What was found
(CAN) WHILE WATER BUCKETING A COMPRESSOR STALL OCCURRED. THE PILOT HOVER TAXIED WITH REDUCED POWER TO THE SHORELINE. AT THE SHORELINE HE DROPPED HIS LOAD AND THE AIRCRAFT WAS RETURNED BACK TO STAGING AREA AND A NORMAL ENGINE SHUTDOWN WAS CARRIED OUT. AFTER THE COMPRESSOR STALL THE FUEL FILTER WAS CHECKED. THE ENGINEER FOUND CONTAMINATION IN THE FUEL FILTER. THE ENGINE BLEED BAND AND VARIABLE INLET GUIDE VANES WERE FOUND OUT OF ADJUSTMENT. THE FUEL CONTROL IS GETTING NEAR OVERHAUL SO MAYBE IT WAS GETTING TIRED OR POSSIBLE FUEL CONTAMINATION MIGHT HAVE CONTRIBUTED TO THE COMPRESSOR STALL.