AN ACR CROSSES A FIX 1000 FT BELOW THE REQUIRED ALT DUE TO AN ALTIMETER SETTING ERROR.

Narrative

AFTER PROGRAMMING PERFORMANCE MGMNT SYS (PMS) FOR DSCNT; WE WERE BEGINNING DSCNT TO ASSIGNED XING ALT OF 15000 FT AT KAYLA ARC (TRAKE ARR). ATC CLRED US DIRECT TO FTZ; RESULTING IN STEEP DSCNT TO TRY TO MAKE XING. WE ENCOUNTERED MODERATE TURB AND HAD TO SLOW TO TURB PENETRATION SPD; FURTHER EXACERBATING DSCNT PROB. CONCERNED WITH BEING HIGH AT FIX; CAPT WAS ATTEMPTING TO MAXIMIZE DSCNT WHILE FO WAS PERFORMING CHKLISTS AND ALERTING CABIN PER POLICY. AFTER LEVELING AT 15000 FT IT WAS NOTICED THAT ALTIMETER HAD BEEN SET WITH A 1 INCH DIFFERENCE (CAPT 30.47 INCHES; FO 29.47 INCHES); RESULTING IN ACTUAL ACFT ALT OF 14000 FT MSL (LCL ALTIMETER 29.47 INCHES). BECAUSE CAPT WAS PF; AUTOPLT WAS USING AIR DATA AND ALT RPTING FROM #1 SYS. IT SEEMS LIKELY THAT; SINCE #1 XPONDER WAS RPTING 15000 FT ALT TO ATC; APCH CTL DIDN'T NOTICE ALT DISCREPANCY. ERROR WAS DISCOVERED AT COMPLETION OF DSCNT/APCH CHKLIST AFTER LEVELOFF. WE WERE SUBSEQUENTLY CLRED TO 7000 FT AND COMMENCED DSCNT BEFORE HAVING A CHANCE TO CORRECT BACK UP TO 15000 FT.