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A B767 departed an airport not in the FMS database and subsequently became 8 miles off course while following FMS navigation guidance.
| Attributes | |
| ACN | 750405 |
| Time | |
| Date | 200708 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | navaid : dbn.vortac |
| State Reference | GA |
| Altitude | msl single value : 41000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl.artcc tower : zzz.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | instruction : trainee oversight : pic |
| Qualification | pilot : flight engineer pilot : instrument pilot : atp pilot : multi engine pilot : private pilot : commercial |
| Experience | flight time last 90 days : 181 flight time total : 15500 flight time type : 4310 |
| ASRS Report | 750405 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 10000 flight time type : 3000 |
| ASRS Report | 750404 |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : company policies non adherence : published procedure other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued advisory flight crew : returned to intended or assigned course |
| Supplementary | |
| Problem Areas | Company Flight Crew Human Performance Aircraft |
| Primary Problem | Ambiguous |
Narrative:
Our leg entailed a charter flight departing an offline airport. We programmed the FMS and followed all procedures as prescribed by air carrier's operating procedures manual; supplemental section 'FMS preflight for origins/destinations not contained in FMS database.' we departed and climbed up to our cruise altitude of FL410. We were cleared direct dbn by center. After switching to next center; the controller asked if we were proceeding direct dbn. We told him we were. He responded that we were approximately 8 mi off course. We doublechked our FMS. It showed us on course direct dbn. However; as we checked the raw data on the VOR we realized the FMS was off. Either the FMS drifted or we had a map shift. Being unsure of our navigation accuracy; we requested vectors to complete our flight. Rest of flight was uneventful. Supplemental information from acn 750404: map shift/off-line alignment/aircraft malfunction.
Original NASA ASRS Text
Title: A B767 DEPARTED AN ARPT NOT IN THE FMS DATABASE AND SUBSEQUENTLY BECAME 8 MILES OFF COURSE WHILE FOLLOWING FMS NAV GUIDANCE.
Narrative: OUR LEG ENTAILED A CHARTER FLT DEPARTING AN OFFLINE ARPT. WE PROGRAMMED THE FMS AND FOLLOWED ALL PROCS AS PRESCRIBED BY ACR'S OPERATING PROCS MANUAL; SUPPLEMENTAL SECTION 'FMS PREFLT FOR ORIGINS/DESTS NOT CONTAINED IN FMS DATABASE.' WE DEPARTED AND CLBED UP TO OUR CRUISE ALT OF FL410. WE WERE CLRED DIRECT DBN BY CTR. AFTER SWITCHING TO NEXT CTR; THE CTLR ASKED IF WE WERE PROCEEDING DIRECT DBN. WE TOLD HIM WE WERE. HE RESPONDED THAT WE WERE APPROX 8 MI OFF COURSE. WE DOUBLECHKED OUR FMS. IT SHOWED US ON COURSE DIRECT DBN. HOWEVER; AS WE CHKED THE RAW DATA ON THE VOR WE REALIZED THE FMS WAS OFF. EITHER THE FMS DRIFTED OR WE HAD A MAP SHIFT. BEING UNSURE OF OUR NAV ACCURACY; WE REQUESTED VECTORS TO COMPLETE OUR FLT. REST OF FLT WAS UNEVENTFUL. SUPPLEMENTAL INFO FROM ACN 750404: MAP SHIFT/OFF-LINE ALIGNMENT/ACFT MALFUNCTION.
Data retrieved from NASA's ASRS site as of January 2009 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.