Medium large transport has TCASII RA. TRACON says no traffic.

Attributes
ACN	222422
Time
Date	199209
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : phx
State Reference	AZ
Altitude	msl bound lower : 7200 msl bound upper : 7500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : phx
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 300 flight time total : 10000 flight time type : 4000
ASRS Report	222422
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

During radar vectors for downwind runway 26L phx sky harbor we got TCASII RA intruder alert for traffic and were told to climb (don't descend) so we stopped descent and actually climbed some 300 ft from 7200 to 7500 (not sure of altitude). We could not see the intruder and presently the warning ceased. Upon notifying ATC he said that he could see nothing. We continued approach with no further incident.

Original NASA ASRS Text

Title: MLG HAS TCASII RA. TRACON SAYS NO TFC.

Narrative: DURING RADAR VECTORS FOR DOWNWIND RWY 26L PHX SKY HARBOR WE GOT TCASII RA INTRUDER ALERT FOR TFC AND WERE TOLD TO CLB (DON'T DSND) SO WE STOPPED DSCNT AND ACTUALLY CLBED SOME 300 FT FROM 7200 TO 7500 (NOT SURE OF ALT). WE COULD NOT SEE THE INTRUDER AND PRESENTLY THE WARNING CEASED. UPON NOTIFYING ATC HE SAID THAT HE COULD SEE NOTHING. WE CONTINUED APCH WITH NO FURTHER INCIDENT.

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.