EASA AD No .: 20 12

- 0060

E ASA Form 110 Page 1 / 3 

## EASA AIRWORTHINESS DIRECTIVE

AD No
. : 20 12 - 0060

Date: 1 8 April 2012

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 Eur opean 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, P art 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 : Rolls

- Royce plc Type/Model designation(s) : RB211

- 524 and RB211

- 535 Engines TCDS Number s : U nited K ingdom No. 1046, 1048, 1044 and 1049
F oreign AD: N ot applicable Supersedure: N one



### ATA 73 Engine
– Intermediate Pressure Turbine Disc
– Identification / Inspection / Re placement
Manufacturer(s): Rolls

- Royce plc Applicability: RB211

- 524G2

- 19, RB211

- 524 G2

- T

- 19, RB211

- 524 G3

- 19, RB211

- 524 G3

- T

- 19, RB211

- 524 H2

- 19 , RB211

- 524 H2

- T

- 19 , RB211

- 524H

- 36 and RB211

- 524H

- T

- 36 engines, all serial numbers

. These engines are known to be installed on, but not limited to, Boeing 747 and Boeing 767 series a e r oplanes

. RB211

- 535E4

- 37 , RB211

- 535E4

- B

- 37 , RB211

- 535E4

- B

- 75 and RB211

- 535E4

- C

- 37 e ngines , all serial numbers. These engines are known to be installed on, but not limited to, Boeing 757 and Tupolev Tu204 series a e r oplanes

. Reason: The inspection of several i ntermediate p ressure ( IP ) t urbine d iscs at past en gine overhauls identified the presence of steel inclusions in these parts. Further investigation concluded that all affected parts were manufactured from billets produced before 1997 at a certain supplier who also melted steel in the same furnaces. Init ial engineering evaluation concluded that the lives of the parts would not be affected by the presence of the said steel inclusions. This evaluation has been recently repeated , utilising improved structural analysis , and it is now concluded that the curren tly published lives of the components cannot be supported for some discs with a steel inclusion. This condition, if not corrected, could l e ad to an uncontained IP t urbine d isc failure , possibly resulting in damage to, and reduced control of, the aeroplane

. For the reasons described above , this AD requ ires removal and inspection of certain IP t urbine d iscs and , depending on findings, replacement with a serviceable part. This AD also prohibits ( re ) installation of certain IP turbine discs on an engine. Eff ective Date: 0 2 May 2012EASA AD No .: 20 12

- 0060

E ASA Form 110 Page 2 / 3 Required A ction(s) and Compliance Time(s) : Required as indicated, unless accomplished previously: (1) During the next engine shop visit after the effective date of this AD where the Module 05 is removed from the engine for disasse mbly where any casing is removed or, i n case that, on the effective date of this AD, an engine happens to be in such a shop visit, identify the Part Number (P/N) and serial number (s/n) of the IP turbine disc installed on the engine

. (2) I f a turbine disc is installed with a P/N as listed in Table 1 of this AD and a s/n as listed in Appendix 1 (for RB211

- 524 G and

- 524H series engines ) or Appendix 2 (for RB211

- 535 E4 series engines ), as applicable, of Rolls

Royce Propulsion Systems Non

- Modification Service Bu lletin (NMSB) RB211

- 72

- AG493 Revision 1 (hereafter referred to as the NMSB) , accomplish the following action, as applicable : (2.1) If the accumulated life (in cycles) of the IP turbine disc exceeds the i nspection t hreshold , but is below the m aximum l ife as identified in the applicable Time Limits Manual , or below the maximum life as specified in Appendix 1 (for RB211

- 524 G and

- 524H series engines ) or Appendix 2 (for RB211

- 535 E4 series engines ) of the NMSB, as applicable , r emove the IP t urbine d isc from the engine and accomplish an inspection in accordance with the instructions of Section 3 of the NMSB. (2.2) If the accumulated life (in cycles) of the IP turbine disc is below the inspection threshold, before the IP turbine disc exceeds that inspection thresho ld, remove the IP turbine disc from the engine and accomplish an inspection in accordance with the instructions of Section 3 of the NMSB

. Note 1 : As an alternative to the inspection required by paragraph (2 .1 ) or (2.2) of this AD, as applicable, it is acce ptable to replace the removed IP turbine disc with a serviceable part.

Table 1

– Affected IP Turbine Discs Engine type IP turbine disc P/N

RB211

- 524G and RB211

- 524H series engines LK82335 UL27958 UL37681 UL37721

RB211

- 524G

- T and RB211

- 524H

- T serie s engines UL38383 UL38384 UL38467 UL38929 UL38930

RB211

- 535 E4 series engines UL17774 UL19818 UL27940

Note 2: A typographical error has been identified in Appendix 4 “SQUID inspection of RB211 IP Turbine Disc QCTP” of Rolls

- Royce Propulsion S ystems NMSB RB211

- 72

- AG493 Revision 1, dated 11 November 2011. Part reference UL82335 should read LK 82335, as in Table 1 of this AD.EASA AD No .: 20 12

- 0060

E ASA Form 110 Page 3 / 3 ( 3 ) If the results of an inspec tion as required by paragraph (2 ) of this AD do not meet the criteria as detailed in Appen dix 4 of the NMSB, or if the affected IP turbine disc has reached or exceeded its life limit, as specified in Appendix 1 (for RB211

- 524 G and

- 524H series engines ) or Appendix 2 (for RB211

- 535 E4 series engines ) of the NMSB, as applicable, before returning t he engine to service, replace the disc with a serviceable part. ( 4 ) From the effective date of this AD, do not install on any engine an IP turbine disc with a P/N as listed in Table 1 of this AD and a s/n as listed in Appendix 1 or Appendix 2 of the NMSB, as applicable to engine model, except in accordance with the inspection and replacement requirements of this AD.
Ref. Public ations: Rolls

- Royce Propulsion Systems NMSB RB211

- 72

- AG493 Revision 1 , dated 11 November 2011. The use of later approved revisions of th i s 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 01 February 2012 as PAD 12

- 007 fo r consultation until 29 February 2012

. The Comment Response Document can be found at http://ad.easa.europa.eu

. 3. Enquiries regarding this A D should be referred to the Safety Information Section , Executive Directorate, EASA. E

- mail ADs@easa.europa.eu

. 4. For any question concerning the technical content of the requirements in this AD, please contact y our designated Rolls

- Royce representative, or download the publication from your Aeromanager account at www.aeromanager.com , or contact at Rolls

- Royce plc. Corporate Communications, P.O. Box 31, Derby, DE24 8BJ, United Kingdom, telephone: +44 (0) 1332 242424, or send an e

- mail through http://www.rolls

- royce.com/contact/civil_team.jsp identifying the correspondence as being related to Airworthiness Directives

.