Emb-145 chip detect

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03-29-2017, 07:36 AM

Dirty bird

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Emb-145 chip detect

Hi all,
I have zero time on the emb145, and need help for a friend. Does the aircraft give a chip detect cas msg? Or just only a oil filter bypass msg. Please feel free to move this post.

03-29-2017, 07:52 AM

NeverHome

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Quote:

Originally Posted by Dirty bird

Hi all,
I have zero time on the emb145, and need help for a friend. Does the aircraft give a chip detect cas msg? Or just only a oil filter bypass msg. Please feel free to move this post.

On our birds we should not get a chip det msg. If that were to occur it would be logged in the cntral maint computer (cmc). Looking at the system diagram it does not appear that you would even get a bypass at all. I count 4 chip detects with four sumps. So you would only get the chip detect in the cmc if one of those picked up debris.

I guess the logic is, a little debris is not worth alerting the crew. If there is alot of debris perhaps there is a major malfunction that will manifest itself in other places.

Hope this helps

03-29-2017, 11:53 AM

trip

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I remember the E120 had a couple press-to-test chip lights in the nose compartment. These could be easily pressed by a curious pilot on a walk around. When planes started getting written up in BFE the company put out a memo, stop pushing those chip lights, it's maintenance function.

03-30-2017, 12:19 AM

reservetank

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The E145 has chip collectors but not detectors. There is an EICAS advisory message for impending bypass of the oil filter. Pressure differential across the oil filter due to blockage causes it.

03-30-2017, 04:28 AM

NeverHome

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Quote:

Originally Posted by reservetank

The E145 has chip collectors but not detectors. There is an EICAS advisory message for impending bypass of the oil filter. Pressure differential across the oil filter due to blockage causes it.

Hmmm interesting. I went to reread my manual after what you said. The interesting part is that in the textual part of the lubricating scavage system it says chip collector, yet on the diagram it says chip detector in my manual. Translation error? Take a look! I would be curious if your manual has the same diagram

03-30-2017, 09:20 AM

N19906

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Ok, I don't know your airplane, but I've got a lot of maintenance experience. They are essentially the same thing. Ever seen a magnetic drain plug? If you can insulate the magnet from the rest of the plug, when enough debris collects on the magnet to touch the rest of the plug, you have a ground path. Run a wire to it and you can have a chip detector light.

03-30-2017, 09:37 AM

NeverHome

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Quote:

Originally Posted by N19906

Well if they are the same than I have learned something new! I could be wrong though, but I thought when metal debris landed on the detctor than it interrupted the field and caused a change (like an electric guitar pickup).

Good info though

03-30-2017, 11:20 AM

N19906

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I can see that working as well, (that's a bit more complicated). Either would still use a magnet to catch debris. It's a design question for setting the threshold you'd want the light/message to alert at, (and to whom). Wander into the engine shop some day and ask, if you get the chance. We wouldn't get many pilots stopping by, but we didn't mind answering questions.