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An air carrier MD80 found a disagreement between its omega navigation and its vors. Track heading deviation.
| Attributes | |
| ACN | 350020 |
| Time | |
| Date | 199610 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : tul airport : dfw |
| State Reference | OK |
| Aircraft 1 | |
| Controlling Facilities | artcc : dfw tower : gmu |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 350020 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | non adherence : published procedure non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : became reoriented |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On bowie one arrival. We were proceeding on the tul 209 degree radial. First officer was on tul and I was on ukw. According to omega, we were right of track 4-5 mi but first officer's VOR radial was centered. I switched over to tulsa and indeed the 2 vors were off. We asked ZFW where they had us and they said we were 7-8 mi right of course by this time. After the turn at ukw, both vors were together again. No other VOR abnormalities. Only thing I could think of was maybe there was someone using an FM radio in the back. It was late and I did not think of this until later. We triple checked frequencys and radials with no apparent reason for the deviation.
Original NASA ASRS Text
Title: AN ACR MD80 FOUND A DISAGREEMENT BTWN ITS OMEGA NAV AND ITS VORS. TRACK HEADING DEV.
Narrative: ON BOWIE ONE ARR. WE WERE PROCEEDING ON THE TUL 209 DEG RADIAL. FO WAS ON TUL AND I WAS ON UKW. ACCORDING TO OMEGA, WE WERE R OF TRACK 4-5 MI BUT FO'S VOR RADIAL WAS CTRED. I SWITCHED OVER TO TULSA AND INDEED THE 2 VORS WERE OFF. WE ASKED ZFW WHERE THEY HAD US AND THEY SAID WE WERE 7-8 MI R OF COURSE BY THIS TIME. AFTER THE TURN AT UKW, BOTH VORS WERE TOGETHER AGAIN. NO OTHER VOR ABNORMALITIES. ONLY THING I COULD THINK OF WAS MAYBE THERE WAS SOMEONE USING AN FM RADIO IN THE BACK. IT WAS LATE AND I DID NOT THINK OF THIS UNTIL LATER. WE TRIPLE CHKED FREQS AND RADIALS WITH NO APPARENT REASON FOR THE DEV.
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.