Narrative:

On a rainy morning at vny airport; we held short of the runway for about 10 mins to allow some WX to pass through. Based on what we observed on our aircraft radar; we asked tower if we could be allowed to make a right turn immediately after takeoff and expect an expeditious climb to clear the cells in the area. Tower advised us to stand by while he coordination with departure; and after about 1 min cleared us 'lear XXX; cleared for takeoff runway 16R; turn right heading 210 degrees; climb and maintain 4000 ft; vectors to join the newhall 6 departure.' we took off; started our right turn at 400 ft AGL; and as we were climbing through 2000 ft MSL; received an RA to descend for traffic at 2800 ft; almost immediately above and slightly ahead of us. As we initiated the response to the RA by lowering the nose; TCASII announced 'clear of conflict;' the other aircraft continued their descent through 2500 ft behind us; and we re-established our climb to 4000 ft. When we advised departure that we had responded to an RA; he asked for our heading and altitude; and seemed surprised that we were not complying with the departure procedure. I told him that we had been cleared for the climb and initial heading for vectors to join the departure; and after a quiet moment he xferred us to another frequency. It appears to me that vny tower and socal departure did not adequately coordination the revision to our initial clearance; and socal did not know or fully understand the ramifications of our climb to 4000 ft with no initial leveloff at 1700 ft (as we would have per the newhall 6 SID in the absence of our amended clearance). Improved communication is needed between tower and departure. Attentiveness to how changes to the SID clearance will affect traffic flow is also needed.

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Original NASA ASRS Text

Title: LR60 DEP FROM VNY EXPERIENCED CONFLICT WITH UNKNOWN TFC AFTER APPARENT CONFUSION REGARDING ALTERED DEP HDG ASSIGNMENT.

Narrative: ON A RAINY MORNING AT VNY ARPT; WE HELD SHORT OF THE RWY FOR ABOUT 10 MINS TO ALLOW SOME WX TO PASS THROUGH. BASED ON WHAT WE OBSERVED ON OUR ACFT RADAR; WE ASKED TWR IF WE COULD BE ALLOWED TO MAKE A R TURN IMMEDIATELY AFTER TKOF AND EXPECT AN EXPEDITIOUS CLB TO CLR THE CELLS IN THE AREA. TWR ADVISED US TO STAND BY WHILE HE COORD WITH DEP; AND AFTER ABOUT 1 MIN CLRED US 'LEAR XXX; CLRED FOR TKOF RWY 16R; TURN R HDG 210 DEGS; CLB AND MAINTAIN 4000 FT; VECTORS TO JOIN THE NEWHALL 6 DEP.' WE TOOK OFF; STARTED OUR R TURN AT 400 FT AGL; AND AS WE WERE CLBING THROUGH 2000 FT MSL; RECEIVED AN RA TO DSND FOR TFC AT 2800 FT; ALMOST IMMEDIATELY ABOVE AND SLIGHTLY AHEAD OF US. AS WE INITIATED THE RESPONSE TO THE RA BY LOWERING THE NOSE; TCASII ANNOUNCED 'CLR OF CONFLICT;' THE OTHER ACFT CONTINUED THEIR DSCNT THROUGH 2500 FT BEHIND US; AND WE RE-ESTABLISHED OUR CLB TO 4000 FT. WHEN WE ADVISED DEP THAT WE HAD RESPONDED TO AN RA; HE ASKED FOR OUR HDG AND ALT; AND SEEMED SURPRISED THAT WE WERE NOT COMPLYING WITH THE DEP PROC. I TOLD HIM THAT WE HAD BEEN CLRED FOR THE CLB AND INITIAL HDG FOR VECTORS TO JOIN THE DEP; AND AFTER A QUIET MOMENT HE XFERRED US TO ANOTHER FREQ. IT APPEARS TO ME THAT VNY TWR AND SOCAL DEP DID NOT ADEQUATELY COORD THE REVISION TO OUR INITIAL CLRNC; AND SOCAL DID NOT KNOW OR FULLY UNDERSTAND THE RAMIFICATIONS OF OUR CLB TO 4000 FT WITH NO INITIAL LEVELOFF AT 1700 FT (AS WE WOULD HAVE PER THE NEWHALL 6 SID IN THE ABSENCE OF OUR AMENDED CLRNC). IMPROVED COM IS NEEDED BTWN TWR AND DEP. ATTENTIVENESS TO HOW CHANGES TO THE SID CLRNC WILL AFFECT TFC FLOW IS ALSO NEEDED.

Data retrieved from NASA's ASRS site as of January 2009 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.