What was found
TAIL ROTOR BLADE MAKING A POPPING NOISE COMING FROM THE SPAR WHEN FLEXED. FOUND BLADE SPAR CRACKED IN TWO PLACES, ONE APPORXIMATELY 48 MM OTBD FROM CENTER OF SPAR , 20 MM LONG FROM L/E TO CENTER OF SPAR ON TARGET BLADE AND ONE APPROX 51 MM LONG FROM L/E TO CENTER SPAR ON TARGET BLADE AND 1 APPROXIMATELY 51 MM OTBD FROM CENTER OF SPAR, 32 MM LONG FROM L/E TO CENTER OF SPAR, 32 MM LONG FROM L/E TO CENTER OF SPAR ON OPPOSITE BLADE. COULD BE CAUSED TO AGE OF BLADE. REPLACED THE ROTOR BLADE