What was found
THE CAPT'S AND F/O ALTIMETER SPLIT AT FL 350 TO FL 390 AND AN AIR SPEED DIFFERENCE. SDR REMAINS OPEN - ALTITUDE- 39,000 - CAPTAINS INDICATOR- 39,000 - F/O INDICATOR- 38,820 - STANDBY INDICATOR- 39,350 - CAPT'S MACH INDICATOR- .818 - F/O MACH INDICATOR- .809. ACFT DIDN’T EXCEED 20KTS OVERSPEED. PERFORMED A/C INSPECTION IAW MM 05-51-04, NO DEFECTS. PERFORMED FIM 22-00-03 FIG 103 110A + 117. ALL TEST OK. SPEED WERE VERIFIED WITH FLIGHT CREW DEBRIEF F/O VERIFIED SPEEDS AT .85 M EXCEED BY 2 TO 3 KTS / PERHAPS BY .002 MACH.