EASA AD No.: 2011-0099

EASA Form 110 Page 1/3 

## EASA AIRWORTHINESS DIRECTIVE

AD No.: 2011-0099

Date: 26 May 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 accordan ce with the requirements of that AD, unless otherwi se 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, A rticle 14(4) exemption]. 

### Type Approval Holder’s Name :
BAE SYSTEMS (OPERATIONS) LTD Type/Model designation(s) :
BAe 146 and AVRO 146-RJ aeroplanes

TCDS Number: EASA.A.182

Foreign AD: Not applicable

Supersedure: None



### ATA 21 Air Conditioning - Front and Rear Discharge Valves Fuselage Skin – Inspection / Repair

Manufacturer(s): BAE Systems (Operations) Ltd, Brit ish Aerospace plc, British Aerospace (Commercial Aircraft) Ltd, British Aerospace (Opera tions) Ltd, British Aerospace Regional Aircraft Ltd, British Aerospace Regional Aircraft trading as Avro International Aerospace.
Applicability: BAe 146 and AVRO 146-RJ aeroplanes, all models, all serial numbers, except aeroplanes that have incorporated auto-pressurisati on modification No. HCM50259A during production.
Reason: An operator has reported the cracking and s urface anomalies (bulges and/or dents) of the fuselage skin at the water trap/air d rier unit of the forward discharge valve located between Frames 22 and 23 an d between stringers 22 and 23. Further investigation established that these surfac e anomalies (bulges and/or dents) were due to corrosion beneath the water trap /air drier unit that has resulted in cracking of the fuselage skin. A crack at the subject location could propagate towards the forward discharge valve outle t and result in the failure of the fuselage skin leading to a possible sudden loss of cabin pressure. For the reasons described above, this AD mandates a n initial and repetitive inspections of the fuselage skin adjacent to the fr ont and rear discharge valves, the accomplishment of the associated correctives ac tions if applicable and the application of an additional sealant in the affecte d area.

Effective Date: 09 June 2011EASA AD No.: 2011-0099

EASA Form 110 Page 2/3 Required action(s) and Compliance Time(s): Required as indicated, unless accomplished previous ly: (1) Within 12 months after the effective date of th is AD and thereafter at intervals not exceeding 24 months, perform a Detail ed Visual Inspection (DVI) of the external fuselage skin adjacent to the discharge valve outlets (one frame bay fore and aft, one stringer above and below) to check for bulging, surface anomalies and cracking in accordan ce with the accomplishment instructions of paragraph 2.C. of BA E Systems (Operations) Ltd. ISB 21-162 Revision 1. (2) If, during a DVI as required by paragraph (1) o f this AD, any damage (bulging and/or surface anomalies and/or cracking) is found, before next flight, accomplish the associated corrective action defined in Table 1 of this AD:
Table 1 Damage found: Corrective action
within the criteria as specified in Structural Repair Manual (SRM) 53-00-00 Repair in accordance with the accomplishment instructions of paragraph 2.G. of BAE Systems (Operations) Ltd. ISB 21-162 Revision 1.
exceeds the criteria as specified in SRM 53-00-00 Contact BAE Systems (Operations) Ltd. for approved repair instructions and accomplish those instructions accordingly.

(3) At the next maintenance opportunity, or within 24 months after the effective date of this AD, whichever occurs first, unless a repair has already been accomplished as required by paragraph (2) of this AD, apply additional sealant in accordance with paragraph 2.C .(2) of BAE systems (Operations) Ltd. ISB 21-162 revision 1. Applicatio n of additional sealant does not constitute terminating actions for the rep etitive DVI required by paragraph (1) of this AD. (4) Accomplishment of a repair as required by parag raph (2) of this AD terminates the repetitive inspection requirements o f paragraph (1) of this AD. (5) Accomplishment of any DVI before the effective date of this AD, in accordance with BAE Systems (Operations) Ltd. ISB 2 1-162 at initial issue is acceptable to comply with the initial requiremen t of paragraph (1) of this AD. (6) Accomplishment of a repair before the effective date of this AD in accordance with the instructions of BAE Systems (Op erations) Ltd. ISB 21- 162 at initial issue is acceptable to comply with t he requirements of paragraphs (2) and (4) of this AD.

Ref. Publications: BAE Systems (Operations) Limited Inspection Service Bulletin No. 21-162 Revision 1 dated 16 September 2010.
BAe 146 Series 100/200 and AVRO 146 Series RJ70/RJ8 5 Structural Repair Manual Revision 65 dated 15 September 2010. BAe 146-300 and AVRO 146-RJ100 Structural Repair Ma nual Revision 43 dated 15 September 2010. The use of later approved revisions of these docume nts is acceptable for compliance with the requirements of this AD.EASA AD No.: 2011-0099

EASA Form 110 Page 3/3 Remarks: 1. If requested and appropriately substantiated, EA SA can approve Alternative Methods of Compliance for this AD. 2. This AD was posted on 04 April 2011as PAD 11-035 for consultation until 02 May 2011. No comments were received during the c onsultation period. 3. Enquiries regarding this AD should be referred t o the Airworthiness Directives, Safety Management & Research Section, C ertification 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: BAE Systems (Operations) Ltd, Customer Information Department, Prestwick International Airport, Ayrshire, KA9 2RW, Scotland, United Kingdom; Telephone +44 1292 675207, Facsimile +44 1 292 675704; E-mail: RApublications@baesystems.com

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