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Emb first officer reported a track deviation occurred on arrival into iah when a wake encounter caused an autopilot lateral mode trip off.
| Attributes | |
| ACN | 1630394 |
| Time | |
| Date | 201903 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | IAH.Airport |
| State Reference | TX |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Embraer Jet Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | Descent |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument |
| Events | |
| Anomaly | Deviation - Procedural Clearance Deviation - Track / Heading All Types Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
While on the arrival into iah we were descending through 10;000 feet and started making a turn. Autopilot was on vertical speed and LNAV. We then went through some unexpected wake turbulence. Lateral mode then kicked off; due to the turbulence; vertical mode was still on though causing us to overfly the turn. I hit navigation mode again and it recaptured but it was using a shallow bank (less than 15 degrees). The captain then suggested steepening the bank. I then used tcs mode and steepened the bank to get back on course. At this point ATC gave us a heading and we explained what had happened to them. Some threats that were involved include high work load; we were slowing down turning and coming through 10;000 feet. It was fairly smooth; so we were not expecting any wake or turbulence. After lateral mode turned off we fixed the problem as quickly as possible. Some things I learned is that we could have informed ATC after the turbulence happened.
Original NASA ASRS Text
Title: EMB First Officer reported a track deviation occurred on arrival into IAH when a wake encounter caused an autopilot lateral mode trip off.
Narrative: While on the arrival into IAH we were descending through 10;000 feet and started making a turn. Autopilot was on vertical speed and LNAV. We then went through some unexpected wake turbulence. Lateral mode then kicked off; due to the turbulence; vertical mode was still on though causing us to overfly the turn. I hit NAV mode again and it recaptured but it was using a shallow bank (less than 15 degrees). The Captain then suggested steepening the bank. I then used TCS mode and steepened the bank to get back on course. At this point ATC gave us a heading and we explained what had happened to them. Some threats that were involved include high work load; we were slowing down turning and coming through 10;000 feet. It was fairly smooth; so we were not expecting any wake or turbulence. After lateral mode turned off we fixed the problem as quickly as possible. Some things I learned is that we could have informed ATC after the turbulence happened.
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.