Air carrier medium large transport speed deviation responding to TCASII RA during descent to ont.

Attributes
ACN	190380
Time
Date	199109
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : psp airport : ont
State Reference	CA
Altitude	msl bound lower : 8000 msl bound upper : 9000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	tracon : ont
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Route In Use	arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 12000
ASRS Report	190380
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 9000
ASRS Report	190385
Events
Anomaly	conflict : airborne less severe non adherence : far other anomaly
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Descending on seter arrival to ont airport. We had several stepdown altitudes. Approaching 13000 ont approach said we had traffic below which indicated they had us in sight. At approximately 12000 ft with clearance to 8000 ft TCASII RA commanded approximately 4000 FPM descent. The alert was terminated approximately 9000 ft which enabled us to slow to 250 KTS passing 10000 ft. The fact that the other aircraft said he had us visually and seeing the commuter lights momentarily lured us into a false sense of security. In retrospect we should have asked for vectors away from traffic!

Original NASA ASRS Text

Title: ACR MLG SPD DEV RESPONDING TO TCASII RA DURING DSCNT TO ONT.

Narrative: DSNDING ON SETER ARR TO ONT ARPT. WE HAD SEVERAL STEPDOWN ALTS. APCHING 13000 ONT APCH SAID WE HAD TFC BELOW WHICH INDICATED THEY HAD US IN SIGHT. AT APPROX 12000 FT WITH CLRNC TO 8000 FT TCASII RA COMMANDED APPROX 4000 FPM DSCNT. THE ALERT WAS TERMINATED APPROX 9000 FT WHICH ENABLED US TO SLOW TO 250 KTS PASSING 10000 FT. THE FACT THAT THE OTHER ACFT SAID HE HAD US VISUALLY AND SEEING THE COMMUTER LIGHTS MOMENTARILY LURED US INTO A FALSE SENSE OF SECURITY. IN RETROSPECT WE SHOULD HAVE ASKED FOR VECTORS AWAY FROM TFC!

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.