AN MD80 PUSHED FROM THE GATE TOO HEAVY FOR TAXI AND TKOF. AFTER RETURN TO THE GATE FOR OVERWEIGHT TAXI INSPECTION; A TIRE BOLT WAS FOUND BROKEN. THE ACR DID NOT RECORD THE OVERWEIGHT EVENT.

Narrative

SCHEDULED TO DEPART ZZZ XA45; ACTUAL DEP XB19 DUE TO LATE ACFT ARR. TPS LISTED WT RESTR FLT; PLANNED FUEL: 37800 LBS; PTOW: 149400; PLANNED RAMP: 151000; PLANNED ZFW: 112300 LBS. CAPT UPDATED FUEL AND WT RESTR WITH 37800 LBS OF FUEL. WE WERE SHOWING 150.1 ON TOTALIZER. PRIOR TO DOOR CLOSING; AGENT RPTED WE HAD 137 PAX. SHE STATED LOADS HAD ALLOWED HER 138 BUT SHE PUT ONLY 137 ON TO BE SAFE. PUSH CREW CHKED ON AND SAID WE WERE READY FOR PUSHBACK. I CALLED ZZZ OPS (RAMP) AND GOT PUSH APPROVAL. AFTER PUSHBACK; WE STARTED 1 ENG. GND CREW RELEASED ACFT WHEN I GOT A CALL FROM OPS TO SAY WE MAY BE OVERWT AND TO COME BACK TO THE GATE. WE WERE TOWED BACK TO GATE AND IN BY XB26 AND TOLD BY AGENT THAT WE WOULD NEED TO TAKE ABOUT 6 PAX OFF. CAPT TOLD HER HE WOULD COORDINATE WITH LOADS AND OPS TO GET NUMBER. I CHKED WITH OPS AND THEY WERE TALKING TO LOADS TO CONFIRM. IT WAS TAKING A WHILE SO CAPT DECIDED TO CALL LOADS HIMSELF. WHILE HE WAS ON PHONE WITH LOADS TALKING TO THEM HE ASKED WHAT OUR ZFW WAS AND THEY SAID 112644 LBS AND THAT THE FUEL AT 37800 LBS WOULD GIVE US A 150444 LBS AT PUSHBACK; BELOW OUR 150500 MAX TAXI WT. CAPT WAS TOLD THEY WOULD LOOK AT CLOSER AND GET BACK TO US. 10-15 MINS WENT BY AND WERE TOLD WE ACTUALLY HAD A 113400 ZFW WHICH WOULD MAKE US OVERWT AT 151200. I CALLED MAINT TO COME OUT AND INSPECT FOR AN OVERWT TAXIED ACFT. CAPT MADE A MAINT ENTRY. ON MAINT WALKAROUND HE FOUND A LAG BOLT SHEARED OFF THE #4 TIRE. HE RPTED THERE WERE 2 PARTS TO INSPECT AND THAT THE FIRST PART OF REPLACING TIRE WOULD TAKE US 45 MINS TO FIX AND WE COULD KEEP PAX ON. WHEN HE STEPPED OUT; I RAN OUT TO INSPECT THE WHEEL AND NOTICED THE LAG BOLT GONE. WITH THE BLACK GREASING AROUND BOLT IT IS HARD TO SEE BUT DID FIND IT RIGHT AWAY. WHILE I WAS OUT MECH CAME BACK AND TOLD CAPT THAT HE WOULD HAVE TO TAKE ACFT OTS AND PUT ACFT ON JACKS AS PART OF 2ND PART OF INSPECTION. CAPT DID A SUPERB JOB OF KEEPING PAX INFORMED AND IT WAS DULY NOTED AS THEY CAME OFF THE ACFT. CAPT CALLED DISPATCH TO COORDINATE GETTING ANOTHER ACFT. A FEW MINS LATER WE WERE TOLD FLT WAS CANCELED. SUPPLEMENTAL INFO FROM ACN 783381: HAVING REVIEWED THE MAINT LOG ENTRIES AND SIGNOFFS SINCE THE EVENT; I WANT TO KNOW WHY THE SIGNOFF FOR THE OVERWT PUSHBACK PREVIOUSLY RPTED LISTS 'NO DAMAGE FOUND OK FOR SYS.' AS PER MY PREVIOUS REPORT; UPON RETURN TO THE GATE; THE MAINT PERSON CAME OUT TO DO THE OVERWT MOVEMENT INSPECTION. UPON HIS RETURN FROM HIS EXTERIOR WALKAROUND; HE RPTED A SHEARED LUG NUT ON THE #4 MAIN TIRE. THE FO VERIFIED HIS RPT BY EXAMINING THE #4 MAIN TIRE. WE WERE TOLD THE ACFT WAS OTS DUE TO THIS AND THE EXTENDED OVERWT INSPECTION CHKLIST THAT WAS REQUIRED. THE FLT WAS CANCELED DUE TO THE ACFT BEING TAKEN OTS. YET; THERE IS NO DOCUMENTATION OF THE DAMAGE; ANY REPAIR; OR THE ACFT BEING TAKEN OTS. LIKEWISE; THERE IS NO DOCUMENTATION ANYWHERE IN THE LOG OF THE DAMAGE TO THE #4 MAIN TIRE. IMPROPER REPAIR OR DOCUMENTATION OF ACFT DAMAGE CREATES AIRWORTHINESS CONCERNS AND IS A SERIOUS SAFETY ISSUE.