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Air carrier flight crew reported an altitude deviation due to the aircraft going into vertical speed mode for the descent after deviating for weather.
| Attributes | |
| ACN | 1756247 |
| Time | |
| Date | 202008 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.TRACON |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument |
| Events | |
| Anomaly | Conflict Airborne Conflict Deviation - Altitude Overshoot Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types Inflight Event / Encounter Weather / Turbulence |
Narrative:
Descending via the zzzzz into ZZZ there was a small buildup near the ZZZZZ1 waypoint. The captain deviated just a few degrees to the west of it then proceeded back on course via the zzzzz arrival. A few moments later ATC told us to stop the descent immediately because of traffic. I looked up and saw that we were at about 8;580 feet about five miles prior to ZZZZZ2 waypoint. ZZZZZ2 has a restriction of 9;000 feet. We leveled and began the climb back up to 9;000 feet; of which I informed ATC. ATC asked us what happened and the captain explained the situation. By selecting heading for those few degrees to get around the buildup; the airplane went into vertical speed mode for the descent. Neither of us caught it.I was a little distracted by looking at arrival information on my ipad. I just didn't realize we were in vertical speed mode. I know that's what happens; but I just didn't catch it.double check the FMA any time changes are made to the different modes of the autopilot.
Original NASA ASRS Text
Title: Air carrier flight crew reported an altitude deviation due to the aircraft going into vertical speed mode for the descent after deviating for weather.
Narrative: Descending via the ZZZZZ into ZZZ there was a small buildup near the ZZZZZ1 waypoint. The Captain deviated just a few degrees to the west of it then proceeded back on course via the ZZZZZ arrival. A few moments later ATC told us to stop the descent immediately because of traffic. I looked up and saw that we were at about 8;580 feet about five miles prior to ZZZZZ2 waypoint. ZZZZZ2 has a restriction of 9;000 feet. We leveled and began the climb back up to 9;000 feet; of which I informed ATC. ATC asked us what happened and the Captain explained the situation. By selecting heading for those few degrees to get around the buildup; the airplane went into vertical speed mode for the descent. Neither of us caught it.I was a little distracted by looking at arrival information on my iPad. I just didn't realize we were in vertical speed mode. I know that's what happens; but I just didn't catch it.Double check the FMA any time changes are made to the different modes of the autopilot.
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.