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Cf34 guide JET-CARE INTERNATIONAL INC Saddle Road Cedar Knolls NJ USA t f e enquiries jet-care com w www jet- care com JET-CARE Palace Gate Odiham Hampshire RG NP UK t f e enquiries jet-care com w www jet-care com Keep it ying CF ENGINE TRENDING GUIDE ? P

JET-CARE INTERNATIONAL INC Saddle Road Cedar Knolls NJ USA t f e enquiries jet-care com w www jet- care com JET-CARE Palace Gate Odiham Hampshire RG NP UK t f e enquiries jet-care com w www jet-care com Keep it ying CF ENGINE TRENDING GUIDE ? Palace International Ltd All rights reserved CA practical guide to the Jet-Care CF Engine Condition Trend Monitoring service Engine Condition Trend Monitoring ECTM Gas Path Analysis GPA Bene ?ts of Gas Path Analysis How to trend Enrolment Data Collection Manual Data Electronic Data Reporting ECHO PDF Reports Trend Status Enrolment Form Trend Monitoring Form Terms and Conditions enclosure enclosure enclosure C Jet-Care CF Engine Trending PDF Reports The ?rst page of the PDF report is the Trend Data This is the raw data supplied by the operator and is listed in date sequence All dates are in format dd-mm-yyyy Please check the aircraft registration serial number and engine numbers to ensure our information is correct The next two pages show the Smoothed Trend Plots These are the graphical representation of the three main engine performance parameters i e N ITT Fuel Flow Once the data is normalised to standard conditions therefore eliminating the e ?ects of external variation the plots are produced by calculating the deviation from the model performance curve The model performance curve has been established for a notional engine having the same power curve as the type of engine being monitored but has been derived so that an engine with nominal performance will plot with an ITT margin of C and an N margin of From this it follows that as the plots approach these limits it is an indication that the operating margins are reduced and eventually hot day operation may be restricted Most engines will vary in some small part from the notional engine It therefore follows that the values shown on the plot should not be taken as absolute values but as a good indication of the value To enable the plot to be used for absolute values it is necessary to position accurately the plot on the scale by using the declared ITT and N margins from a fully instrumented installed ground run for each particular engine If available please send details of the N and ITT installed margin to enable future trends to indicate the current margins Detailed examination of the relative movement of the trends can give information on the general health of the engine and highlight incipient problems with the engine and the instrumentation where the trends are derived from manually collected data The plots are smoothed by taking a rolling selective average over the last readings to reduce uctuations due to unavoidable data collection variations This means that any sudden change in engine condition will show on the trend in four incremental steps At the bottom of the page the last points are also shown without smoothing This is a further aid to identifying sudden changes This explanation is given for the general