MULTIPLE RWY OP INTERSECTING RWYS SMT Y TKOF ON OCCUPIED RWY HAD LTSS FROM ACR Y. SYS ERROR.

Narrative

SMT X WAS TAXIED INTO POS TO HOLD ON RWY 4 FOR AN INTXN DEP. GND CTL APPROVED THE RWY 4 DEP WITH LCL CTL BECAUSE RWY 4 WAS AN INACTIVE RWY. ACR Y WAS FINISHING ITS LNDG ROLLOUT ON RWY 29R. RWYS 29R AND 4 INTERSECT. AFTER ACR Y ROLLED THROUGH THE INTXN OF RWY 4 LCL CTL CLRED SMT X FOR TKOF. ACR Y CALLED GND CTL AFTER EXITING RWY 29R. GND CTL INSTRUCTED THE ACR Y TO TAXI TO ITS GATE. THE ROUTING REQUIRED THE ACR Y TO CROSS RWY 4. ACR Y OBSERVED SMT X DEPARTING RWY 4 AND STOPPED A SHORT DISTANCE ONTO THE RWY. SMT X WAS AIRBORNE ABOUT 2000 FT PRIOR TO ACR Y'S POS AND CLBED OUT NEAR ACR Y. ELAPSED TIME FROM WHEN SMT X WAS CLRED FOR TKOF UNTIL HE BECAME AIRBORNE WAS 46 SECONDS -- SMT X HAD DELAYED HIS TKOF ABOUT 30 SECONDS WITHOUT ADVISING ATC. GND CTL HAD PLANNED FOR SMT X TO NOT BE A FACTOR WHEN ACR Y APCH RWY 4 ON HIS WAY TO THE GATE. THIS WAS BASED ON THE DISTANCE ACR X HAD TO TAXI TO GET TO RWY 4 AND THE AMOUNT OF TIME THAT HAD PASSED SINCE THE SMT X HAD BEEN CLRED FOR TKOF. SUPPLEMENTAL INFO FROM ACN 213909. ACR Y LANDED MSP RWY 29R. CLRED RWY. CALLED GND. GND 'TO PARKING VIA (SOMETHING).' APCHING CROSS RWY 04; COPLT 'THERE'S AN AIRPLANE ON RWY.' SIMULTANEOUSLY; I BRAKED HARD AS I SAW ACFT COMING. COPLT 'HE'S TAKING OFF.' STOPPED WITH OUR NOSE AT RWY EDGE. 2 ENG PROP BUSINESS ACFT AIRBORNE 1000-2000 PLUS FT PRIOR TO OUR LOCATION.