ATC equipment problem radar ASR-9 loss of target.

Attributes
ACN	261885
Time
Date	199401
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : slc
State Reference	UT
Altitude	msl bound lower : 7000 msl bound upper : 7000
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : slc
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller military : 8 controller radar : 14 controller supervisory : 2
ASRS Report	261885
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument
Events
Anomaly	other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	other

Narrative:

Aircraft X was on ILS approach to runway 34 at slc. I lost his radar beacon target for 6 mi on final. Asked the pilot if he was still being interrogated and he said yes. The transponder was probably being interrogated by ZLC's radar. The slc ASR 9 would not track the aircraft's transponder.

Original NASA ASRS Text

Title: ATC EQUIP PROB RADAR ASR-9 LOSS OF TARGET.

Narrative: ACFT X WAS ON ILS APCH TO RWY 34 AT SLC. I LOST HIS RADAR BEACON TARGET FOR 6 MI ON FINAL. ASKED THE PLT IF HE WAS STILL BEING INTERROGATED AND HE SAID YES. THE XPONDER WAS PROBABLY BEING INTERROGATED BY ZLC'S RADAR. THE SLC ASR 9 WOULD NOT TRACK THE ACFT'S XPONDER.

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.