What was found
(CAN) THE OPERATOR AND CUSTOMER SUPPORT REPORTED THAT THE AIRCRAFT, WHILE SCOOPING WATER, BOTH WATER TANK DOORS OPENED WITHOUT LOSING THEM . THE ACFT LANDED ON WATER UNEVENTFULLY. A POST-ACCIDENT INSPECTION REVEALED THAT MAJOR STRUCTURAL DAMAGE TO THE WATER TANK STRUCTURE. NO ONE WAS INJURED AS A RESULT OF THIS ACCIDENT. THE ACCIDENT OCCURRED ON THE 2ND MISSION AND SECOND SCOOP. THE FIRST MISSION MADE 7 WATER DROPS. THIS IS THE 3RD ACCIDENT INVOLVING WATER TANK DOOR SEPARATION DURING WATER SCOOPING.