ZFW controller alerts supervisor to check on aircraft GPS frequency interference.

Attributes
ACN	519994
Time
Date	200107
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zfw.artcc
State Reference	TX
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : iad.tower
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 10 controller time certified in position1 : 4
ASRS Report	519994
Events
Anomaly	aircraft equipment problem : critical inflight encounter : weather other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : gps other controllera other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	faa : investigated
Supplementary
Problem Areas	Company FAA ATC Facility
Situations
ATC Facility	procedure or policy : zfw.artcc
Publication	NOTAM'S

Narrative:

Multiple aircraft reported problems and anomalies with their GPS equipment. Aircraft reported GPS unreliable and therefore unusable. Supervisor investigated and was told that NASA or the military was causing the problem and was given a time when GPS would work again. I recommend a nationwide NOTAM be issued whenever the GPS equipment could possibly be affected.

Original NASA ASRS Text

Title: ZFW CTLR ALERTS SUPVR TO CHK ON ACFT GPS FREQ INTERFERENCE.

Narrative: MULTIPLE ACFT RPTED PROBS AND ANOMALIES WITH THEIR GPS EQUIP. ACFT RPTED GPS UNRELIABLE AND THEREFORE UNUSABLE. SUPVR INVESTIGATED AND WAS TOLD THAT NASA OR THE MIL WAS CAUSING THE PROB AND WAS GIVEN A TIME WHEN GPS WOULD WORK AGAIN. I RECOMMEND A NATIONWIDE NOTAM BE ISSUED WHENEVER THE GPS EQUIP COULD POSSIBLY BE AFFECTED.

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.