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Air carrier PIC reports a common loss of omega and HF communication to his and other air carrier aircraft for 1 hour while on pacific oceanic flight.
| Attributes | |
| ACN | 180230 |
| Time | |
| Date | 199106 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zoa |
| State Reference | CA |
| Altitude | msl bound lower : 34000 msl bound upper : 34000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : other oceanic enroute : pacific enroute airway : r577 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 13000 flight time type : 3000 |
| ASRS Report | 180230 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | other |
Narrative:
Aircraft experienced duel omega navigational difficulties. Winds became obviously erroneous, omegas went into ambiguity, aircraft experienced loss of all HF communications for approximately 1 hour. Aircraft maintained contact with other aircraft on route experiencing same problems. Utilized wind from INS equipped aircraft just ahead on same track. Eventually, ambiguity cleared. Sent navigation unreliable report to ATC.
Original NASA ASRS Text
Title: ACR PIC REPORTS A COMMON LOSS OF OMEGA AND HF COM TO HIS AND OTHER ACR ACFT FOR 1 HR WHILE ON PACIFIC OCEANIC FLT.
Narrative: ACFT EXPERIENCED DUEL OMEGA NAVIGATIONAL DIFFICULTIES. WINDS BECAME OBVIOUSLY ERRONEOUS, OMEGAS WENT INTO AMBIGUITY, ACFT EXPERIENCED LOSS OF ALL HF COMS FOR APPROX 1 HR. ACFT MAINTAINED CONTACT WITH OTHER ACFT ON RTE EXPERIENCING SAME PROBS. UTILIZED WIND FROM INS EQUIPPED ACFT JUST AHEAD ON SAME TRACK. EVENTUALLY, AMBIGUITY CLRED. SENT NAV UNRELIABLE RPT TO ATC.
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.