EASA AD No.: 2009-0253

EASA Form 110 Page 1/3 

## EASA AIRWORTHINESS DIRECTIVE

AD No.: 2009-0253

Date: 30 November 2009

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 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 en sured by accomplishing any applicable ADs. Conseque ntly, no person may operate an aircraft to which an Airworthiness Directive app lies, except in accordance with the requirements of that Airworthiness Directive unless otherwise specified by the Agency [EC 2042/2 003 Annex I, Part M.A.303] or agreed with the Autho rity of the State of Registry [EC 216/2008, Article 14(4) exemption]. 

### Type Approval Holder’s Name :
ROLLS-ROYCE PLC Type/Model designation(s) :
RB211-524 Series Engines

TCDS Number : UK-CAA TCDS No.s 1043, 1046 and 1048

Foreign AD : N/A

Supersedure : This AD supersedes AD No. 2009-0089 dated 16 April 2009



### ATA 78 Engine – Thrust Reverser Unit (TRU) – Replacement o f Damaged Rivets on Thrust Reverser Fixed Structure

Manufacturer(s): Rolls-Royce plc

Applicability: RB211-524D4-19, -524D4-B-19,-524D4-3 9, -524D4-B-39, -524D4X-19, - 524D4X-B-19, -524H-36, -524H2-19, -524H-T-36, -524H 2-T-19, -524G2-19, -524G3-19, -524G2-T-19 and –524G3-T-19 engines, all serial numbers, if equipped with a Thrust Reverser having a part numbe r as identified in RollsRoyce RB211 Propulsion Systems Non-Modification Ser vice Bulletin (NMSB) No. 78-AG084 Revision 3. These engines are known to be installed, but not li mited to Boeing 747 and Boeing 767 series aircraft.
Reason: An investigation into the loss of a TRU dur ing landing has revealed that this incident was preceded by the detachment of the TRUs fixed structure front ring rivet lines on the rear flange. It was conclud ed that the loss of rivet lines was directly associated with a previous translating cowl gearbox stubshaft fracture and the subsequent repair of the fixed str ucture to Engine Manual repair No. FRS5887. This repair instructs the repla cement of the damaged section of the structure but does not require the r ivets adjacent to the repair to be replaced although latest analysis has shown t hat the rivets may have weakened as a result of a translating cowl gearbox stubshaft failure. Loss of a TRU during landing may release a signific ant amount of debris and this may adversely affect the safety of flight oper ations. Thus, the loss of aEASA AD No.: 2009-0253

EASA Form 110 Page 2/3 TRU constitutes a potentially unsafe condition. EASA AD No. 2009-0089 was issued to instruct replac ement of potentially yielded rivets from TRUs in service in order to pre vent a further TRU loss. Further engineering evaluation carried out by Rolls -Royce concluded that the Compliance Times required by this AD can be partial ly extended. This AD supersedes AD No. 2009-0089 and is issued i n order to extend the applicability of the Required Actions contained in AD No. 2009-0089 to RB211-524D4X-19 engines and also to partially exten d the Compliance Times originally required by AD No. 2009-0089. This AD includes additional compliance criteria with respect to an earlier tran slating cowl gearbox stubshaft failure in order to enable operators to f urther limit the population of potentially affected engines.

Effective Date: 14 December 2009

Required Action(s) and Compliance Time(s): 1. If a TRU has previously had Engine Manual repair No. FRS5887 and either Engine Manual repair No. FRS4976 or Engine M anual repair No. FRS6669 embodied jointly as a result of a translati ng cowl gearbox stubshaft failure
and the actions specified in Section 3. Accomplishment Instructions of RollsRoyce Non-Modification Service Bulletin (NMSB) No. 78-AG084 Revision 3 or earlier approved revisions have not been carried out yet, carry out the actions specified in Section 3. Accom plishment Instructions of Rolls-Royce Non-Modification Service Bulletin (NMSB ) No. 78-AG084 Revision 3 or later approved revisions before 31 st March 2010. Important Note: Unless unambiguous documented evidence exists to de monstrate otherwise, a translating cowl gearbox stubshaft failure should be assumed. 2. If a TRU has previously had Engine Manual repair No. FRS4976 embodied as a resu lt of a translating cowl gearbox stubshaft failure

or Engine Manual repair No. FRS6669 embodied as a resu lt of a translating cowl gearbox stubshaft failure
and it is not known whether this was performed jointly with Engine Manual repair No. FRS5887
and the actions specified in Section 3. Accomplishment Instructions of RollsRoyce Non-Modification Service Bulletin (NMSB) No. 78-AG084 Revision 3 or earlier approved revisions have not been carried out yet, carry out the actions specified in Section 3. Accom plishment Instructions of Rolls-Royce Non-Modification Service Bulletin (NMSB ) No. 78-AG084 Revision 3 or later approved revisions before 31 st March 2010. Important Note: Unless unambiguous documented evidence exists to demonstrate otherwise, a translating cowl gearbox s tubshaft failure should be assumed. 3. If a TRU has previously had only Engine Manual r epair No. FRS5887 embodied as a result of a translating cowl gearbox stubshaft failure
and the actions specified in Section 3. Accomplishment Instructions of Rolls-EASA AD No.: 2009-0253

EASA Form 110 Page 3/3 Royce Non-Modification Service Bulletin (NMSB) No. 78-AG084 Revision 3 or earlier approved revisions have not been carried out yet, carry out the actions specified in Section 3. Accom plishment Instructions of Rolls-Royce Non-Modification Service Bulletin (NMSB ) No. 78-AG084 Revision 3 or later approved revision before 31 st December 2012. Important Note: Unless unambiguous documented evidence exists to demonstrate otherwise, a translating cowl gearbox s tubshaft failure should be assumed.
Ref. Publications: Rolls-Royce RB211 Propulsion Sys tem Non-Modification Service Bulletin (NMSB) No. 78-AG084, Revision 3 The use of later approved revisions of this documen t is acceptable for compliance with the requirements of this AD.

Remarks : 1. If requested and appropriately substantiated, EA SA 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 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: Rolls-Royce plc ., P.O. Box 31, Derby, DE24 8BJ, United Kingdom Telephone: +44 (0) 1332 242424, Fax: +44 (0) 1332 2 49936, E-mail: tech.help@rolls-royce.com or download the publication from https://www.aeromanager.com