I’m happy to see the topic of trend monitoring show up in this forum. I have already responded directly to the originator of this post regarding the specifics about our service, but I would like to offer some clarification about trend monitoring in general.
It’s true you have the option of subscribing directly to PWC’s trend monitoring program, WebECTM. However, by doing so you are then taking on the responsibility and liability for performing the analysis of the trend monitoring graphs. According to the PWC Service Information Letter regarding WebECTM (PWC SIL No. PT6A-122), this option is intended for self-sufficient operators with in-house trend data analysis expertise. The SIL also states a professionally trained technician is required to properly assess shifts in trend and recommend remedial action. While Pratt & Whitney Canada personnel may provide occasional graph review at your request they do not review your data each time it is uploaded. Nor does Pratt & Whitney Canada provide routine analysis or maintenance recommendations.
Pratt & Whitney Canada (PWC) has established a network of 4 Designated Analysis Centers (DAC) worldwide which are authorized to provide trend monitoring on a commercial basis. In addition to minimum staffing levels, recurrent training, and insurance requirements, PWC also requires the DAC’s to use the WebECTM program to perform the analysis and provide maintenance recommendations to the operator when the trend monitoring graph warrants corrective action.
The primary reason a PT6 operator should be on a trend monitoring program is to catch small problems before they evolve into large costly problems. In our experience the most common problem we come across is indication errors with the ITT and Torque. While this may seem like a minor discrepancy, keep in mind that in the JetProp you generally setup in cruise to a predefined ITT value. So if the ITT is falsely indicating low 20 degrees, you may be running your engine 20 degrees hotter than you think you are. How much added deterioration is this contributing to after 25, 100, or even 500 hours of operation?
In the 16 years we have been in business, we have issued over 15,000 alerts to operators of all types of turbine engines. We have extensive history showing that when done properly, trend monitoring can prove to be a very beneficial tool in reducing the cost of operation.
I would be happy to discuss any questions or concerns about trend monitoring with anyone who is interested.
The Trend Group
Ph (800) 297-6490