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A B737-ng overflying dfw 40 SM south at FL370 had 111.75 selected on the VHF radio heads and the app mode engaged causing a twenty five degree roll right. Dfw ILS 17L/35R frequency is 111.75.
| Attributes | |
| ACN | 1045204 |
| Time | |
| Date | 201210 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Track / Heading All Types |
Narrative:
En route mia approximately 40 SM south of dfw at FL370 experienced 25 degree roll to right. Aircraft was engaged in LNAV and was observed switching to app mode without pilot input (FMC changed lateral modes on its own). Both captain and first officer VHF radios tuned to 111.75 departing. Dfw ILS 17L/35R has same frequency of 111.75. Minimal heading deviation occurred before corrective action taken.
Original NASA ASRS Text
Title: A B737-NG overflying DFW 40 SM south at FL370 had 111.75 selected on the VHF radio heads and the APP MODE engaged causing a twenty five degree roll right. DFW ILS 17L/35R frequency is 111.75.
Narrative: En route MIA approximately 40 SM south of DFW at FL370 experienced 25 degree roll to right. Aircraft was engaged in LNAV and was observed switching to APP mode without pilot input (FMC changed lateral modes on its own). Both Captain and First Officer VHF radios tuned to 111.75 departing. DFW ILS 17L/35R has same frequency of 111.75. Minimal heading deviation occurred before corrective action taken.
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.