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A321 flight crew reported overshooting a crossing restriction after being distracted by wake turbulence and changes to the ATC clearance.
| Attributes | |
| ACN | 1456383 |
| Time | |
| Date | 201706 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | SCT.TRACON |
| State Reference | CA |
| Aircraft 1 | |
| Make Model Name | A321 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Route In Use | STAR HLYWD1 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Heavy Transport |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Altitude Crossing Restriction Not Met Deviation - Altitude Overshoot Deviation - Procedural Clearance Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
I was the pilot flying. We were given a descend via the arrival instruction except to maintain .78 mach. This was then changed to cross a fix at or below 18000'; maintain speed with caution following a heavy. I changed the constraint at the fix to 17000' to ensure the crossing. The whole way [we were] getting into and out of the wake from the heavy in front of us. To ease out of the wake and to comply with altitude; I switched from managed to vertical speed and we crossed just below FL180 as requested.the next fix was 7.2 miles away with a hard altitude of 17000'; we encountered more wake with roll and I used the vsi to get out of it again. We were out of the wake. I missed not getting out of vertical speed mode and sending it to manage. I recognized this just before crossing the fix four hundred feet low and started to correct. ATC issued [descend to] 14;000' at the same time.I set 14;000' and continued to descend with no further issue.in dealing with the change in the arrival to go fast & cross at a different altitude; while dealing with the wake of the previous aircraft I was put into the yellow. Hindsight says I should have done the obvious by asking for some relief and to verbalize (I can't remember if I did or not but I definitely will next time) my exiting managed mode and going to vertical speed.
Original NASA ASRS Text
Title: A321 flight crew reported overshooting a crossing restriction after being distracted by wake turbulence and changes to the ATC clearance.
Narrative: I was the pilot flying. We were given a descend via the arrival instruction except to maintain .78 Mach. This was then changed to cross a fix at or below 18000'; maintain speed with caution following a heavy. I changed the constraint at the fix to 17000' to ensure the crossing. The whole way [we were] getting into and out of the wake from the heavy in front of us. To ease out of the wake and to comply with altitude; I switched from managed to vertical speed and we crossed just below FL180 as requested.The next fix was 7.2 miles away with a hard altitude of 17000'; we encountered more wake with roll and I used the VSI to get out of it again. We were out of the wake. I missed not getting out of vertical speed mode and sending it to manage. I recognized this just before crossing the fix four hundred feet low and started to correct. ATC issued [descend to] 14;000' at the same time.I set 14;000' and continued to descend with no further issue.In dealing with the change in the arrival to go fast & cross at a different altitude; while dealing with the wake of the previous aircraft I was put into the yellow. Hindsight says I should have done the obvious by asking for some relief and to verbalize (I can't remember if I did or not but I definitely will next time) my exiting managed mode and going to vertical speed.
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.