IMS issue - What Years?

[Jaxonalden]

Originally Posted by harryrcb

What device Jake? Is it on your web site? If it works the price (1/10th of retrofit) would certainly be enought insentive for everyone to jump on it.

Harry,

My guess is that Jake is patenting some kind of vibration indicating system. On some aircraft engines they have an EVI (engine vibration indicator) gauge that reads in mils. I did some research, the following text is extracted from Boeing Airliner magazine, OCT-DEC 1987 issue;

Two types of vibration pickups have been used on Boeing airplanes, the electromechanical velocity pickup and the piezoelectric accelerometer. Signals from velocity pickups are converted into vibration displacement, measured in 1/1000 of an inch, peak to peak (mils double amplitude). These units represent the physical displacement of the vibration sensor. Signals from accelerometers are converted into velocity, measured in inches per second (ips). These units represent the peak amplitude of the velocity of the vibration sensor.. . Boeing airplanes typically use a 0-5 scale for cockpit display of vibration. On earlier applications, the scale provides an indication of absolute vibration units(ips or mils da).

It'll be interesting to see what disclaimer Jake comes with it. I can't see if someone buys one, installs it and their engine hand grenades that Jake will be responsible if the EVI doesn't detect the IMS going south in time to save the engine. Unless, it's hooked into the ignition system and it shuts down the engine at a predetermined vibration reading, before catastrophic failure? Could be interesting.