<< >> NASA ASRS Report 410589, August 1998

Controller at ZFW states it was necessary to xfer control of a low sector to another sector due to a loss of an ATC frequency. It was learned that a line had been cut. It also affected the monitoring of several major navaids.

Attributes
ACN	410589
Time
Date	199808
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zfw
State Reference	TX
Altitude	agl bound lower : 0 agl bound upper : 0
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar pilot : instrument
Experience	controller non radar : 14 controller radar : 16 flight time total : 1000
ASRS Report	410589
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	other
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Mlc lo was on another sector's frequency 133.9. The radio coverage was inadequate for the sector but buec was unusable because of bleed over from same site frequencys. At XB00 the normal mlc lo frequency was returned to service. A line had been cut. This made several major navaids (tul, okc, adm, mlc) go 'unmonitored' status. Severe WX was in the area at the time and the east side of the sector did not have radio coverage.

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Original NASA ASRS Text

Title: CTLR AT ZFW STATES IT WAS NECESSARY TO XFER CTL OF A LOW SECTOR TO ANOTHER SECTOR DUE TO A LOSS OF AN ATC FREQ. IT WAS LEARNED THAT A LINE HAD BEEN CUT. IT ALSO AFFECTED THE MONITORING OF SEVERAL MAJOR NAVAIDS.

Narrative: MLC LO WAS ON ANOTHER SECTOR'S FREQ 133.9. THE RADIO COVERAGE WAS INADEQUATE FOR THE SECTOR BUT BUEC WAS UNUSABLE BECAUSE OF BLEED OVER FROM SAME SITE FREQS. AT XB00 THE NORMAL MLC LO FREQ WAS RETURNED TO SVC. A LINE HAD BEEN CUT. THIS MADE SEVERAL MAJOR NAVAIDS (TUL, OKC, ADM, MLC) GO 'UNMONITORED' STATUS. SEVERE WX WAS IN THE AREA AT THE TIME AND THE E SIDE OF THE SECTOR DID NOT HAVE RADIO COVERAGE.

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.