ACR ABORTS TKOF AS SMA STARTS TKOF ROLL.

Narrative

SIMULTANEOUS INTERSECTING RWY OPS WERE BEING CONDUCTED AT DCA ON RWYS 3; 36; 33. WE WERE CLRED TO TKOF ON RWY 36 AND ACKNOWLEDGED CLRNC TO TWR. AT THE SAME TIME; TWR CLRED ANOTHER ACFT TO LAND ON RWY 33 AND ALSO HAD PREVIOUSLY CLRED A LIGHT ACFT FOR TKOF ON RWY 3. OUR ACFT WAS ON TXWY C HOLDING SHORT OF 36 WHEN CLRNC TO TKOF WAS RECEIVED; SO IT WAS IMPOSSIBLE TO SEE RWY 3. WE WERE ROLLING ONTO RWY 36; COMPLETING CHKLISTS AND ADVANCED PWR FOR TKOF. SUDDENLY; TWR CALLED 'ACR X; STOP; STOP!' I ABORTED THE TKOF IMMEDIATELY AND; AT THE SAME TIME; SAW THAT THE LIGHT ACFT WAS JUST BEGINNING TKOF ON RWY 3. WE EXITED THE RWY AT TXWY A AND TAXIED BACK TO RWY 36. THE LIGHT ACFT CONTINUED HIS TKOF. SIMULTANEOUS OPS AT DCA ARE PARTICULARLY HAZARDOUS. 2-MAN CREW ACFT ARE EXTREMELY BUSY IN CERTAIN PHASES OF OPS AND ESPECIALLY SO JUST PRIOR TO TKOF. FORTUNATELY; TWR AND I SAW THE CONFLICT SOON ENOUGH TO AVOID AN ACCIDENT. IN 2-MAN CREWS; 1 CREW MEMBER IS READING CHKLIST ITEMS AND THE OTHER IS RESPONDING JUST PRIOR TO TKOF ROLL. ALTHOUGH WE BOTH CLRLY HEARD OUR CLRNC AND RESPONDED TO TWR; OUR SITUATIONAL AWARENESS OF WHAT TWR WAS DOING WITH OTHER ACFT WAS NOT AS CLR AS IT SHOULD BE. 3-MAN CREW CONCEPT ACFT ARE MUCH BETTER IN THIS REGARD; AS 2 COMPLETE PRE- TKOF CHKS AND PF DEVOTES TOTAL ATTN TO FLYING THE ACFT AND SITUATIONAL AWARENESS. COMS ALSO ARE INCREASINGLY BLOCKED BY TOO MANY XMISSIONS AND MANY TIMES; CLRNCS ARE DELAYED OR TOTALLY LOST. SIMULTANEOUS INTERSECTING OPS AT DCA ARE AN ACCIDENT WAITING TO HAPPEN.