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SF340 flight crew experiences FMS failure shortly after departure; then a right recirculation fan fault en route. While attempting to navigate using the autopilot to track the VOR CDI; a course deviation occurs for unknown reasons.
| Attributes | |
| ACN | 971280 |
| Time | |
| Date | 201109 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | BDR.VOR |
| State Reference | CT |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Saab 340 Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Commercial |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
While flying in cruise; the FMS failed and then we had a recirculation fan fail. As we were working with both of these; we were given a heading to intercept an airway. We were about 20 miles from bdr VOR and when I selected navigation mode after selecting the heading to intercept we had full scale deflection to the right and the airplane turned left. We were both busy trying to figure out what was going on with the airplane and we overflew a waypoint. ATC called and told us we had over flown the waypoint; then gave us a vector to the next waypoint. As far as we know there were no conflicts with other traffic. Nothing was close to us on TCAS.the FMS had been written up in the log and signed off as fixed. The recirculation fan had also been written up in the same book and signed off as fixed. This all happened in about the same area [where] SF340 crews are always getting false capture of the localizer for runway 22. It was very busy with all this going on at one time. We could have asked for a heading until we had some of these things under control. The workload was very high at this time.
Original NASA ASRS Text
Title: SF340 flight crew experiences FMS failure shortly after departure; then a right recirculation fan fault en route. While attempting to navigate using the autopilot to track the VOR CDI; a course deviation occurs for unknown reasons.
Narrative: While flying in cruise; the FMS failed and then we had a recirculation fan fail. As we were working with both of these; we were given a heading to intercept an airway. We were about 20 miles from BDR VOR and when I selected NAV mode after selecting the heading to intercept we had full scale deflection to the right and the airplane turned left. We were both busy trying to figure out what was going on with the airplane and we overflew a waypoint. ATC called and told us we had over flown the waypoint; then gave us a vector to the next waypoint. As far as we know there were no conflicts with other traffic. Nothing was close to us on TCAS.The FMS had been written up in the log and signed off as fixed. The recirculation fan had also been written up in the same book and signed off as fixed. This all happened in about the same area [where] SF340 crews are always getting false capture of the LOC for Runway 22. It was very busy with all this going on at one time. We could have asked for a heading until we had some of these things under control. The workload was very high at this time.
Data retrieved from NASA's ASRS site as of April 2012 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.