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A B757 flying in ZJX airspace, loses the navigation ground track from the FMC and begins to wander off the flight plan course.
| Attributes | |
| ACN | 375110 |
| Time | |
| Date | 199707 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : chs |
| State Reference | SC |
| Altitude | msl bound lower : 39000 msl bound upper : 39000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 60 flight time total : 18000 flight time type : 400 |
| ASRS Report | 375110 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : clearance other spatial deviation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
FMC loaded and verified route by both captain and first officer. After passing chs, FMC apparently deleted J79, uncommanded, and aircraft proceeded direct toward omn, which would penetrate a warning area. After passing chs (within 10 mi), center controller noticed aircraft route deviation and vectored flight back onto J79. Captain and first officer at a loss to explain why FMC dropped J79 (from chs to omn) from database.
Original NASA ASRS Text
Title: A B757 FLYING IN ZJX AIRSPACE, LOSES THE NAV GND TRACK FROM THE FMC AND BEGINS TO WANDER OFF THE FLT PLAN COURSE.
Narrative: FMC LOADED AND VERIFIED RTE BY BOTH CAPT AND FO. AFTER PASSING CHS, FMC APPARENTLY DELETED J79, UNCOMMANDED, AND ACFT PROCEEDED DIRECT TOWARD OMN, WHICH WOULD PENETRATE A WARNING AREA. AFTER PASSING CHS (WITHIN 10 MI), CTR CTLR NOTICED ACFT RTE DEV AND VECTORED FLT BACK ONTO J79. CAPT AND FO AT A LOSS TO EXPLAIN WHY FMC DROPPED J79 (FROM CHS TO OMN) FROM DATABASE.
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.