Narrative:

Event: captain taxiing aircraft on taxiway a to runway 12R. Ground control changes clearance to 'taxi to runway 12L via runway 6, hold short of runway 12R.' first officer reads back clearance to ground control. First officer is heads-down reprogramming runway and v-spds in FMS. Approaching runway 12R, captain checks runway 12R hold short clearance with ground control. Ground advises flight to hold short. After runway 12R arrival lands, ground clears flight to cross runway 12R. Once past runway 12R, first officer heads-down again, finalizing FMS changes and flight switches to tower frequency. As first officer looks up, both captain and first officer realize their aircraft is rapidly approaching the runway 12L hold short line on runway 6 without further clearance. Captain aggressively applies brakes and aircraft comes to a stop with nose over the hold short line. No conflicts. Tower then clears flight into position and hold on runway 12L, followed by takeoff clearance. Factors: maintenance delay at gate with MEL operational restrs for flight to consider and brief prior to takeoff. First officer heads-down due to runway change -- FMS. Less-than-ideal runway/taxiway layout at field. Captain eager for departure to make up time. Prevention: cautious taxiing, especially near runways. First officer's watch taxi progress diligently, especially when cleared to 'hold short.' when crew finds itself in a hurry, slow down and xchk actions of both crew members.

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Original NASA ASRS Text

Title: 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.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.