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Emb-145 captain reported a lateral course deviation after their FMS dropped off line.
| Attributes | |
| ACN | 1618807 |
| Time | |
| Date | 201902 |
| Local Time Of Day | 1801-2400 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | EMB ERJ 145 ER/LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
This is not the first time this has happened. We had a lateral deviation [prior to this event] and filed an [ASRS report]. Fortunately this happened at cruise. FMS (flight management) # 2 dropped offline during cruise. Messages on the FMS included: single operation; flight plan drops off; independent mode; ACARS (aircraft communications addressing and reporting system) not init; ACARS does not work on both FMS's; lateral mode is also lost on FMS # 2.on this particular flight there was no deviations but I'm filling out this [ASRS report] to bring attention to all concerned that this is becoming a problem with FMS # 2 just dropping offline for no apparent reason. This has become more frequent since updating a software on the FMS which now requires us to put in the landing airport; OAT (outside air temperature) and altimeter setting to get landing aero data.look into the software update to the FMS to find out what is causing the FMS to go into single mode and especially why the flight plan drops off. A similar incident happen again [recently] and I will be filling out another report.
Original NASA ASRS Text
Title: EMB-145 Captain reported a lateral course deviation after their FMS dropped off line.
Narrative: This is not the first time this has happened. We had a lateral deviation [prior to this event] and filed an [ASRS Report]. Fortunately this happened at cruise. FMS (Flight Management) # 2 dropped offline during cruise. Messages on the FMS included: Single Operation; flight plan drops off; Independent Mode; ACARS (Aircraft Communications Addressing and Reporting System) not INIT; ACARS does not work on both FMS's; Lateral Mode is also lost on FMS # 2.On this particular flight there was no deviations but I'm filling out this [ASRS Report] to bring attention to all concerned that this is becoming a problem with FMS # 2 just dropping offline for no apparent reason. This has become more frequent since updating a software on the FMS which now requires us to put in the landing airport; OAT (Outside Air Temperature) and Altimeter setting to get landing aero data.Look into the software update to the FMS to find out what is causing the FMS to go into single mode and especially why the flight plan drops off. A similar incident happen again [recently] and I will be filling out another report.
Data retrieved from NASA's ASRS site 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.