occupants. In addition, a qualit y issue during the replacement of the base material in the end parts of the accumulator may have affected the service life of the accumulator. To address this unsafe condition, SAAB has introduced a new type of hydraulic accumulator, which is made of stainless steel. For the reasons described above, this AD requires the replacement of all Part Number (P/N) 08 8423 030 1 hydraulic accumulators with stainless steel P/N 40800–2050 hydraulic accumulators and associated structural modifications in the nose landing gear bay.

Effective Date: 31 January 2011EASA AD No.: 2011-0004

EASA Form 110 Page 2/2 Required Action(s) and Compliance Time(s): Required as indicated, unless accomplished previously: (1) Within 12 months after the effe ctive date of this AD, replace all hydraulic accumulators P/N 08 8423 03 0 1 with stainless steel hydraulic accumulators P/N 40800–2050, and accomplish the associated structural modifications in the no se landing gear bay, in accordance with the instructions of SAAB Se rvice Bulletin (SB) 2000-29-024. (2) After modification of an aeroplane as required by paragraph (1) of this AD, do not install a hydraulic accumulator P/N 08 8423 030 1 on that aeroplane.
Ref. Publications: SAAB SB 2000-29-024 orig inal issue dated 18 November 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. This AD was posted on 17 November 2010 as PAD 10-117 for consultation until 15 December 2010. No comments were received during the consultation period. 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 te chnical content of the requirements in this AD, please contact: SAAB AB, Aeronautics, Bröderna Ugglas gata, SE-581 88 Linköping, Sweden Telephone: +46 13 185591, Fax: +46 13 184874 E-mail: saab2000.techsupport@saabgroup.com

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