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Air carrier widebody transport lost omega navigation reference on atlantic track to sju. Aircraft was deviating around thunderstorm activity.
| Attributes | |
| ACN | 90447 |
| Time | |
| Date | 198807 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : jfk |
| State Reference | NY |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny |
| 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 : atlantic enroute airway : a25 enroute airway : a300 enroute other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 160 flight time total : 19000 flight time type : 4000 |
| ASRS Report | 90447 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 45 flight time total : 12000 flight time type : 300 |
| ASRS Report | 90453 |
| Events | |
| Anomaly | aircraft equipment problem : less severe inflight encounter : weather other anomaly other other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Flight was southbound jfk to sju on A-300 at FL330. Received clearance from ny oceanic control via commercial radio to deviate 30 mi west to avoid a large area of thunderstorms in the vicinity of catch intersection. While deviating, omega navigation system failed to the dr mode, and indicated erroneous latitude and longitude indications. ADF bearings were plotted using diw and ddp radio beacons, but were suspected unreliable due to trw. Flight possibly infringed upon A-25 airspace, and ny oceanic was advised of this possibility through commercial radio, who issued clearance to climb to FL350, which was accomplished. Omega was corrected by nonprecision update procedure and flight returned to estimated centerline of A-300.
Original NASA ASRS Text
Title: ACR WDB LOST OMEGA NAVIGATION REFERENCE ON ATLANTIC TRACK TO SJU. ACFT WAS DEVIATING AROUND TSTM ACTIVITY.
Narrative: FLT WAS SBND JFK TO SJU ON A-300 AT FL330. RECEIVED CLRNC FROM NY OCEANIC CTL VIA COMMERCIAL RADIO TO DEVIATE 30 MI W TO AVOID A LARGE AREA OF TSTMS IN THE VICINITY OF CATCH INTXN. WHILE DEVIATING, OMEGA NAV SYS FAILED TO THE DR MODE, AND INDICATED ERRONEOUS LAT AND LONGITUDE INDICATIONS. ADF BEARINGS WERE PLOTTED USING DIW AND DDP RADIO BEACONS, BUT WERE SUSPECTED UNRELIABLE DUE TO TRW. FLT POSSIBLY INFRINGED UPON A-25 AIRSPACE, AND NY OCEANIC WAS ADVISED OF THIS POSSIBILITY THROUGH COMMERCIAL RADIO, WHO ISSUED CLRNC TO CLB TO FL350, WHICH WAS ACCOMPLISHED. OMEGA WAS CORRECTED BY NONPRECISION UPDATE PROC AND FLT RETURNED TO ESTIMATED CENTERLINE OF A-300.
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.