bnt83
Final Approach
My original bladders lasted 31 and 36 years respectively. I'm on 19 and 14 years on my current ones with no issues... I have no fear of bladders and am glad I have them.
That is pretty good. The sealant in my 177 wet wings is somewhere between 52 ad 53 years old, guaranteed it doesn't leak. It has mogas in it and that stuff smells so bad you know almost immediately if something is leaking.
I dread the day they start leaking because access into the fuel tank sucks. I may need some approvals to add some access panels... Almost every jet built today has an access panel between every rib in the wing, this 177 was built with one lone panel in the middle of three bays.
I think service life of fuel tanks is probably most affected by environment, the 177 rarely sits outside in the sun. I can't imagine bladders would last 30 years tied down in Arizona.