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An md-11 flight crew was surprised when the aircraft entered a climbing right turn and the autothrottles advanced commensurately when the approach/land mode autoflight mode was selected. They disconnected the autopilot and autothrottles but gained nearly 1;000 ft before regaining flight path control.
| Attributes | |
| ACN | 1030005 |
| Time | |
| Date | 201207 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | MD-11 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Route In Use | Visual Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autoflight System |
| Person 1 | |
| Function | Pilot Not Flying |
| Experience | Flight Crew Last 90 Days 67 Flight Crew Total 5000 Flight Crew Type 1600 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter Loss Of Aircraft Control |
Narrative:
We were in level flight at 3;000 MSL when cleared for a visual approach to 17R. When the captain selected approach/land mode the aircraft started an uncommanded high pitch/high power right turn. The captain re-selected 3;000 ft; but we continued the high power/high pitch turn. The captain disconnected the autopilot and started a descent with the autothrottles still commanding high power. The first officer selected 2;800 ft in control panel multiple times but the autothrottles did not respond. The captain then disconnected the autothrottles. Landing was uneventful; but the aircraft had climbed to nearly 4;000 ft before we regained control.
Original NASA ASRS Text
Title: An MD-11 flight crew was surprised when the aircraft entered a climbing right turn and the autothrottles advanced commensurately when the approach/land mode autoflight mode was selected. They disconnected the autopilot and autothrottles but gained nearly 1;000 FT before regaining flight path control.
Narrative: We were in level flight at 3;000 MSL when cleared for a visual approach to 17R. When the Captain selected approach/land mode the aircraft started an uncommanded high pitch/high power right turn. The Captain re-selected 3;000 FT; but we continued the high power/high pitch turn. The Captain disconnected the autopilot and started a descent with the autothrottles still commanding high power. The First Officer selected 2;800 FT in control panel multiple times but the autothrottles did not respond. The Captain then disconnected the autothrottles. Landing was uneventful; but the aircraft had climbed to nearly 4;000 FT before we regained control.
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.