EASA AD No.: 2013-0142

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EASA AIRWORTHINESS DIRECTIVE

AD No.: 2013-0142

Date: 12 July 2013

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 European third countries that participate in the activities of EASA under Article 66 of that 

Regulation.

This AD is issued in accordance with EU 748/2012, Part 21.A.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, Part M.A.303] or agreed with the Authority of the State of Registry [EC 216/2008, Article 14(4) exemption].

Design Approval Holder’s Name:

Rolls-Royce Deutschland Ltd & Co KG

Type/Model designation(s):

Tay 620, Tay 650 and Tay 651 engines

TCDS Number: EASA.E.063

Foreign AD: Not applicable

Supersedure: This AD supersedes EASA AD 2013-0086 dated 09 April 2013.

ATA 75

Air – Air Control Regulator and Actuator / High Pressure Air Bleed 

Valve / Operating Mechanism – Inspection 

Manufacturer(s): Rolls-Royce plc

Applicability: Tay 620-15, Tay 620-15/20, Tay 650-15, Tay 650-15/10 and Tay 651-54 

engines, all serial numbers.

These engines are known to be installed on, but not limited to, Fokker F28 

Mark 0070 and Mark 0100, and on Boeing 727 (STC-modified) series 

aeroplanes.

Reason: A review of the service history of Tay engines discovered that the High 

Pressure (HP) air bleed valve operating mechanism is exposed to excessive 

deterioration, influencing the aerodynamics and stability of the Low Pressure 

(LP) compressor (fan) rotor.

This condition, if not corrected, could reduce fan flutter margin and, in some 

cases, could lead to multiple fan blade failures, possibly resulting in an 

uncontained release of high energy debris with consequent damage to, and/or 

reduced control of, the aeroplane.

To address this potential unsafe condition, Rolls-Royce Deutschland Ltd & Co 

KG (RRD) issued Alert Non-Modification Service Bulletin (NMSB) 

TAY-75-A1784 to provide instructions for inspection of the HP air bleed valve 

operating mechanism for Tay 650-15 and Tay 650-15/10 engines. 

Consequently, EASA issued AD 2013-0086 to require implementation of a 

one-time inspection for the affected parts.

Since that AD was issued, RRD issued NMSB TAY-75-A1784 Revision 1 to 

make the HP air bleed valve operating mechanism inspection also applicable 
EASA AD No.: 2013-0142

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to Tay 620-15, Tay 620-15/20 and Tay 651-54 engines, due to similarity of 

installed HP air bleed valve operating mechanism failure cause and failure 

effect.

For the reasons described above, this AD retains the requirements of AD 

2013-0086, which is superseded, and expands the Applicability to Tay 620-15 

and Tay 651-54 engines.

Effective Date: 26 July 2013

Required Action(s) 

and Compliance 

Time(s):

Required as indicated, unless accomplished previously:

(1) For Tay 650-15 and 650-15/10 engines: Within 1 500 flight cycles (FC) 

after 23 April 2013 [the effective date of AD 2013-0086] inspect the HP air 

bleed valve operating mechanism in accordance with the instructions of

RRD NMSB TAY-75-A1784.

(2) For Tay 620-15, 620-15/20 and 651-54 engines: Within 1 500 FC after the 

effective date of this AD inspect the HP air bleed valve operating 

mechanism in accordance with the instructions of RRD NMSB TAY-75-

A1784.

(3) If, during the inspections as required by paragraph (1) or (2) of this AD, 

the measured torque, necessary to open and close the HP air bleed valve,

is higher than the applicable values referenced in RRD NMSB 

TAY-75-A1784, before next flight, accomplish all corrective actions in 

accordance with RRD NMSB TAY-75-A1784.

(4) For Tay 650-15 and Tay 650-15/10 engines, inspection and corrective 

action of an engine, accomplished before the effective date of this AD in 

accordance with the instructions of RRD Alert NMSB TAY-72-A1784 at 

initial issue, is acceptable to comply with the requirement of paragraphs 

(1) and (2) of this AD for that engine.

Ref. Publications: RRD Alert NMSB TAY-75-A1784 Revision 1 dated 30 May 2013.

The use of later approved revisions of this 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. Based on the required actions and the compliance time, EASA have 

decided to issue a Final AD with Request for Comments, postponing the 

public consultation process until after publication.

3. Enquiries regarding this AD 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:

Rolls-Royce Deutschland Ltd & Co KG

Eschenweg 11 – 15827 Dahlewitz – Germany

Tel. + 49 3370861200 (direct 1016) Fax + 49 3370861212.

E-mail: RRDTechnicalHelpdesk@Rolls-Royce.com.