What was found
FUEL CELLS CRACKING INTERNALLY IF TANKS ARE NOT TOPPED OFF. HAVE RECEIVED 28 OF SUCH CELLS SINCE 11-30-99. CELLS ARE OF FAA APPROVED MATERIAL, ETC. SUBMITTER CONCERNED ABOUT THEIR RELIABILITY IN THE FUTURE IN THAT THERE ARE A LOT OF THESE CELLS OUT THERE. HAVE ADVISED MANUFACTURING INSPECTOR IN ATLANTA, GA OF THE PROBLEM TODAY, 2-24-00, AFTER FINDING RETURNS IN LOG BOOK. (X)