Second issue. If the a/c is punctured, how on earth do you repair it? Bearing in mind that the repair will need to be good for the remaining life of the a/c.
No Repair,
just put a Korkplug in. Plugs have to be konical and prefered from Red Winebottles older than 60 years. They have to be stored on full bottles just prior to be used. Not that they work better than new ones, but our mechanics insist in the older ones.
Make shure to work them into the hole from the inside of the fuselage, otherwise diff. pressure will push them out again and they donīt last for the whole airframe life.
Inbalance