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  1. chuck8892

    Flow rate of oil into hydraulic valve lifter

    Strange request: I was investigating why some hydraulic lifters I installed in my car were allowing the push rods to pop off. I have since discovered that the two different lifter brands in question had two different hole sizes that allow the oil to enter the lifter. This oil pressurizes the...
  2. chuck8892

    What's the plus symbol (+) on face of avionics equipment?

    Great discussion and inputs! I agree with IRstuff and jmcaero's assessments that there is a connection for backlighting and was attempting to make that point in my last post. I also agree that you wouldn't want a panel to lose its light during operation, but it happens in old, tired Air Force...
  3. chuck8892

    What's the plus symbol (+) on face of avionics equipment?

    Ok, here are the pictures. The first three show components with the "+" of which I spoke: ---this one is below the turn wheel--- ---this one's easy to see--- ---there are actually 3 in this one...top, "ENGA +"; middle, COMM/NAV panel; and left between "H" and "N"--- This next one is the...
  4. chuck8892

    What's the plus symbol (+) on face of avionics equipment?

    Sorry itsmoked, but I don't see any pic posting instructions. Let me know if you have instructions for posting on Eng-Tips Forum.
  5. chuck8892

    What's the plus symbol (+) on face of avionics equipment?

    Well, I have pictures now. I also feel quite confident in a solid explanation I received from a former avionics tech. He said that that is the point where the face plates get their ground so that the lights in that plate can backlight the surface. Seeing how we fly some unusually old...
  6. chuck8892

    What's the plus symbol (+) on face of avionics equipment?

    That's along the lines of what I thought. Been too busy (lazy?) to take the picture. I'll try to get a couple of shots on my next mission. What is the significance of indicating externally where the internal chassis ground is?
  7. chuck8892

    What's the plus symbol (+) on face of avionics equipment?

    I guess it's possible that it is a requirement based upon a MIL-Standard?? Anyone with further insight? I'll try to get a close up picture of a couple of the components and see if I can post those...
  8. chuck8892

    What's the plus symbol (+) on face of avionics equipment?

    I'm a military pilot and a mechanical engineer. I'm trying to find out what the "+" symbol which randomly appears on the surface of almost every avionic component face plate on my aircraft is for. I've been told it was a "grounding" point which I assumed to mean a static discharge point to...
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