EASA AD No.: 2012-0230

TE.CAP.00110-003 © European Aviation Safety Agency. All rights reserved. 1/3 Proprietary document. Copies are not controlled. Co nfirm revision status through the EASA-Internet/Int ranet. 

## EASA AIRWORTHINESS DIRECTIVE

AD No.: 2012-0230

Date: 30 October 2012

Note: This Airworthiness Directive (AD) is issued b y EASA, acting in accordance with Regulation (EC) No 216/2008 on behalf of the European Communit y, its Member States and of the European third countries that participate in the ac tivities of EASA under Article 66 of that Regulation.

This AD is issued in accordance with EU 748/2012, P art 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].



### Design Approval Holder’s Name:
Rolls-Royce Deutschland Ltd & Co KG 

### Type/Model designation(s):
BR700-715 engines

TCDS Number: EASA.E.023

Foreign AD: Not applicable

Supersedure: None



### ATA 72 Engine – High Pressure Compressor Rotor Disc Assemb ly – Removal

Manufacturer(s): Rolls-Royce Deutschland (RRD) Ltd & Co KG

Applicability: BR700-715A1-30, BR700-715B1-30 and B R700-715C1-30 engines, all serial numbers. These engines are known to be installed on, but not limited to Boeing 717 aeroplanes.

Reason: Silver chloride-induced stress corrosion cr acking was identified during overhaul of a BR700-715 engine, on the High Pressure Compres sor (HPC) stages 1 to 6 rotor disc assembly. Subsequent evaluation conclude d that the affected part life limitation values declared in the engine Time Limit s Manual cannot be supported for high cyclic life HPC discs.
This condition, if not corrected, could lead to unc ontained HPC disc failure, possibly resulting in damage to, and/or reduced con trol of the aeroplane. To address this potential unsafe condition, RRD iss ued Alert Non-Modification Service Bulletin (NMSB) SB-BR-700-72-A900401 to ins truct a one-time removal from service of HPC stage 1 to 6 rotor disc assemblies before exceeding thresholds, as applicable to engine model and type of mission, identified in that NMSB.
For the reasons described above, this AD requires a one-time removal from service of the affected parts and their replacement with a serviceable part.

Effective Date: 06 November 2012EASA AD No.: 2012-0230

TE.CAP.00110-003 © European Aviation Safety Agency. All rights reserved. 2/3 Proprietary document. Copies are not controlled. Co nfirm revision status through the EASA-Internet/Int ranet. Required Action(s) and Compliance Time(s): Required as indicated, unless accomplished previous ly: Note 1: For the purpose of this AD, flight cycles ( FC) means total actual engine cycles since new without any pro-rata calculations applied for different flight missions. Guidance for the total actual eng ine cycle calculation, for the purpose of this AD, is given in the Notice to Operators BR715 engines NTO No: 184, dated 25 October 2012. BR700-715A1-30 Engines operated under Hawaiian Flig ht Mission only: (1) After the effective date of this AD, before exc eeding 16 000 flight cycles accumulated since new by the HPC stage 1 to 6 rotor disc assembly, replace the HPC stage 1 to 6 rotor disc assembly wi th a serviceable part in accordance with the instructions of RRD Alert NMSB SB-BR-700-72- A900401.
BR700-715A1-30, BR700-715B1-30 and BR700-715C1-30 E ngines (All Flight Missions except Hawaiian Flight Mission): (2) After the effective date of this AD, before exc eeding 14 000 FC accumulated since new by the HPC stage 1 to 6 rotor disc assembly, replace the HPC stage 1 to 6 rotor disc assembly wi th a serviceable part in accordance with the instructions of RRD Alert NMSB SB-BR-700-72- A900401. (3) For engines, listed in the Table 1 of this AD, with a HPC stage 1 to 6 rotor disc assembly, which on the effective date of this AD, has already accumulated or exceeded 14 000 FC since new, within the compliance time identified in Table 2 of this AD, replace the HPC stage 1 to 6 rotor disc assembly with a serviceable part in accordance with the instructions of RRD Alert NMSB SB-BR-700-72-A900401.

Table 1 Engine serial numbers (S/N) affected by the paragraph (3) of this AD

Engine S/N 13125, 13153, 13164, 13172, 13173, 13180 , 13251, 13282,

13288, 13302, 13321,13326 and 13330.

Table 2 Compliance time

FC accumulated since new by the HPC stage 1 to 6 rotor disc assembly Compliance time after the effective date of this AD

Equal to or more than 14 000 FC but less than 15 500 FC Within 300 FC

Equal to or more than 15 500 FC Within 40 FC

Note 2: A one-time replacement of HPC Stage 1 to 6 rotor disc assembly as required by paragraphs (1), (2) and (3) of this AD terminates requirement of this AD.

Ref. Publications: RRD Alert NMSB SB-BR700-72-A9004 01 dated 25 October 2012. The use of later approved revisions of this documen t is acceptable for compliance with the requirements of this AD. RRD Notice to Operators BR715 engines NTO No: 184, dated 25 October 2012.

Remarks: 1. If requested and appropriately substantiated, EA SA can approve Alternative Methods of Compliance for this AD.
2. Based on the required actions and the compliance time, EASA have decided to issue a Final AD with Request for Commen ts, postponing theEASA AD No.: 2012-0230

TE.CAP.00110-003 © European Aviation Safety Agency. All rights reserved. 3/3 Proprietary document. Copies are not controlled. Co nfirm revision status through the EASA-Internet/Int ranet. public consultation process until after publication

. 3. Enquiries regarding this AD should be referred t o the Safety Information Section, Executive 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 Deutschland Ltd & Co KG, Eschenweg 11, 15827 Dahlewitz, Germany. Telephone: +49 (0) 33 7086 1200; Fax: +49 (0) 33 70 86 1212. E-mail: rrd.tech.help@rolls-royce.com

.