Unknown interference on ATC frequencys causes disruption of ATC instructions.

Attributes
ACN	271616
Time
Date	199405
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : cmh
State Reference	OH
Environment
Flight Conditions	VMC
Light	Daylight
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 10
ASRS Report	271616
Events
Anomaly	other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : unable
Consequence	faa : investigated
Supplementary
Air Traffic Incident	other
Situations
Navigational Aid	Unspecified

Narrative:

Frequencys 125.95, 120.2, 121.5, made totally useless for 5 to 10 seconds at a time, several times due to some unknown source of interference which has plagued this facility for months. The interference is continuing to be a hazard to flight. There have been no corrective actions.

Original NASA ASRS Text

Title: UNKNOWN INTERFERENCE ON ATC FREQS CAUSES DISRUPTION OF ATC INSTRUCTIONS.

Narrative: FREQS 125.95, 120.2, 121.5, MADE TOTALLY USELESS FOR 5 TO 10 SECONDS AT A TIME, SEVERAL TIMES DUE TO SOME UNKNOWN SOURCE OF INTERFERENCE WHICH HAS PLAGUED THIS FACILITY FOR MONTHS. THE INTERFERENCE IS CONTINUING TO BE A HAZARD TO FLT. THERE HAVE BEEN NO CORRECTIVE ACTIONS.

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.