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 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 : 

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 installed 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 corrected, may lead to fatigue failure of a 

hydraulic accumulator, possibly resulting in damage to the aeroplane and 

injury to occupants. In addition, a quality 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 2011 
EASA 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 effective date of this AD, replace all 

hydraulic accumulators P/N 08 8423 030 1 with stainless steel hydraulic 

accumulators P/N 40800–2050, and accomplish the associated 

structural modifications in the nose landing gear bay, in accordance 

with the instructions of SAAB Service 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 original 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 & 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: 

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.