RWY INCURSION AT STL; MO.

Narrative

EVENT: CAPT TAXIING ACFT ON TXWY A TO RWY 12R. GND CTL CHANGES CLRNC TO 'TAXI TO RWY 12L VIA RWY 6; HOLD SHORT OF RWY 12R.' FO READS BACK CLRNC TO GND CTL. FO IS HEADS-DOWN REPROGRAMMING RWY AND V-SPDS IN FMS. APCHING RWY 12R; CAPT CHKS RWY 12R HOLD SHORT CLRNC WITH GND CTL. GND ADVISES FLT TO HOLD SHORT. AFTER RWY 12R ARR LANDS; GND CLRS FLT TO CROSS RWY 12R. ONCE PAST RWY 12R; FO HEADS-DOWN AGAIN; FINALIZING FMS CHANGES AND FLT SWITCHES TO TWR FREQ. AS FO LOOKS UP; BOTH CAPT AND FO REALIZE THEIR ACFT IS RAPIDLY APCHING THE RWY 12L HOLD SHORT LINE ON RWY 6 WITHOUT FURTHER CLRNC. CAPT AGGRESSIVELY APPLIES BRAKES AND ACFT COMES TO A STOP WITH NOSE OVER THE HOLD SHORT LINE. NO CONFLICTS. TWR THEN CLRS FLT INTO POS AND HOLD ON RWY 12L; FOLLOWED BY TKOF CLRNC. FACTORS: MAINT DELAY AT GATE WITH MEL OPERATIONAL RESTRS FOR FLT TO CONSIDER AND BRIEF PRIOR TO TKOF. FO HEADS-DOWN DUE TO RWY CHANGE -- FMS. LESS-THAN-IDEAL RWY/TXWY LAYOUT AT FIELD. CAPT EAGER FOR DEP TO MAKE UP TIME. PREVENTION: CAUTIOUS TAXIING; ESPECIALLY NEAR RWYS. FO'S WATCH TAXI PROGRESS DILIGENTLY; ESPECIALLY WHEN CLRED TO 'HOLD SHORT.' WHEN CREW FINDS ITSELF IN A HURRY; SLOW DOWN AND XCHK ACTIONS OF BOTH CREW MEMBERS.