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An unexpected reaction by the autopilot on an RNAV departure was quickly corrected when the flying pilot disengaged the autopilot.
| Attributes | |
| ACN | 881602 |
| Time | |
| Date | 201003 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | CLT.Airport |
| State Reference | NC |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb Initial Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Total 13000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
Loaded flight plan in FMS. As pilot not flying; departed 18L buckl RNAV departure; first fix hisor. Engaged auto-pilot for pilot flying during review of climb checklist. Aircraft banked to unusual course correction. Pilot flying disengaged the autopilot and returned to course direct hisor. Further discussion with departure on phone indicated a course deviation but not outside parameters for departures on buckl. A communication from our union advised this anomaly will be corrected by a reprogramming of the FMS database logic to prevent taking a more aggressive intercept angle when reaching the target altitude early; and thus creating a potential RNAV deviation.
Original NASA ASRS Text
Title: An unexpected reaction by the autopilot on an RNAV departure was quickly corrected when the flying pilot disengaged the autopilot.
Narrative: Loaded flight plan in FMS. As pilot not flying; departed 18L BUCKL RNAV departure; first fix HISOR. Engaged Auto-Pilot for pilot flying during review of Climb checklist. Aircraft banked to unusual course correction. Pilot flying disengaged the autopilot and returned to course direct HISOR. Further discussion with departure on phone indicated a course deviation but not outside parameters for departures on BUCKL. A communication from our union advised this anomaly will be corrected by a reprogramming of the FMS database logic to prevent taking a more aggressive intercept angle when reaching the target altitude early; and thus creating a potential RNAV deviation.
Data retrieved from NASA's ASRS site as of April 2012 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.