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IO 520 momentarily loses power

Periodic ( once every few hours), but now more frequently (at least once during the past 3-4 flights), the right engine (IO520) loses power. This has been going on for 2 months. It can be from a barely perceptible fraction of a second to half a second where there is a noticeable yaw. My mechanic insists there is water trapped in a crease in a bladder. That made sense the first couple of times but this has persisted. It usually happens so fast I don't see the JPI engine monitor. But, one time I did see all the CHT's drop off for that short period (less than 1 second). ?

Model: Baron E55
Aircraft Serial Number: TE 1104
Posted 11/28/2022 - 1 year ago
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Water will not go through the fuel strainer in the gear well without leaving a tracer, have you drained that after experiencing this? Any chance your JPI recording is set for the fastest sample rate (I think 1-sec intervals) and you recorded it and can share?

Mike
ABS Tech Advisor

Posted 11/28/2022 - 1 year ago
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Thank you for the reply Mike. No on both. I'll ask my mechanic to drain the strainer and see if I can download the JPI data (I have no idea what the sample rate is set at). Would water be your first thought or could it be something in the fuel controller? Be advised mechanical issues are not my forte! - Wayne

Posted 11/29/2022 - 1 year ago
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Water would be a reasonable guess, but generally easy to confirm. Suggest that you add checking fuel sumps to your preflight inspection procedure.

Posted 11/29/2022 - 1 year ago
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Sumping is routine; so far no water seen.

Posted 11/29/2022 - 1 year ago
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IO 520 momentarily loses power