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CE680 captain reported a track deviation resulted from the aircraft FMS smart turn setting being excessive.
| Attributes | |
| ACN | 1520747 |
| Time | |
| Date | 201801 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZMA.ARTCC |
| State Reference | FL |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Cessna Citation Sovereign (C680) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Descent |
| Route In Use | STAR PRRIE |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 100 Flight Crew Total 12500 Flight Crew Type 600 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
At FL240 and about 15 miles north of wlace I received a clearance to descend to cross wlace at FL190; however at the time of the clearance the FMS switched to the next waypoint which was prrie. I informed the controller that I was past wlace; the airplane was in the smart turn; in which he questioned me about the move as he said I was 15 mile north of wlace and wanted me to cross wlace at FL190. I switched to heading mode to get the airplane to get closer to wlace but was still off course while trying to return on to the arrival. We had a ground speed of 436 knots so I didn't think there was an issue with the turn until the controller questioned me. The first officer was on the radio with the FBO while all this was happening. I would estimate that we were at least 2 miles off course before returning on to the arrival. To my knowledge no other aircraft were required to move because of my error.what I have since found out is; the smart turn setting in the FMS was set to a 15 mile smart turn and has since been reduced to a 4 mile smart turn which should end any issues with an early smart turn on a STAR or SID.
Original NASA ASRS Text
Title: CE680 Captain reported a track deviation resulted from the aircraft FMS smart turn setting being excessive.
Narrative: At FL240 and about 15 miles north of WLACE I received a clearance to descend to cross WLACE at FL190; however at the time of the clearance the FMS switched to the next waypoint which was PRRIE. I informed the Controller that I was past WLACE; the airplane was in the smart turn; in which he questioned me about the move as he said I was 15 mile North of WLACE and wanted me to cross WLACE at FL190. I switched to heading mode to get the airplane to get closer to WLACE but was still off course while trying to return on to the arrival. We had a ground speed of 436 knots so I didn't think there was an issue with the turn until the Controller questioned me. The First Officer was on the radio with the FBO while all this was happening. I would estimate that we were at least 2 miles off course before returning on to the arrival. To my knowledge no other aircraft were required to move because of my error.What I have since found out is; the smart turn setting in the FMS was set to a 15 mile smart turn and has since been reduced to a 4 mile smart turn which should end any issues with an early smart turn on a STAR or SID.
Data retrieved from NASA's ASRS site 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.