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An air carrier large transport was navigating with omega in domestic airspace. ATC detected a navigation error. The flight returned to it's course using VOR. Omega sets checked out of tolerance on the ground. There was no traffic conflict.
| Attributes | |
| ACN | 207654 |
| Time | |
| Date | 199204 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : lyh |
| State Reference | VA |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc tower : abe |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : direct enroute airway : zdc |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 50 flight time total : 16710 flight time type : 5180 |
| ASRS Report | 207654 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 100 flight time total : 4060 flight time type : 30 |
| ASRS Report | 208279 |
| Events | |
| Anomaly | non adherence : clearance non adherence other other anomaly other other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : overcame equipment problem flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
During the arrival into charlotte, nc, on majic 5 arrival, ATC had cleared us from north of roanoke, va, VOR direct to mayos intersection. This clearance was complied with using omega navigation system. As we approached the vicinity of mayos a xchk off of lynchburg VOR we noted an error in our position contradictory to the position reported by omega. This was discussed with washington ATC and a correction made. No conflict with traffic existed and upon arrival our destination of charlotte, nc, both omegas were checked for position error and found to be in error by 39.9 NM on one system and 54.0 NM in error on the other system. This malfunction was entered in the aircraft maintenance log. Avionics maintenance personnel suspected error in omega transmission possibly a phase error.
Original NASA ASRS Text
Title: AN ACR LGT WAS NAVIGATING WITH OMEGA IN DOMESTIC AIRSPACE. ATC DETECTED A NAV ERROR. THE FLT RETURNED TO IT'S COURSE USING VOR. OMEGA SETS CHKED OUT OF TOLERANCE ON THE GND. THERE WAS NO TFC CONFLICT.
Narrative: DURING THE ARR INTO CHARLOTTE, NC, ON MAJIC 5 ARR, ATC HAD CLRED US FROM N OF ROANOKE, VA, VOR DIRECT TO MAYOS INTXN. THIS CLRNC WAS COMPLIED WITH USING OMEGA NAV SYS. AS WE APCHED THE VICINITY OF MAYOS A XCHK OFF OF LYNCHBURG VOR WE NOTED AN ERROR IN OUR POS CONTRADICTORY TO THE POS RPTED BY OMEGA. THIS WAS DISCUSSED WITH WASHINGTON ATC AND A CORRECTION MADE. NO CONFLICT WITH TFC EXISTED AND UPON ARR OUR DEST OF CHARLOTTE, NC, BOTH OMEGAS WERE CHKED FOR POS ERROR AND FOUND TO BE IN ERROR BY 39.9 NM ON ONE SYS AND 54.0 NM IN ERROR ON THE OTHER SYS. THIS MALFUNCTION WAS ENTERED IN THE ACFT MAINT LOG. AVIONICS MAINT PERSONNEL SUSPECTED ERROR IN OMEGA XMISSION POSSIBLY A PHASE ERROR.
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.