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A B757 deviated from assigned track because the flight crew had entered incorrect present position information in the FMC at the gate prior to departure.
| Attributes | |
| ACN | 713915 |
| Time | |
| Date | 200610 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : ptw.vortac |
| State Reference | PA |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : phl.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : initial |
| Route In Use | departure sid : n/s |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : instrument pilot : flight engineer pilot : atp pilot : cfi pilot : commercial |
| Experience | flight time last 90 days : 100 flight time total : 13000 flight time type : 500 |
| ASRS Report | 713915 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : published procedure non adherence : clearance other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance controller : provided flight assist flight crew : overcame equipment problem flight crew : returned to intended or assigned course |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Departing from phl to las on a clear afternoon we were directed to fly direct to the ptw VOR. So we entered ptw into FMC and LNAV direct to ptw. ATC asked us if we were proceeding direct ptw. We replied yes and rechked our FMC and map mode and it indicated direct ptw. However; ATC informed us we were 20 degrees to the right and to turn direct. We then went raw data ptw VOR and realized the FMC position for ptw was approximately 8 mi to the right of the real position. We then proceeded to use raw data VOR navigation to our destination. 3 hours later the FMC had corrected and was correct. First officer and I determined that our original position of phl was entered incorrectly into FMC and was off by 8 mi initially. Human factors at the gate were captain in a hurry and not xchking FMC position coordinates after the first officer entered them. Also on taxi-out both pilots failed to check the airport location symbol on our moving map display to be on the phl runway 27L.
Original NASA ASRS Text
Title: A B757 DEVIATED FROM ASSIGNED TRACK BECAUSE THE FLT CREW HAD ENTERED INCORRECT PRESENT POS INFO IN THE FMC AT THE GATE PRIOR TO DEP.
Narrative: DEPARTING FROM PHL TO LAS ON A CLR AFTERNOON WE WERE DIRECTED TO FLY DIRECT TO THE PTW VOR. SO WE ENTERED PTW INTO FMC AND LNAV DIRECT TO PTW. ATC ASKED US IF WE WERE PROCEEDING DIRECT PTW. WE REPLIED YES AND RECHKED OUR FMC AND MAP MODE AND IT INDICATED DIRECT PTW. HOWEVER; ATC INFORMED US WE WERE 20 DEGS TO THE R AND TO TURN DIRECT. WE THEN WENT RAW DATA PTW VOR AND REALIZED THE FMC POS FOR PTW WAS APPROX 8 MI TO THE R OF THE REAL POS. WE THEN PROCEEDED TO USE RAW DATA VOR NAV TO OUR DEST. 3 HRS LATER THE FMC HAD CORRECTED AND WAS CORRECT. FO AND I DETERMINED THAT OUR ORIGINAL POS OF PHL WAS ENTERED INCORRECTLY INTO FMC AND WAS OFF BY 8 MI INITIALLY. HUMAN FACTORS AT THE GATE WERE CAPT IN A HURRY AND NOT XCHKING FMC POS COORDINATES AFTER THE FO ENTERED THEM. ALSO ON TAXI-OUT BOTH PLTS FAILED TO CHK THE ARPT LOCATION SYMBOL ON OUR MOVING MAP DISPLAY TO BE ON THE PHL RWY 27L.
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.