Pitot,static check

When you have a pitot/static check performed on your Fouga, be sure that the person doing the static check is connecting the test bench on the static ports on the aircraft.
The reason is that I was working on a Fouga that did not flew for a couple of years, the person doing the static test did not have the special adaptors for the fouga static port, so tested from a hose disconnected after the static ports.
Test was ok, but when we was close to do the test flight, pressurising the cabin, instruments was acting strangely.
The reason was that 3 of the static ports was totaly plugged, and the last one very close.
So next static test, perform it with the adaptors on the static ports.