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A DC10 freighter deviated from intended and assigned course due to unwanted back input caused by a failed autoplt.
| Attributes | |
| ACN | 492030 |
| Time | |
| Date | 200010 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : czqx.airport |
| State Reference | NF |
| Altitude | msl single value : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : czqx.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Route In Use | enroute : atlantic |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : multi engine pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 150 flight time total : 1550 flight time type : 750 |
| ASRS Report | 492030 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : #1 + #2 hsi indications other flight crewa |
| Resolutory Action | flight crew : returned to intended or assigned course flight crew : returned to assigned airspace |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
While in cruise at FL310 over the north atlantic we experienced an autoplt malfunction that resulted in a right bank of 1 or 2 degrees that was not detected by the crew. The captain noticed the sun was not where it should be. He selected heading select which had no effect. We selected the other autoplt and returned to our desired track. The flight mode annunciators displayed INS track. We informed gander center of our equipment malfunction. The rest of the flight was without incidence.
Original NASA ASRS Text
Title: A DC10 FREIGHTER DEVIATED FROM INTENDED AND ASSIGNED COURSE DUE TO UNWANTED BACK INPUT CAUSED BY A FAILED AUTOPLT.
Narrative: WHILE IN CRUISE AT FL310 OVER THE NORTH ATLANTIC WE EXPERIENCED AN AUTOPLT MALFUNCTION THAT RESULTED IN A R BANK OF 1 OR 2 DEGS THAT WAS NOT DETECTED BY THE CREW. THE CAPT NOTICED THE SUN WAS NOT WHERE IT SHOULD BE. HE SELECTED HEADING SELECT WHICH HAD NO EFFECT. WE SELECTED THE OTHER AUTOPLT AND RETURNED TO OUR DESIRED TRACK. THE FLT MODE ANNUNCIATORS DISPLAYED INS TRACK. WE INFORMED GANDER CTR OF OUR EQUIP MALFUNCTION. THE REST OF THE FLT WAS WITHOUT INCIDENCE.
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.