Does anyone have details about the Galvanic Interaction between Aluminum and carbon fiber in a wet environment?

Hi Peter,

The article from Olympusmons is a great read and informs you how the corrosion occurs.  But what we need to understand is, what was the root cause?  Was it an internal arcing fault, due to wear with the cables in the conduit?  Or, as you are aware, toilets can be a highly corrosive environment, due to the corrosive fluids used, whether that be human or cleaning fluids.  Was there a leak into the conduit?  Hopefully, at least, the FAA has only found the issue in this one area on this aircraft type.  Do you know how many occurrences there has been?  Is there any similar issues on other Boeing ac?  Does Boeing manage a RCM log or conduct Fail Mode Effect Analysis?  

I hope you are able to find the root cause and rectify the problem.

John

Hello John:

The published FAA notice does not state if it was a mistake by Boeing during the planes assembly.

The notice just defines what periodic maintenance inspections must be done to find the problem.

 Peter Brooks

Palm Bay FL

Hello John.

I thought you might be interested in another Boeing 737 material fatigue problem associated with the Lavatory. The FAA issued an alert on April 11 2025 concerning the plastic latch used in the bi-fold door.

A person was trapped inside the Lavatory and the flight had to diverted to another airport to allow them to extract him or her.

The root cause was excessive stress due to the drilling/machining of the holes in the plastic.

Peter

Just adding a link to further info for you Peter as this one piqued my interest! :) 

https://simpleflying.com/faa-replacement-faulty-boeing-737-lavatory-door-latch-trapped-passenger/

Just adding a link to further info for you Peter as this one piqued my interest! :) 

https://simpleflying.com/faa-replacement-faulty-boeing-737-lavatory-door-latch-trapped-passenger/