ROLLS-ROYCE DEUTSCHLANDTay

ID: 17-133
Issue date: 2017-09-29
Source: EASA
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Engine – Low Pressure Compressor Fan Blades – Identification / Replacement send comment

EASA PAD No.: 17-133


Notification of a Proposal to issue
an Airworthiness Directive
PAD No.: 17-133
Issued: 29 September 2017
Note: This Proposed Airworthiness Directive (PAD) is issued by EASA, acting in accordance with
Regulation (EC) 216/2008 on behalf of the European Union, its Member States and of the
European third countries that participate in the activities of EASA under Article 66 of that
Regulation.

In accordance with the EASA Continuing Airworthiness Procedures, the Executive Director is proposing the issuance of an EASA Airworthiness Directive
(AD), applicable to the aeronautical product(s) identified below.
All interested persons may send their comments, referencing the PAD Number above, to the e-mail address specified in the ‘Remarks’ section, prior to
the consultation date indicated..


Design Approval Holder’s Name: Type/Model designation(s):
ROLLS-ROYCE DEUTSCHLAND Ltd & Co KG Tay 650-15 and Tay 651-54 engines

Effective Date:
[TBD - standard: 14 days after AD issue date]
TCDS Number(s): EASA.E.063
Foreign AD: Not applicable
Supersedure: None


ATA 72 – Engine – Low Pressure Compressor Fan Blades – Identification /
Replacement


Manufacturer(s):

Rolls-Royce plc.

Applicability:

Tay 650-15 and Tay 651-54 engines, all manufacturer serial numbers (s/n), equipped with low
pressure compressor (LPC) module M01300AA or M01300AB.

Reason:

Fractures of low pressure compressor (LPC) fan blade retention lugs were reported on engines
subjected to a high number of Dry Film Lubrication (DFL) treatment. Subsequent investigation
determined that this had exposed the retention lugs of the affected LPC (fan) blades to excessive
high stress cycles.

This condition, if not detected and corrected, could lead to failure of LPC fan blade retention lug(s),
high vibration, reduced thrust or in flight shut down, possibly resulting in reduced control of the
aeroplane.




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EASA PAD No.: 17-133

To address this potential unsafe condition, Rolls Royce Deutschland (RRD) issued Alert
Non-Modification Service Bulletin (NMSB) TAY-72-A1833 (hereafter referred to as ‘the NMSB’) to
provide identification and replacement instructions.

For the reasons described above, this AD requires determination of number of DFL treatments
applied to the LPC fan blades and, based on that determination, replacement. This AD also
introduces a maximum allowable number of DFL treatments applicable to the LPC fan blades.

Required Action(s) and Compliance Time(s):

Required as indicated, unless accomplished previously:

Note 1: Group 1 engines are those equipped with a LPC fan blade identified by Part Number (P/N)
JR31911, P/N JR33865, or P/N JR33866, and having an s/n listed in Appendix 1 of the NMSB. Group
2 engines are all other engines.

Determination:
(1) For Group 1 and Group 2 engines: Within 30 days after the effective date of this AD, determine
the number of application of DFL treatment on each affected LPC fan blade by reviewing the
engine maintenance records or using an alternative method specified in, and in accordance
with, the instructions of the NMSB.

Corrective Action(s):
(2) If it is determined, as required by paragraph (1) of this AD, that the number of DFL treatments
is less than 13, during the next LPC fan blade removal after the effective date of this AD,
identify the affected LPC blade by applying a specific suffix code mark on the blade dovetail
root in accordance with the instructions of the NMSB.

(3) Group 1 engines, and those Group 2 engines for which the maintenance programme includes
scheduled DFL treatment: If it is determined, as required by paragraph (1) of this AD, that the
number of DFL treatments is 13 or more, but less than 20, within 500 flight hours (FH) after the
effective date of this AD, accomplish the applicable corrective action(s) in accordance with the
instructions of the NMSB, to ensure that no LPC fan blade with 13 to 20 DFL treatments is
installed on more than one engine on the same aeroplane.

(4) If it is determined, as required by paragraph (1) of this AD, that the number of DFL treatments
is 20 or more, within 500 FH after the effective date of this AD, remove each affected LPC fan
blade from service and replace it with a serviceable part in accordance with the instructions of
the NMSB.

(5) For Group 2 engines for which the maintenance programme includes DFL treatment: Within 30
days after the effective date of this AD contact RRD for approved instructions and, within the
compliance time indicated in those instructions, accomplish those instructions accordingly.

Parts Installation:
(6) From the effective date of this AD, it is allowed to install on any engine an affected LPC fan
blade, or an LPC module M01300AA or M01300AB, or to install an engine, equipped with an
affected LPC fan blade or LPC module M01300AA or M01300AB, on an aeroplane, provided that


TE.CAP.00112-005 © European Aviation Safety Agency. All rights reserved. ISO9001 Certified. Page 2 of 3
Proprietary document. Copies are not controlled. Confirm revision status through the EASA-Internet/Intranet.
An agency of the European Union
EASA PAD No.: 17-133

the LPC fan blade passed an assessment and identification in accordance with the instructions
of the NMSB, and that, following installation, the LPC fan blade is replaced before exceeding 12
DFL treatments.

(7) From the effective date of this AD, do not install on any engine an LPC fan blade that has
received 13 DFL treatment or more.

Ref. Publications:

RRD Alert NMSB TAY-72-A1833 original issue dated 18 September 2017.

The use of later approved revisions of this document is acceptable for compliance with the
requirements of this AD.

Remarks:
1. This Proposed AD will be closed for consultation on 27 October 2017.

2. Enquiries regarding this PAD should be referred to the EASA Safety Information Section,
Certification Directorate. E-mail: ADs@easa.europa.eu.

3. For any question concerning the technical content of the requirements in this PAD, please
contact: Rolls-Royce Deutschland Ltd & Co KG, Eschenweg 11, Dahlewitz, 15827 Blankenfelde-
Mahlow, Germany, Telephone: +49 (0) 337086 1200, E-mail: rrd.techhelp@rolls-royce.




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This is a partial extract of the full document - please refer to the actual report for full information.
Sources as credited.