barry
New Member
Director of Maintenance
Posts: 6
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Post by barry on Jun 5, 2023 17:30:39 GMT
Does anyone know if the fuel quantity senders are float type or the capacitance type.
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Post by technammech on Jun 8, 2023 15:06:45 GMT
Does anyone know if the fuel quantity senders are float type or the capacitance type. They are a float type. Do you have one that fluctuates on indication? They stupid expensive. |
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barry
New Member
Director of Maintenance
Posts: 6
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Post by barry on Jun 9, 2023 8:59:01 GMT
Yes, but I think it may just be a characteristic of the system. Now knowing it’s a float gives me a better idea of what’s going on. With 5 gallons in tank, and aircraft still, it reads correctly. With any sort of movement, the sloshing allows the float to obviously bottom out, sending an erroneously low indication, as in indicating less than zero.
The flight crew thought they had a problem, but I was pretty sure it was just because they ran it so low, and the sensor was reaching the bottom of its range when fuel sloshed around. I know capacitive type sensors can be affected by moisture or other even small contaminants that might short them.
I’ve not yet priced them.
Thanks.
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Post by technammech on Jul 5, 2023 12:56:54 GMT
We just replaced a sender. I will post you a pic of it.
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Post by nohippychicks on Nov 12, 2023 4:59:51 GMT
No pictures yet?
I've been having some issues that mirror this post and each unit has been sent back to the MFG with a report of "No discrepancies found," despite the fact that installing a new sender has corrected the problem.
Intermittent issues are fun!
Could it be wiring?
Could it be avionics?
Could it be an inherent fault in the sending units?
Could it be corrosion in a place Maintenance hasn't found?
Who knows!
What a cool game!
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Post by technammech on Nov 13, 2023 15:22:27 GMT
No pictures yet? I've been having some issues that mirror this post and each unit has been sent back to the MFG with a report of "No discrepancies found," despite the fact that installing a new sender has corrected the problem. Intermittent issues are fun! Could it be wiring? Could it be avionics? Could it be an inherent fault in the sending units? Could it be corrosion in a place Maintenance hasn't found? Who knows! What a cool game! Found that corrosion for the ground has been causing us problems after a sender change and did purchase a gauge. I have coated the inside of the sender with DC4 to try and ward off moisture under the cap. |
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Post by nohippychicks on Dec 8, 2023 1:31:25 GMT
Sorry for the late reply.
Good find! I've seen '06s and '10s that have not had the little cap over the sending units sealed well from the factory. I'll pull those off at annual (or when there's a squawk) and look inside and find water pooling. I'm starting to think I should remove those caps every couple 100 hour inspections instead of waiting for problems or annuals, though.
Did you find standing water in there or just corrosion? How bad was it?
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Post by technammech on Dec 8, 2023 14:39:38 GMT
Sorry for the late reply. Good find! I've seen '06s and '10s that have not had the little cap over the sending units sealed well from the factory. I'll pull those off at annual (or when there's a squawk) and look inside and find water pooling. I'm starting to think I should remove those caps every couple 100 hour inspections instead of waiting for problems or annuals, though. Did you find standing water in there or just corrosion? How bad was it? Found water / Moisture inside. It was the ground that was making it act up. Cleaned everything well. New ground screw and I coated the inside with DC4. So far so good. |
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