S80 flight crew stopped their climb to avoid aircraft that was descending to their altitude.

Attributes
ACN	463340
Time
Date	200002
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : psp.tracon
State Reference	CA
Altitude	msl single value : 12400
Aircraft 1
Controlling Facilities	tracon : psp.tracon
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Route In Use	departure : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : psp.tracon
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
ASRS Report	463340
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure
Independent Detector	aircraft equipment : tcas other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

At XA18Z on departure from psp had what flight crew would call a loss of separation. Clearance to 13000 ft on a 150 degree heading direct tnp when we observed a TA descending in our flight path. We leveled the aircraft at 12400 ft. When aircraft Y checked on our frequency he said he had been cleared to 12000 ft. He was given an immediate left turn to maintain vertical and lateral separation. I called the psp tower supervisor in dallas and he informed me that they had reviewed the radar track and they determined we never loss separation with aircraft Y and had 1200 ft vertical and 5 NM lateral separation. Tower supervisor stated no further action would be taken.

Original NASA ASRS Text

Title: S80 FLC STOPPED THEIR CLB TO AVOID ACFT THAT WAS DSNDING TO THEIR ALT.

Narrative: AT XA18Z ON DEP FROM PSP HAD WHAT FLC WOULD CALL A LOSS OF SEPARATION. CLRNC TO 13000 FT ON A 150 DEG HDG DIRECT TNP WHEN WE OBSERVED A TA DSNDING IN OUR FLT PATH. WE LEVELED THE ACFT AT 12400 FT. WHEN ACFT Y CHKED ON OUR FREQ HE SAID HE HAD BEEN CLRED TO 12000 FT. HE WAS GIVEN AN IMMEDIATE L TURN TO MAINTAIN VERT AND LATERAL SEPARATION. I CALLED THE PSP TWR SUPVR IN DALLAS AND HE INFORMED ME THAT THEY HAD REVIEWED THE RADAR TRACK AND THEY DETERMINED WE NEVER LOSS SEPARATION WITH ACFT Y AND HAD 1200 FT VERT AND 5 NM LATERAL SEPARATION. TWR SUPVR STATED NO FURTHER ACTION WOULD BE TAKEN.

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.