Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Last 90 Days 180; Flight Crew Type 16000
Situational Awareness; Distraction
Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Wake Vortex Encounter
Flight Crew Became Reoriented; Flight Crew Returned To Clearance
Environment - Non Weather Related; Human Factors; Procedure
We were descending on the BRUSR 1 arrival. We had an Airbus A320 approximately seven miles ahead of us. We encountered some wake turbulence from the A320 a few times while following him on the arrival. During the last encounter; our aircraft started to roll a bit quicker left and right due to the wake turbulence. I guarded the controls in case our aircraft rolled too far.We continued on the arrival; and I noticed we were slightly off course. I looked at the FMA and noticed the amber control wheel steering roll mode annunciated. Somehow the LNAV disengaged so I re-engaged it. I'm sure it happened as a result of the wake turbulence. The aircraft intercepted the course; and we continued on the arrival. I did not think we were off course by much or very long. We had multiple speed reductions assigned to us due to compression during this event. I think I lost some situational awareness while trying to get the aircraft slowed up while staying on path. One last thing is that we did have a decent tailwind on the arrival. That can increase the chance of this kind of hazard.
Encountered wake turbulence on arrival. Due to wake turbulence; automation changed from LNAV/VNAV to VNAV/control wheel steering roll. Pilot flying controlled the aircraft. We discussed mode switch and reset desired mode once out of wake turbulence. Approach asked if we were off arrival; which we were not.
B737-700 flight crew reported encountering wake turbulence on arrival into PHX in trail of an A320 that resulted in the temporary loss of LNAV.