Nc97 Posted September 16, 2009 Share Posted September 16, 2009 Has anyone ever heard of an engine inlet ice detector fracturing and Fodding out an engine? I recently spoke with an engineer at Mack Electronics and he mentioned that the older 575-315’s were renowned for this; we talking hundreds of T-56’s. I also understand that the 575-315’s have been replaced by the Lockheed approved 092-000-001’s. Was there ever an Air Force TCTO to check for these 575-315’s and remove them from service? Quote Link to comment Share on other sites More sharing options...
ArcticFox Posted September 22, 2009 Share Posted September 22, 2009 Heres what I know, it may or may no be related. There was an original Lockheed Ice detector that was used for some time, then a fancy solid state version came bout. There were some problems with the Solid state versions (not sure what the extent of the problem was - reliability was a factor I am told). Lockheed went back to the older style (shiny) ice detectors, (the solid state where painted black). Have not been around the Herc world long enough to have heard all the stories, although I'm sure I'll spend the rest of my life in this world in one way or another, and I'm sure I'll never hear them all. -Fox Quote Link to comment Share on other sites More sharing options...
ArcticFox Posted September 22, 2009 Share Posted September 22, 2009 Ice Detectors came up in conversation today which prompted me to ask about this, I was told the company that made them went out of business which is why the AF switched back to the old ones. I Have seen both types but never looked to see who the Mfg. was - so I can't verify that. (my guess is there are a lot of "reasons" floating around as to why we switched to the other Ice Detector). I know this is a pretty trivial matter as the only difference between the two that made any difference in the operation was holding that ice detector test switch for two long could damage the solid state version. (not sure why you would hold that switch for more than a second anyway.) Quote Link to comment Share on other sites More sharing options...
Dutch Posted September 22, 2009 Share Posted September 22, 2009 No ice deice time delay relay inop. Carried this write up for a bout 6 months on a A model back in 1964/65. Quote Link to comment Share on other sites More sharing options...
ArcticFox Posted September 23, 2009 Share Posted September 23, 2009 The only two types of ice detectors i'm familiar with are: The old school one (which im told we've gone back to using) Diaphlex "Detector, Ice air intake duct aircraft, gas turbine engine (probe assembly)" part # 575-315 Then there was the solid state fancy one- Dataproducts New England, "detector, ice detector system" model: 6316-5 part # 93161000-001 Quote Link to comment Share on other sites More sharing options...
SergF Posted September 23, 2009 Share Posted September 23, 2009 (edited) What I was taught in advanced systems was that the old ones were an element type that would overheat or something similar, and what ever melted exited the detector and entered the compressor like little ball bearings. I don't know the extent of that damage that occured. Like I said, I learned this in FTD, sooo.... I would research it more. You can contact the instructors at the Rolls Royce school. I'm sure they will know. I'll get you the e-mails when I get back from work. Edited September 23, 2009 by SergF Added more info Quote Link to comment Share on other sites More sharing options...
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