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Air carrier medium large transport banks over 30 degrees after being established on the localizer with autoplt coupled. No apparent reason for the maneuver.
| Attributes | |
| ACN | 137193 |
| Time | |
| Date | 199002 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : dfw |
| State Reference | TX |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : dfw tower : roa |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | ils localizer & glide slope : bxn |
| Flight Phase | descent : approach |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 225 flight time total : 10000 flight time type : 2500 |
| ASRS Report | 137193 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : published procedure other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
After normal approach and localizer capture autoplt and F/D coupled first officer flying autoplt induced sharp 30 degree bank away from localizer; maneuver to return to course manually brought aircraft to edge of localizer course on simultaneous traffic side. Conferring with all interested parties still unsure of source of failure.
Original NASA ASRS Text
Title: ACR MLG BANKS OVER 30 DEGREES AFTER BEING ESTABLISHED ON THE LOC WITH AUTOPLT COUPLED. NO APPARENT REASON FOR THE MANEUVER.
Narrative: AFTER NORMAL APCH AND LOC CAPTURE AUTOPLT AND F/D COUPLED F/O FLYING AUTOPLT INDUCED SHARP 30 DEG BANK AWAY FROM LOC; MANEUVER TO RETURN TO COURSE MANUALLY BROUGHT ACFT TO EDGE OF LOC COURSE ON SIMULTANEOUS TFC SIDE. CONFERRING WITH ALL INTERESTED PARTIES STILL UNSURE OF SOURCE OF FAILURE.
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.