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Falcon 50 flight crew fails to set their FMS properly before departure and experiences a heading track deviation during a premature turn 40 NM from czq VOR.
| Attributes | |
| ACN | 515980 |
| Time | |
| Date | 200106 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : czq.vortac |
| State Reference | CA |
| Altitude | msl single value : 14000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : o90.tracon |
| Operator | general aviation : corporate |
| Make Model Name | Falcon 50 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : n/s |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 6400 flight time type : 500 |
| ASRS Report | 515980 |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : company policies non adherence : published procedure other anomaly other other spatial deviation |
| Resolutory Action | controller : issued advisory controller : issued new clearance flight crew : returned to original clearance flight crew : overcame equipment problem flight crew : overrode automation flight crew : became reoriented |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On climb out through 14000 ft, received multiple messages on FMS indicating position (FMS) IRS error. As we began to investigate, the aircraft began to turn direct to oal VOR. The turn was supposed to begin at czq VOR, but DME indicated we were still 40 mi north of czq. I asked the copilot to re-initialize her FMS, and shortly thereafter, she mentioned her FMS now indicated we were not yet at czq. This is when ATC asked us to make a right turn back direct to czq. At this point, I went to 'raw data' and when I was established on course, found that the IRS position differed from the GPS by 40 NM! The FMS was initialized by the IRS, therefore, it was also 40 NM off. I was not present during IRS/FMS initialization and did not catch the discrepancy after engine start (that's when I finished the passenger brief and sat in my seat). I will always check FMS position prior to taxi.
Original NASA ASRS Text
Title: FALCON 50 FLT CREW FAILS TO SET THEIR FMS PROPERLY BEFORE DEP AND EXPERIENCES A HDG TRACK DEV DURING A PREMATURE TURN 40 NM FROM CZQ VOR.
Narrative: ON CLBOUT THROUGH 14000 FT, RECEIVED MULTIPLE MESSAGES ON FMS INDICATING POS (FMS) IRS ERROR. AS WE BEGAN TO INVESTIGATE, THE ACFT BEGAN TO TURN DIRECT TO OAL VOR. THE TURN WAS SUPPOSED TO BEGIN AT CZQ VOR, BUT DME INDICATED WE WERE STILL 40 MI N OF CZQ. I ASKED THE COPLT TO RE-INITIALIZE HER FMS, AND SHORTLY THEREAFTER, SHE MENTIONED HER FMS NOW INDICATED WE WERE NOT YET AT CZQ. THIS IS WHEN ATC ASKED US TO MAKE A R TURN BACK DIRECT TO CZQ. AT THIS POINT, I WENT TO 'RAW DATA' AND WHEN I WAS ESTABLISHED ON COURSE, FOUND THAT THE IRS POS DIFFERED FROM THE GPS BY 40 NM! THE FMS WAS INITIALIZED BY THE IRS, THEREFORE, IT WAS ALSO 40 NM OFF. I WAS NOT PRESENT DURING IRS/FMS INITIALIZATION AND DID NOT CATCH THE DISCREPANCY AFTER ENG START (THAT'S WHEN I FINISHED THE PAX BRIEF AND SAT IN MY SEAT). I WILL ALWAYS CHK FMS POS PRIOR TO TAXI.
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.