Narrative:

Incident occurred while climbing out of lax on the gorman 1 SID, with clearance to climb to FL230. Position at the start of the conflict was outbound on the lax 328 radial, 25 DME. Passing through about 14100 ft, TCASII announced 'traffic, traffic.' target appeared to be at about 15500 ft in my 1 O'clock position, closing. A couple of hundred ft later in the climb ATC instructed me to level at 15000 ft for traffic, and simultaneously TCASII ordered me to 'climb, crossing climb' demanding a rate in excess of 2500 FPM. Since I had taken off just 2000 pounds shy of my maximum takeoff weight, I was still far too heavy to make such a high performance climb, so I chose to ignore TCASII and comply with ATC's instructions to level at 15000 ft. I also started a 15 degree bank turn to the left to avoid the target's flight path. As I was passing through 14800 ft I heard the other aircraft say that he was turning right. Since this would again put him on an intercept with me, I reversed my turn, rolling out in a 15 degree bank right turn. While I was doing this, TCASII changed its mind and issued a 'descend, descend' command. Since this seemed reasonable, I initiated a descent of about 1000 FPM, eventually getting back down to about 14200 ft. At this point the target was behind me and the conflict resolved. I turned back to the departure airway and started to climb back to 15000 ft. Before I reached 15000 ft, ATC reclred me to FL230 and we continued on our jolly way. During the entire sequence my highest altitude was 14900 ft, lowest 14100 ft. According to TCASII the least vertical separation between my aircraft and the target was 700 ft and the least horizontal separation was about 1/4 mi.

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Original NASA ASRS Text

Title: CLOSE PROX ACR MLG ON SID OUT OF LAX AND UNK VFR ACFT INBOUND.

Narrative: INCIDENT OCCURRED WHILE CLBING OUT OF LAX ON THE GORMAN 1 SID, WITH CLRNC TO CLB TO FL230. POS AT THE START OF THE CONFLICT WAS OUTBOUND ON THE LAX 328 RADIAL, 25 DME. PASSING THROUGH ABOUT 14100 FT, TCASII ANNOUNCED 'TFC, TFC.' TARGET APPEARED TO BE AT ABOUT 15500 FT IN MY 1 O'CLOCK POS, CLOSING. A COUPLE OF HUNDRED FT LATER IN THE CLB ATC INSTRUCTED ME TO LEVEL AT 15000 FT FOR TFC, AND SIMULTANEOUSLY TCASII ORDERED ME TO 'CLB, XING CLB' DEMANDING A RATE IN EXCESS OF 2500 FPM. SINCE I HAD TAKEN OFF JUST 2000 POUNDS SHY OF MY MAX TKOF WT, I WAS STILL FAR TOO HVY TO MAKE SUCH A HIGH PERFORMANCE CLB, SO I CHOSE TO IGNORE TCASII AND COMPLY WITH ATC'S INSTRUCTIONS TO LEVEL AT 15000 FT. I ALSO STARTED A 15 DEG BANK TURN TO THE L TO AVOID THE TARGET'S FLT PATH. AS I WAS PASSING THROUGH 14800 FT I HEARD THE OTHER ACFT SAY THAT HE WAS TURNING R. SINCE THIS WOULD AGAIN PUT HIM ON AN INTERCEPT WITH ME, I REVERSED MY TURN, ROLLING OUT IN A 15 DEG BANK R TURN. WHILE I WAS DOING THIS, TCASII CHANGED ITS MIND AND ISSUED A 'DSND, DSND' COMMAND. SINCE THIS SEEMED REASONABLE, I INITIATED A DSCNT OF ABOUT 1000 FPM, EVENTUALLY GETTING BACK DOWN TO ABOUT 14200 FT. AT THIS POINT THE TARGET WAS BEHIND ME AND THE CONFLICT RESOLVED. I TURNED BACK TO THE DEP AIRWAY AND STARTED TO CLB BACK TO 15000 FT. BEFORE I REACHED 15000 FT, ATC RECLRED ME TO FL230 AND WE CONTINUED ON OUR JOLLY WAY. DURING THE ENTIRE SEQUENCE MY HIGHEST ALT WAS 14900 FT, LOWEST 14100 FT. ACCORDING TO TCASII THE LEAST VERT SEPARATION BTWN MY ACFT AND THE TARGET WAS 700 FT AND THE LEAST HORIZ SEPARATION WAS ABOUT 1/4 MI.

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.