Narrative:

On the departure in sna, the SID and company noise abatement procedure, for sna, dictated a climb with maximum takeoff power to 800 ft, then reduce to climb 2 power (20% below normal climb power). Then at 1 mi, turn left to a heading of 175. These 2 events happened at approximately the same time. During this departure with power being reduced, in a left turn, and lowering pitch to reduce climb, TCASII suddenly gave an oral alert. Looking at the TCASII, I saw that we were approaching the altitude of the traffic. Sna departure control then advised us of the traffic, now being at our altitude. I decided to increase climb rate to 500 ft above the traffic, with a slight increase in pitch. This action kept me away from a traffic conflict, on the SID, and quiet for a noise sensitive airport. The traffic was never seen and there was no conflict. Because of this, airspeed decreased below bug speed. As I was returning the airspeed to normal, the first officer called out the airspeed deviation. The remainder of the flight was normal. Supplemental information from acn 210283: the large transport is a quiet aircraft. The noise abatement procedure should be dropped for this aircraft.

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Original NASA ASRS Text

Title: LGT ON INITIAL CLB RECEIVES TCASII ALERT AND TFC CALL FROM ATC WITH TFC SAME ALT. INCREASES CLB RATE BUT DECREASES AIRSPD BELOW BUG SPD.

Narrative: ON THE DEP IN SNA, THE SID AND COMPANY NOISE ABATEMENT PROC, FOR SNA, DICTATED A CLB WITH MAX TKOF PWR TO 800 FT, THEN REDUCE TO CLB 2 PWR (20% BELOW NORMAL CLB PWR). THEN AT 1 MI, TURN L TO A HDG OF 175. THESE 2 EVENTS HAPPENED AT APPROX THE SAME TIME. DURING THIS DEP WITH PWR BEING REDUCED, IN A L TURN, AND LOWERING PITCH TO REDUCE CLB, TCASII SUDDENLY GAVE AN ORAL ALERT. LOOKING AT THE TCASII, I SAW THAT WE WERE APCHING THE ALT OF THE TFC. SNA DEP CTL THEN ADVISED US OF THE TFC, NOW BEING AT OUR ALT. I DECIDED TO INCREASE CLB RATE TO 500 FT ABOVE THE TFC, WITH A SLIGHT INCREASE IN PITCH. THIS ACTION KEPT ME AWAY FROM A TFC CONFLICT, ON THE SID, AND QUIET FOR A NOISE SENSITIVE ARPT. THE TFC WAS NEVER SEEN AND THERE WAS NO CONFLICT. BECAUSE OF THIS, AIRSPD DECREASED BELOW BUG SPD. AS I WAS RETURNING THE AIRSPD TO NORMAL, THE FO CALLED OUT THE AIRSPD DEV. THE REMAINDER OF THE FLT WAS NORMAL. SUPPLEMENTAL INFO FROM ACN 210283: THE LGT IS A QUIET ACFT. THE NOISE ABATEMENT PROC SHOULD BE DROPPED FOR THIS ACFT.

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.