Close proximity air carrier-medium large transport GA-small aircraft in psp TRSA.

Attributes
ACN	199458
Time
Date	199201
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : psp
State Reference	CA
Altitude	msl bound lower : 9500 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : psp tower : iah
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 250 flight time total : 13000 flight time type : 1500
ASRS Report	199458
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 5000 flight time type : 100
ASRS Report	199291
Events
Anomaly	conflict : nmac non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 600
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Approach control had cleared us to descend from 11000 ft to 7000 ft and to turn to a heading of 180 degrees for an approach to runway 30 at psp. At 9800 ft we received a 'traffic' TA followed immediately by a 'decrease descent' RA which was repeated several times. The descent was stopped at 9500 ft and an immediate climb back to 10000 ft was begun. At about 9700 ft TCASII advised 'clear of traffic.' as the climb was stopped at 10000 ft, the first officer saw an small aircraft emerge from beneath us on a heading of approximately 190 degrees. I did not see the traffic at any time. The first officer is very familiar with executive type aircraft and estimated that at the time he saw the traffic, it was 500-700 ft below us on the right side. He felt sure that a midair collision would have occurred had we not taken evasive action. Approach control did not advise us at any time of a possible conflict. The psp tower supervisor later informed me that a 40 percent developmental had handled us under the supervision of a qualified controller.

Original NASA ASRS Text

Title: CLOSE PROX ACR-MLG GA-SMA IN PSP TRSA.

Narrative: APCH CTL HAD CLRED US TO DSND FROM 11000 FT TO 7000 FT AND TO TURN TO A HDG OF 180 DEGS FOR AN APCH TO RWY 30 AT PSP. AT 9800 FT WE RECEIVED A 'TFC' TA FOLLOWED IMMEDIATELY BY A 'DECREASE DSCNT' RA WHICH WAS REPEATED SEVERAL TIMES. THE DSCNT WAS STOPPED AT 9500 FT AND AN IMMEDIATE CLB BACK TO 10000 FT WAS BEGUN. AT ABOUT 9700 FT TCASII ADVISED 'CLR OF TFC.' AS THE CLB WAS STOPPED AT 10000 FT, THE FO SAW AN SMA EMERGE FROM BENEATH US ON A HDG OF APPROX 190 DEGS. I DID NOT SEE THE TFC AT ANY TIME. THE FO IS VERY FAMILIAR WITH EXECUTIVE TYPE ACFT AND ESTIMATED THAT AT THE TIME HE SAW THE TFC, IT WAS 500-700 FT BELOW US ON THE R SIDE. HE FELT SURE THAT A MIDAIR COLLISION WOULD HAVE OCCURRED HAD WE NOT TAKEN EVASIVE ACTION. APCH CTL DID NOT ADVISE US AT ANY TIME OF A POSSIBLE CONFLICT. THE PSP TWR SUPVR LATER INFORMED ME THAT A 40 PERCENT DEVELOPMENTAL HAD HANDLED US UNDER THE SUPERVISION OF A QUALIFIED CTLR.

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.