B737-700 receives 2 TCAS RA's during descent on right downwind to runway 19R at sna.

Attributes
ACN	697572
Time
Date	200605
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sna.airport
State Reference	CA
Altitude	msl single value : 4000
Environment
Flight Conditions	Mixed
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	approach : traffic pattern
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 16000 flight time type : 13000
ASRS Report	697572
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Experience	flight time last 90 days : 180 flight time total : 6300 flight time type : 3500
ASRS Report	697573
Events
Anomaly	conflict : nmac
Independent Detector	aircraft equipment : tcas
Resolutory Action	flight crew : took evasive action
Miss Distance	vertical : 400
Supplementary
Problem Areas	Airspace Structure Flight Crew Human Performance ATC Human Performance Aircraft
Primary Problem	Ambiguous

Narrative:

While on right downwind for runway 19R in sna; we were given descent from 5000 ft. Shortly after descent began; we received an RA; disengaged the autoplt; and complied with TCAS directions. TCAS indicated an aircraft passed slight left and overhead by 400 ft. Less than 2 mins later we received a second RA that was 400 ft below us. We complied with TCAS directions and then resumed our approach. To comply with the second RA; we climbed just over 500 ft. No TA's given by socal. Both aircraft were operating opposite direction to downwind traffic flow for sna.

Original NASA ASRS Text

Title: B737-700 RECEIVES 2 TCAS RA'S DURING DSCNT ON R DOWNWIND TO RWY 19R AT SNA.

Narrative: WHILE ON R DOWNWIND FOR RWY 19R IN SNA; WE WERE GIVEN DSCNT FROM 5000 FT. SHORTLY AFTER DSCNT BEGAN; WE RECEIVED AN RA; DISENGAGED THE AUTOPLT; AND COMPLIED WITH TCAS DIRECTIONS. TCAS INDICATED AN ACFT PASSED SLIGHT L AND OVERHEAD BY 400 FT. LESS THAN 2 MINS LATER WE RECEIVED A SECOND RA THAT WAS 400 FT BELOW US. WE COMPLIED WITH TCAS DIRECTIONS AND THEN RESUMED OUR APCH. TO COMPLY WITH THE SECOND RA; WE CLBED JUST OVER 500 FT. NO TA'S GIVEN BY SOCAL. BOTH ACFT WERE OPERATING OPPOSITE DIRECTION TO DOWNWIND TFC FLOW FOR SNA.

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.