Working on a 1958 C180 floatplane now.
No logbook records (goes back to mid 60's) to show that it has ever been on wheels.
Cracks found on bulkhead STA 90 above the rear float fittings ... above the floor.
The right side is cracked.
The left side by the lower baggage door hinge beyond cracking ... its broke
Looking for information on bulkhead doublers and repair.
Thanks

Ouch... I'm pretty sure you will have to replace the entire bulkhead, which means pulling the floor. Not a fun project for sure. How about some pics? Keep us posted...

Perhaps I overstated the left side by the lower baggage door hinge ...
Not really broke through the the bulkhead, but certainly cracked.
Thinking there must be a doubler repair out there somewhere.
Hope do ...
Changing the entire bulkhead seems extreme.
Thanks ...

Cessna structural repair manual does show some typical repairs to bulkheads and frames, I would start there. Also AC43.13 is an excellent source for doubler designs.

As Big Renna suggests a picture is worth a lot in situations like this. If you have a smartphone the Tapatalk app makes posting pictures very easy.

I second what Halestorm posted. These are not the first bulkhead cracks needing repairs on Cessnas. Under no circumstances would I replace the bulkhead and in fact repairing the crack is the recommendation of Cessna. Splitting the airplane to replace the bulkhead without a jig to maintain alignment of the fuselage carries the risk of the airplane flying crooked. If large areas of the bulkhead where corroded then it would justify the replacement. If required to gain adequate access to the underfloor area to do a quality repair keep in mind that you would probably be able to only remove the rivets in the baggage area and part way forward and roll the floor skin upward to get it out of the way. Use care not to over bend.

Though the internet is a good source of information, in the 38 years you have owned and flown your 180 you have meant the people, even if they are now retired, who know how to do this repair and make sure it will not happen again. Ask around.

Tim A&P IA