Frequency outages caused problems at facility and disrupted traffic flow.

Attributes
ACN	118151
Time
Date	198907
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zla
State Reference	CA
Aircraft 1
Controlling Facilities	tower : jac
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
ASRS Report	118151
Events
Anomaly	other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other
Situations
ATC Facility	other physical facility

Narrative:

On 7/xx/89, ord xx sector 20 suffered a total frequency failure event and no cause could be found for it. On 7/xx/89, at XX10 pm local, sector 10 (which was combined with 9) lost all its frequencys and no reason could be found for it. The frequencys slowly faded out and then came back slowly after 10 mins total outage. Both incident (actually 3 times) appear similar and I think demands a complete review by at and af. The sector 20 failure occurred under at least moderate traffic.

Original NASA ASRS Text

Title: FREQ OUTAGES CAUSED PROBLEMS AT FAC AND DISRUPTED TRAFFIC FLOW.

Narrative: ON 7/XX/89, ORD XX SECTOR 20 SUFFERED A TOTAL FREQ FAILURE EVENT AND NO CAUSE COULD BE FOUND FOR IT. ON 7/XX/89, AT XX10 PM LCL, SECTOR 10 (WHICH WAS COMBINED WITH 9) LOST ALL ITS FREQS AND NO REASON COULD BE FOUND FOR IT. THE FREQS SLOWLY FADED OUT AND THEN CAME BACK SLOWLY AFTER 10 MINS TOTAL OUTAGE. BOTH INCIDENT (ACTUALLY 3 TIMES) APPEAR SIMILAR AND I THINK DEMANDS A COMPLETE REVIEW BY AT AND AF. THE SECTOR 20 FAILURE OCCURRED UNDER AT LEAST MODERATE TFC.

Data retrieved from NASA's ASRS site as of August 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.