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Old 11-25-2020, 09:32 AM
tthrew tthrew is offline
Join Date: Jan 2015
Location: Peoria, IL
Posts: 83
Default EarthX, W&B change, Logbook Entry, Phase 1?

Hello VAF - I have a question. When a person changes from an Odyssey PC680 to an EarthX battery, there is a W&B change. Based on my reading, I'm thinking this is considered a minor change, (no need to contact FSDO)? I believe all one needs to do is update the plane's W&B and make a logbook entry. Maybe a person should put the plane back into phase 1 himself, do some flight testing for 5 hours? Or, am I overthinking this? Thank you for your input.
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Old 11-25-2020, 09:46 AM
Scott Hersha Scott Hersha is offline
Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 1,707

My operating limitations mentions a new phase 1 when there is a major change, including W&B. I put a light weight prop on the nose of my RV4 and lost 20 lbs (I did re-weigh the airplane). I discussed this with my local FSDO. He wasn’t sure if it constituted “major change” - my empty CG moved aft about .5” - but he recommended and authorized a 5 hour phase 1. Helps solve any possible insurance concerns as well. It doesn’t seem like yours would be a major change. It doesn’t seem like your CG would have moved much, and operationally it should be the same as before, with a possible new abnormal procedure to be aware of and followed (checklist item).
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Old 11-25-2020, 10:20 AM
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DanH DanH is offline
Join Date: Oct 2005
Location: 08A
Posts: 9,719

Tim, like Scott's FSDO inspector, I'm not sure there is any hard list of major vs minor.

Strictly opinion, but I'd call W&B minor, because in theory we should re-weigh (or simply recalculate based on old vs new component weight x arm) following every component addition or removal. I can't imagine FSDO folks want to answer approval letters for avionics changes. Consider all the ADS-B stuff added in the last three years.

Plus W&B is assumed to be within the capabilities of any qualified pilot.
Dan Horton
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Old 11-26-2020, 01:21 PM
calpilot calpilot is offline
Join Date: Aug 2018
Location: Independence
Posts: 69

Read your Operating Limitations. Most likely, it is a minor change, just a maintenance record entry and an updated weight and balance.

DAR Gary
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Old 11-30-2020, 10:46 AM
tthrew tthrew is offline
Join Date: Jan 2015
Location: Peoria, IL
Posts: 83
Default Thank you

Scott, Dan, Gary - Thank you for the responses. I thought is was a minor (not major) change, too. I'm not the builder, still learning and wanted some assurance. And I also thought this thread might be informative to others with the same question.
Scott - I added the BMS "blinky light" fault codes to my POH, but didn't think about updating my checklists, thank you.
Dan - your comparison to W&B changes from avionics upgrade, being a minor change was good. I also found a VAF thread discussing painting the plane and how that W&B change was also not a major change. That thread was informative and related to this discussion.
Gary - I'm glad a DAR posted his opinion. Thank you. Yes, I did read my Op Limits; that is where I started. As, you suggested, I did a log book entry, and updated my W&B.
Thank you again for your responses, and Doug for hosting this site - you all have happy and safe holidays.
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