What was found
C/W PIPER SB 897A PART I DATED12-88. IN JULY '89 AT 3,311 ACFT HOURS, LT AND RT ELEVATOR BUTT RIBS WERE CRACKED AT THAT TIME AND REPLACED PER SB AT 4,005 ACFT HOURS. FOUND BUTT RIBS CRACKED AGAIN. C/W SB 897A PART I AND II DATED 1-90. SUBMITTER STATED HAS NOT SEEN OR HEARD OF A PA31T THAT HAS BEEN INSPECTED THAT DID NOT HAVE CRACKS IN ELEVATOR BUTT RIBS AND/OR IN THE SPAR OR FALSE SPARS. NEEDS TO BE AD NOTE TO ENSURE COMPLIANCE.