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E145 departing dfw on RNAV SID receives conflicting track information from unmarried FMS systems. Require ATC vectors while correcting problem.
| Attributes | |
| ACN | 675350 |
| Time | |
| Date | 200510 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : d10.tracon |
| State Reference | TX |
| Aircraft 1 | |
| Controlling Facilities | tracon : d10.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other Other |
| Flight Phase | climbout : initial |
| Route In Use | departure sid : nobly |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial |
| ASRS Report | 675350 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 675329 |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : published procedure non adherence : clearance other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | aircraft : equipment problem dissipated controller : issued new clearance flight crew : returned to intended or assigned course |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance Chart Or Publication |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
When departure runway 17R at dfw for ZZZ using the nobly 2 SID we received an incorrect turn on the flight director. Just after we had position rate gear up; select heading; select navigation the flight director started a left turn towards the east. The captain and the first officer had conflicting information on their FMS's. The only people involved were myself the captain and ATC. At the same time ATC asked us about why we were in a turn we noticed that both of the FMS were showing a position uncertain message; indicating they were not getting reliable information from the GPS and started showing an early turn. We had not noticed any abnormalities with the FMS on the before takeoff check. ATC gave us radar vectors to proceed on course. Soon after the number 2 FMS position message went away and it seemed to have no more problems with the flight.
Original NASA ASRS Text
Title: E145 DEPARTING DFW ON RNAV SID RECEIVES CONFLICTING TRACK INFO FROM UNMARRIED FMS SYSTEMS. REQUIRE ATC VECTORS WHILE CORRECTING PROB.
Narrative: WHEN DEP RWY 17R AT DFW FOR ZZZ USING THE NOBLY 2 SID WE RECEIVED AN INCORRECT TURN ON THE FLT DIRECTOR. JUST AFTER WE HAD POS RATE GEAR UP; SELECT HEADING; SELECT NAV THE FLT DIRECTOR STARTED A L TURN TOWARDS THE E. THE CAPT AND THE FO HAD CONFLICTING INFO ON THEIR FMS'S. THE ONLY PEOPLE INVOLVED WERE MYSELF THE CAPT AND ATC. AT THE SAME TIME ATC ASKED US ABOUT WHY WE WERE IN A TURN WE NOTICED THAT BOTH OF THE FMS WERE SHOWING A POS UNCERTAIN MESSAGE; INDICATING THEY WERE NOT GETTING RELIABLE INFO FROM THE GPS AND STARTED SHOWING AN EARLY TURN. WE HAD NOT NOTICED ANY ABNORMALITIES WITH THE FMS ON THE BEFORE TKOF CHK. ATC GAVE US RADAR VECTORS TO PROCEED ON COURSE. SOON AFTER THE NUMBER 2 FMS POSITION MESSAGE WENT AWAY AND IT SEEMED TO HAVE NO MORE PROBS WITH THE FLT.
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.