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An air carrier flight crew navigating from FMS input has the FMS mode inadvertently change to heading mode and they get off course on the arrival.
| Attributes | |
| ACN | 332640 |
| Time | |
| Date | 199604 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : anc |
| State Reference | AK |
| Altitude | msl bound lower : 12000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zan tower : fcm |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : flight engineer pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 20000 flight time type : 1500 |
| ASRS Report | 332640 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 5500 flight time type : 240 |
| ASRS Report | 332585 |
| Events | |
| Anomaly | non adherence : clearance non adherence : far non adherence : published procedure other anomaly other other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Aircraft was naved on FMS. FMS/heading select switch somehow was turned off and aircraft was on a heading that would have missed tager X 5 NM to the east. At above 55 DME on anc VOR (anc 332/32) to the east of where we were supposed to be zan gave us a heading for traffic. We were off course.
Original NASA ASRS Text
Title: AN ACR FLC NAVING FROM FMS INPUT HAS THE FMS MODE INADVERTENTLY CHANGE TO HDG MODE AND THEY GET OFF COURSE ON THE ARR.
Narrative: ACFT WAS NAVED ON FMS. FMS/HDG SELECT SWITCH SOMEHOW WAS TURNED OFF AND ACFT WAS ON A HDG THAT WOULD HAVE MISSED TAGER X 5 NM TO THE E. AT ABOVE 55 DME ON ANC VOR (ANC 332/32) TO THE E OF WHERE WE WERE SUPPOSED TO BE ZAN GAVE US A HDG FOR TFC. WE WERE OFF COURSE.
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.