It seems there are 2 issues involved with the 182 bladder system.
1. Rain water entering through the original, flush “ Killer Caps”.
2. Contamination introduced into the system when fueling with
cans or other non- filtered systems.
The AD only addresses the former.
When mo- gas first arrived on the scene folks were eager to save money.
Many systems were developed to enable this.
Some were not so good.
A classic was the 100 gal (?) home heating oil tank .
They must have cleaned it with a gallon of some solvent.
Oil that was trapped in seams was loosened by the mo-gas.
It arrived at the carb with a load of skydivers over the city!
Sumps had been checked before flight but wrinkles in the bladder prevented
the contamination from reaching the drain point.
Another 182 went down on a railroad track after the second take-off of the day.
Sumps were only checked prior to first takeoff.
Maneuvering in flight works water around the wrinkles and to the tank outlet.
The preflight “ Wing Shake” accomplishes the same but allows it to be
drained at the sump.
