What was found
SHIP 6811 - RVSM - ENROUTE FO ALTIMETER WOULD MOVE UP AND DOWN 500 FEET OFF FLAG WOULD THEN COME ON, HAPPENED EVERY 30 MINUTES. CORRECTIVE ACTION: REPLACED FO ALTIMETER PER B757 AMM 34-13. OPS CK NML.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
SHIP 6811 - RVSM - ENROUTE FO ALTIMETER WOULD MOVE UP AND DOWN 500 FEET OFF FLAG WOULD THEN COME ON, HAPPENED EVERY 30 MINUTES. CORRECTIVE ACTION: REPLACED FO ALTIMETER PER B757 AMM 34-13. OPS CK NML.