What was found
FUEL LEAKING INTO THE AIRCRAFT CABIN FROM THE AIRCRAFT CENTER TANK DUE TO IMPROPER INTERNAL AND EXTERNAL SEALING AT MANUFACTURE. THE FUEL TANK FASTENERS APPEAR TO HAVE BEEN INSTALLED WITHOUT ADEQUATE SEALING. RECOMMEND ACO NOTIFICATION AS THIS HAS BEEN AN HISTORICAL PROBLEM WITH THE ASTRA SPX. CONDITIONS SUGGEST THAT THE SEALANT MATERIAL IS EFFECTIVE, HOWEVER, THERE APPEARS TO BE A PROBLEM IN THE APPLICATION OF THE SEALANT AND QUALITY CONTROL. THE FUEL TANK SEALANT WAS REMOVED, THE AREA CLEANED, AND RESEALED.