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SERVICE LETTER
NIC 07.21.SL Rev. 00 July 11, 2007

GE Oil & Gas
Nuovo Pignone S.p.A. Proprietary Information

CLASSIFICATION
INFORMATION INSPECTION OTHER

The information contained in this Service Letter is confidential and proprietary. This Letter and the information contained in it are protected by copyright and/or other intellectual property rights. This Letter and information areprovided for authorized use only, and may not be used by or disclosed to others without the prior express written consent of Nuovo Pignone S.p.A.

GAS TURBINE ROTOR INSPECTIONS
Abstract
This Service Letter is to inform Customers of the applicability of the GE Energy Services TIL 1576 to GE Oil & Gas packaged units and/or under its service.

Applicable Fleet
MS3002, MS5001, MS5002, MS6001,MS7001 and MS9001 Gas Turbine Models.

Background
Refer to the attached TIL 1576

Recommendation
Refer to the attached TIL 1576. For Gas Turbine models MS5001 N, P and PA see also GE Oil & Gas’ NIC 06.02 rev. 0.

Contacts
For units under warranty, or covered under a Contractual Service Agreement (CSA) please refer to your GE Oil & Gas Project Manager. For application and commercial questionsplease contact: Mr. MATTEO PACINI Technical Updates & SER/TES/TECH/TEUP GE Oil & Gas Via Felice Matteucci, 2 50127 Firenze, Italy e-Mail: matteo.pacini@ge.com Phone: (+39) 055 423.8465 Fax: (+39) 055 423.2800 Applications

Nuovo Pignone S.p.A.

Via Felice Matteucci, 2 | 50127 Florence, Italy T: +39 055 423 211 F: +39 055 423 2800 Subject to Proprietary and Confidential restrictions

Page 1/4 SERVICE LETTER
NIC 07.21.SL Rev. 00 July 11, 2007

For technical questions please contact: Mr. GIUSEPPE PEDULLA’ HD Gas Turbines Customer SER/TES/CUST/HDTUGA GE Oil & Gas Via Felice Matteucci, 2 50127 Firenze, Italy e-mail: giuseppe.pedulla@ge.com Phone: (+39) 055 423.8193 Fax: (+39) 055 423.2800 Support

NOTE: If you would like to receive future NICs and SLs by e-mail, please contactthe GE Oil & Gas Technical Updates office at the following e-mail address: energy.technicalupdatecommunication@ge.com

Nuovo Pignone S.p.A.

Via Felice Matteucci, 2 | 50127 Florence, Italy T: +39 055 423 211 F: +39 055 423 2800 Subject to Proprietary and Confidential restrictions

Page 2/4

SERVICE LETTER
NIC 07.21.SL Rev. 00 July 11, 2007

Glossary of Terms
Classification Theclassification column of the header identifies the severity of the Service Letter as Indicated below: INFORMATION – Provides Customers with updates to instruction manuals, new procedures and tools. INSPECTION – Provides Customers with updated inspection procedures or the introduction of new inspections. OTHER – Information content to be defined as needed. Revisions This symbol shows where the document hasbeen revised (“n” n indicates the revision index history).

Nuovo Pignone S.p.A.

Via Felice Matteucci, 2 | 50127 Florence, Italy T: +39 055 423 211 F: +39 055 423 2800 Subject to Proprietary and Confidential restrictions

Page 3/4

SERVICE LETTER
NIC 07.21.SL Rev. 00 July 11, 2007

Attachment TIL 1576

Nuovo Pignone S.p.A.

Via Felice Matteucci, 2 | 50127 Florence, Italy T: +39055 423 211 F: +39 055 423 2800 Subject to Proprietary and Confidential restrictions

Page 4/4

ENERGY SERVICES ENGINEERING PRODUCT SERVICE

TIL 1576
28 JUNE 2007
Compliance Category – S Timing Code - 5

TECHNICAL INFORMATION LETTER
GAS TURBINE ROTOR INSPECTIONS APPLICATION
All frame 3001, 3002, 5001, 5002, E-Class, and FA-class gas turbines.

PURPOSE
Recognizing that all componentsof high technology equipment have a finite life and in efforts to continuously enhance reliability and availability of customer’s gas turbines, GE is further communicating its existing rotor life management recommendations. This life management methodology is similar to the practices employed with GE’s Aviation engines. Upon reaching recommended inspection intervals, compressor and turbine...
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