<< >> NASA ASRS Report 622539, June 2004

ZOA ARTCC oceanic sector near guam and tyo had a serious equipment outage that seriously disrupted ATC service.

Attributes
ACN	622539
Time
Date	200406
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : zoa.artcc
State Reference	CA
Altitude	agl single value : 0
Environment
Weather Elements	Turbulence Thunderstorm Rain other
Aircraft 1
Operator	other
Make Model Name	Military
Flight Phase	cruise : enroute altitude change descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : non radar
Qualification	controller : radar
Experience	controller non radar : 15 controller radar : 13
ASRS Report	622539
Person 2
Affiliation	government : faa
Function	controller : radar
Events
Anomaly	inflight encounter : weather other anomaly other
Independent Detector	other controllera other controllerb other other : 3
Resolutory Action	controller : separated traffic
Supplementary
Problem Areas	Weather ATC Facility Airspace Structure Navigational Facility
Primary Problem	Ambiguous

Narrative:

On jun/tue/04, at ZOA oceanic sector 5, at about XA30Z, tyo aidc interface and nadin suffered an unscheduled, unplanned outage. Loss affected the entire oceanic area's cpdlc message processing, conflict probe/conflict alert and tyo interface capability. This outage occurred during a very busy traffic period, with several unusual military aircraft sits and severe WX over guam (which caused numerous WX deviations and reroutes). Due to the outage complexity at oceanic sector 5 workload was increased to almost unmanageable levels for a period of about 3 hours.

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Original NASA ASRS Text

Title: ZOA ARTCC OCEANIC SECTOR NEAR GUAM AND TYO HAD A SERIOUS EQUIP OUTAGE THAT SERIOUSLY DISRUPTED ATC SVC.

Narrative: ON JUN/TUE/04, AT ZOA OCEANIC SECTOR 5, AT ABOUT XA30Z, TYO AIDC INTERFACE AND NADIN SUFFERED AN UNSCHEDULED, UNPLANNED OUTAGE. LOSS AFFECTED THE ENTIRE OCEANIC AREA'S CPDLC MESSAGE PROCESSING, CONFLICT PROBE/CONFLICT ALERT AND TYO INTERFACE CAPABILITY. THIS OUTAGE OCCURRED DURING A VERY BUSY TFC PERIOD, WITH SEVERAL UNUSUAL MIL ACFT SITS AND SEVERE WX OVER GUAM (WHICH CAUSED NUMEROUS WX DEVS AND REROUTES). DUE TO THE OUTAGE COMPLEXITY AT OCEANIC SECTOR 5 WORKLOAD WAS INCREASED TO ALMOST UNMANAGEABLE LEVELS FOR A PERIOD OF ABOUT 3 HRS.

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.