Narrative:

B757 cleared for takeoff runway 1L (no heading assigned). Carj cleared for takeoff runway 1R heading 360 degrees (split lcls, local west on runway 1L, local east on runway 1R). B757 turned left heading 340 degrees late. 2 aircraft converged 5 mi north of iad airport, B757, 2900 ft climbing to 3000 ft, carj, 3700 ft climbing to 4000 ft. Runways 1L and 1R at iad are not sufficiently far apart to use runway heading with simultaneous departures. Airspace design does not allow runway heading from runway 1R. Both runways 1L and 1R departures must be turned in same direction after takeoff, creating a potential conflict constantly. In this case, the B757 was not issued a turn to 340 degrees with takeoff clearance, causing runway 1R departure on 360 degree heading to converge.

Related reports:

Google
 

Original NASA ASRS Text

Title: LCL #1 AND LCL #2 DID NOT COORDINATE THEIR AFTER TKOF HEADINGS FOR ACFT #1 AND #2. AFTER TKOF, LCL #1 TOOK ACTION TO SEPARATE ACFT #1 FROM ACFT #2. ACTION WAS TOO LATE, RESULTED IN OPERROR.

Narrative: B757 CLRED FOR TKOF RWY 1L (NO HEADING ASSIGNED). CARJ CLRED FOR TKOF RWY 1R HDG 360 DEGS (SPLIT LCLS, LCL W ON RWY 1L, LCL E ON RWY 1R). B757 TURNED L HDG 340 DEGS LATE. 2 ACFT CONVERGED 5 MI N OF IAD ARPT, B757, 2900 FT CLBING TO 3000 FT, CARJ, 3700 FT CLBING TO 4000 FT. RWYS 1L AND 1R AT IAD ARE NOT SUFFICIENTLY FAR APART TO USE RWY HEADING WITH SIMULTANEOUS DEPS. AIRSPACE DESIGN DOES NOT ALLOW RWY HEADING FROM RWY 1R. BOTH RWYS 1L AND 1R DEPS MUST BE TURNED IN SAME DIRECTION AFTER TKOF, CREATING A POTENTIAL CONFLICT CONSTANTLY. IN THIS CASE, THE B757 WAS NOT ISSUED A TURN TO 340 DEGS WITH TKOF CLRNC, CAUSING RWY 1R DEP ON 360 DEG HDG TO CONVERGE.

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.