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ATC advised an erj flight crew descending via the frdmm RNAV STAR into dca that their track (as well as that of several previous 'company' flights) between wllll and sepii deviated about a mile before rejoining at sepii. The flight crew advised their FMS displays showed them on course with the autopilot engaged in the navigation mode.
| Attributes | |
| ACN | 1043238 |
| Time | |
| Date | 201210 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | DCA.Airport |
| State Reference | DC |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | EMB ERJ 135 ER/LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | ATC Issue All Types Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
During our descent on the frdmm one RNAV arrival; just past wllll; the controller asked us whether we showed ourselves on course for the arrival. I verified that the autopilot was engaged; it was coupled to the right side; and that the first officer was navigating in pink needles with the lateral mode set to navigation. Everything was set up correctly and the mfd depicted us as on course. I then responded that we did show ourselves on course. The controller then informed us that previous company flights; as well as ours; had been flying up to a mile off course and had been rejoining the arrival more precisely at sepii. He explained that; to him; it looked like our planes were flying the course depicted on the eldee 5 RNAV arrival. I asked the controller if he could tell me at what point our plane started to fly off course; but he stated he was not sure. He stated that he would try to figure it out with the next inbound company flight. We continued on the arrival with no further incident.
Original NASA ASRS Text
Title: ATC advised an ERJ flight crew descending via the FRDMM RNAV STAR into DCA that their track (as well as that of several previous 'company' flights) between WLLLL and SEPII deviated about a mile before rejoining at SEPII. The flight crew advised their FMS displays showed them on course with the autopilot engaged in the NAV mode.
Narrative: During our descent on the FRDMM ONE RNAV Arrival; just past WLLLL; the Controller asked us whether we showed ourselves on course for the arrival. I verified that the autopilot was engaged; it was coupled to the right side; and that the First Officer was navigating in pink needles with the lateral mode set to NAV. Everything was set up correctly and the MFD depicted us as on course. I then responded that we did show ourselves on course. The Controller then informed us that previous company flights; as well as ours; had been flying up to a mile off course and had been rejoining the arrival more precisely at SEPII. He explained that; to him; it looked like our planes were flying the course depicted on the ELDEE 5 RNAV Arrival. I asked the Controller if he could tell me at what point our plane started to fly off course; but he stated he was not sure. He stated that he would try to figure it out with the next inbound company flight. We continued on the arrival with no further incident.
Data retrieved from NASA's ASRS site as of July 2013 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.