S.I.L NO. GEN-055R4 SERVICE INFORMATION LETTER

1 INFORMATION LETTERThis SERVICE INFORMATION LETTER is valid for one year from date of : July 18th, 2011 Page1 PRATT & WHITNEY CANADA , LONGUEUILQUEBEC, CANADA J4G 1A1 PRINTED IN CANADAS ubject:Guidelines and Standards forSubscribingandUtilizing the Internet-basedEngine Condition Trend MonitoringWebECTM ServicesApplicability:All Engine ModelsThisSILexplains the benefits ofconductinganEngine Condition Trend Monitoring(ECTM) program,presents the features of WebECTM Services andprovidesinformationon how to subscribe to revision4announces the transition of ourECTM services from P&WCtoCAMP SystemsInternational (CAMP) andthe migration,for added clarity,ofall technical INFORMATION contained in priorrevisionsto this SIL tothe applicable Engine Maintenance Manual(EMM)or SERVICE Bulletin(SB).Definitions ECTM is a process in which changes in certain performance parameters of an engineare analyzedon a regular basis. This is done to helpprovideearlydetection ofengine performance deteriorationdueto wear ormalfunction of engine components and accessoriesin order to minimize unplanneddowntimeand maintenance costs.

2 WebECTM Services is the soleECTM systemrecommended for P&WC engines in accordancewith the system uses proprietary equationswhichoptimizedetection of shifts in engine integralWebECTM Services module isalsoavailablewith the other system iscurrentlyrecommended by P&WCforthisanalysis, includingpreviousversions oflocalECTM SystemIV,ECTM SystemV and HECTMS ystem note that these programshave not been supported or updated by P&WC since 2004. Designated AnalysisCenters(DAC s) offerprofessionally trained techniciansandexpert analysisof ECTM data, regular updates on the status of your engineskey parametersand anywhere-anytimeaccess to your data via data management systems TurbineTracker and WebECTM .For theanalysis of ECTM data, operators may contact any of the Designated Analysis Centers (DACs) listed inAppendix A .Aprofessional analystwill beable toproperlyinterprettrend signature characteristicsand suggestremedial actionforthe following anomalies: premature hot section deterioration, hot start, faulty fuelsystem, Foreign Object Damage (FOD), bleedairleaks, instrumentation errors and feedback will be realized when the data is inputted,processedand analyzed on afrequent and regular & WHITNEY CANADASERVICE INFORMATION LETTERGEN-055R4 This SERVICE INFORMATION LETTER is valid for one year from date of : July 18th, 2011 Page2 PRATT & WHITNEY CANADA , LONGUEUILQUEBEC, CANADA J4G 1A1 PRINTED IN CANADAA lternatively, an operator with in-house expertise may analyze his own subscribe to the basicWebECTM Services, please Systems International (CAMP).

3 On January1st 2011,P&WCenteredinto acollaborativeagreement with agreement,CAMP isnowresponsibleforthemanagement of theDesignated AnalysisCentre(DAC)Networkas well asprovidingtechnical supportanddata analysisservicesto operators previously supported by the P&WC DAC,includingP& expertise and knowledgein web-based services technologywill benefit to thefuturedevelopment of theirWebECTM P&WC DAC will nolonger be in operation and all operations and historical data will be seamlesslytransitioned to of theircurrentcontractterm,customers of the P&WC DAC will becontacted by considerations and technicalrecommendationsThe technical recommendations described in prior revisions to this SILwill be incorporatedinanupcomingrevision of SB or EMM(05-20-00, 71-00-00, 72-00-00),as topics, whichcanbe found in Appendix B and C ,continue tobevaliduntilthecontentmigratesto the applicableEMM:Web-based ECTM ProgramData Acquisition In flight, Automatic, ManualData Entry,Normalizationand Comparison to Mathematical ModelsBenefitsof an ECTM ProgramThe intent of thefollowing technicalrecommendations willbe incorporated in theappropriatesection oftheapplicableEMMorSB.

4 Content previouslyfound in prior revisions ofthis SIL is moved to Appendix C and will become obsolete when reference to this SIL is removed from the EMM or ECTM Guidelines and Standards for engines using ECTM to establish the & WHITNEY CANADASERVICE INFORMATION LETTERGEN-055R4 This SERVICE INFORMATION LETTER is valid for one year from date of : July 18th, 2011 Page3 PRATT & WHITNEY CANADA , LONGUEUILQUEBEC, CANADA J4G 1A1 PRINTED IN CANADAW here to Obtain Additional InformationIf you have any questions regarding this SIL or any other topic, please contact P&WC asfollows:1. P&WC Customer First CentreUS & Canada 1-800-268-8000 International1-450-647-80002. Your local P&WC Field SERVICE RepresentativeIf you have any questions regardingECTM services, please contactCAMPas follows:CAMP Systems InternationalUS & Canada 1-855-WEB-ECTM (932-3286)International: more INFORMATION on our products, we welcome you to visit our P&WC s Website ( ).Yourstruly,PRATT & WHITNEY CANADA DuboisDiagnostic, Prognostic & Health Management (DPHM)PRATT & WHITNEY CANADASERVICE INFORMATION LETTERGEN-055R4 This SERVICE INFORMATION LETTER is valid for one year from date of : July 18th, 2011 Page4 PRATT & WHITNEY CANADA , LONGUEUILQUEBEC, CANADA J4G 1A1 PRINTED IN CANADAA ppendix AList of Designated Analysis Centers (DAC)CAMPS ystems International, boul.

5 Roland-Therrien, suite 140 Longueuil (Quebec)Canada J4H 4A6 Phone:US & Canada 1-855-WEB-ECTM (932-3286)International: (450) 640-3286 Fax:(316) (Danish Engine Trend Analyzing)Aaholmvej 22DK-9870 SindalDenmarkPhone: +45 9678 2000 Fax:+45 9678 SECA1 Boulevard du 19mars 196295503 Gonesse CedexFrancePhone: +33 1 3018 5303E-mail: Trend Box 642 Clovis, CA 93613-9988 USAI nside US&CanadaPhone:(800) 297-6490 Outside US&CanadaPhone:(559) 297-6490 Fax (inside/outside):(559) previously with the P&WC DAC are now being serviced by & WHITNEY CANADASERVICE INFORMATION LETTERGEN-055R4 This SERVICE INFORMATION LETTER is valid for one year from date of : July 18th, 2011 Page5 PRATT & WHITNEY CANADA , LONGUEUILQUEBEC, CANADA J4G 1A1 PRINTED IN CANADAA ppendix BNote: The following informationremains validuntil it is migrated to theappropriate section of ECTMB enefits of an ECTM Program:EconomicsIf performed per P&WC instructions, ECTM may assist in maximizing flying timewhile minimizing unplanned downtime, delays and cancellations.

6 Monitoring ofthe engine condition in conjunction with EMM periodic inspection requirementshelps the operator to address problems before they havea significant impact onoperating trend monitoring of hot section condition and available performancemargins in conjunction withEMMperiodic inspection requirements providesadditional INFORMATION for the schedulingof repairs and Hot Section Inspection(HSI).ReducedMaintenance TimeECTM can reduce troubleshooting time by directing the technician to thegeneral area of the engine requiring attention. Performance recoverymeasurement versus performed maintenance( compressor wash) helpsidentification of the most effective line maintenance practices for PerformanceAssessmentECTM used in conjunction with engine calibration and performance check (5-point calibration) data, provides an additional means of assessing ECTM SystemAn effective Web-Based ECTM program consists of five data acquisition (manual or automatic), entry, normalization and comparison to mathematical models, analysis for detection of anomalies (alerts),PRATT & WHITNEY CANADASERVICE INFORMATION LETTERGEN-055R4 This SERVICE INFORMATION LETTER is valid for one year from date of.

7 July 18th, 2011 Page6 PRATT & WHITNEY CANADA , LONGUEUILQUEBEC, CANADA J4G 1A1 PRINTED IN management and follow-up hardware and software with internet WebECTM requirements for engines using ECTM to establish HSI frequency are presented inparagraph Specific ECTM Guidelines and Standards for engines using ECTM to establish the requiredHSIfrequency , the applicable SB or respective EMM (05-20-00, 71-00-00, 72-00-00, as applicable).In-Flight Data AcquisitionThe process to record accurate ECTM data can be located in the General Principles and Interpretationsection of theWebECTM Services application on-line are essentially two differentsystems for data acquisition, manual and automated, with the following general use of compatible automated data acquisition and transmission hardware availablethrough P&WC. This equipment can significantly improve predictive capability by enhancing theregularity and consistency in data recording which may not be the case whenundertaken manually dueto various engine load effectiveness of an ECTM Monitoring program is dependant on the quality of data on consistent and reliable engine performance data that includesambient parameters; outsideair temperature (OAT), altitude ( ), aircraft speed (IAS) and engine performance data; torque(TQ), engine compressor and propeller (if applicable) speeds (NP/N1, NL/NH/NG/N2), turbine gastemperature (ITT) and fuel flow (WF).

8 It is imperative that the required data is acquired at consistentaircraft operating parametersPeople involved in the recording, entry and appraisal of trend data are required to be adequatelytrained. This also applies to the pilots, if the recording system is not Data AcquisitionP&WC promotes the use of automatic data acquisition system. Engine performance data is capturedautomatically by an acquisition system when the required stable conditions are met. When usingautomatic data acquisition equipment: The correct configuration of the automatic data acquisition unit for specific aircraft/enginecombination is critical for the data capture. There should be clear procedures established by theoperatorand adequate training to ensure that the automaticdata acquisition systemconfiguration is carried out during replacement of the acquisition unit and during an enginechange. There should be a procedure to ensure that self/functional tests and maintenance of theautomatic data acquisition unit is carriedout per the manufacturer s & WHITNEY CANADASERVICE INFORMATION LETTERGEN-055R4 This SERVICE INFORMATION LETTER is valid for one year from date of : July 18th, 2011 Page7 PRATT & WHITNEY CANADA , LONGUEUILQUEBEC, CANADA J4G 1A1 PRINTED IN CANADA The method and the schedule for the transfer of data from the acquisition unit using acceptablemethods are to be specified.

9 There should be clear procedures to ensure that once data is acquired that it is sent promptlyfor data certain aircraft applications there may be certain engine parameters which are not visible on theinstrumentation panel ( NL speed) which can only be acquired with an automatic recorder. In suchcases, P&WC recommends the usage of automated data acquisition and transmission hardware tocapture and monitor the non-visible parameters. It must be noted however that if an automaticrecording device is temporarily out of SERVICE , operators must continue to record the engine Data acquisitionUsing manual data acquisition, the required data is collected by the flight crew under stabilized cruiseconditions and entered on a form dedicated for WebECTM . The following are significant elements ofthis datacollection arrangement: There should be clear instructions to the flight crew regarding the flight phase and the aircraftconfiguration under which data are to be collected.

10 This includes bleeds on/off condition, cabinair recirculation on/off condition,hydraulics and anti-ice settings, as well as some guidelines onthe desirable altitude at which data is to be collected. The WebECTM computer programcorrects the data for altitude, however it cannot account for the different bleed loads at differentaltitudes. For pressurized aircraft, data collection above 10,000 feet should minimize datavariability due to bleed loads. The engine(s) should be stable without throttle movement for at least 5 minutes prior torecording the actual mission (preferably the first or last flight of the day) may have tobe modified to meet this requirement. The actual flight readings should be recorded and not the target values. It doesn't matter if theengines power indications are mismatch. If the data set is consistent,WebECTM willnormalize accurately. One data set per day of flying is considered adequate. The engine parameters should berecorded first without interruption.