Southern California EdisonOctober 23, 2015
I previewed your digital TOT Indicators with exceedance monitoring at the HAI Convention in Anaheim in 1994 and was impressed with what I saw as a solution to our premature turbine removal and temperature monitoring on our four McDonnell Douglas 500 helicopters.
After further conversation with your company and Roy Wiley of Civic Helicopters (distributor for the West Coast area), we purchased three indicators. The installation was initially field approved; and was then made available to assist Roy Wiley in the development on the STC.
We installed our first gauge in May 1995, and they have been totally trouble-free. Our previous two-year history was four premature turbine removals for low power that subsequently showed signs of heat distress with an associated cost of approximately $135,000. Since installation of your indicators in three of our aircraft, we have had only one premature turbine removal, which was due to a known operational exceedance.
Flight crews were initially apprehensive about the monitoring built in to the instruments, but soon started to rely on the accuracy and precision with which they can adjust power to meet the job requirement. Engine power checks and monitoring are more precise due to the accuracy of your indicators. The addition of the remote mounted indicator light provides an additional indication that can be monitored during external load operations.
I would highly recommend the replacement TOT Indicators to any operators that want to lower their DOC’s and more accurately monitor their engine performance. We are anticipating the TSO of your digital Torque Gauge replacement, and feel this will complete a highly accurate health monitoring system for our engines.