An md-82 flight crew reported a wake vortex encounter from the preceding B767 on arrival into dfw th...

Narrative:

I was the pilot flying. We were in level flight at FL280 on the byp arrival indicating 310 KTS assigned. We were just inside 10 miles in trail with a boeing 767; as [the B767] flight was cleared to descend through our altitude. The wake turbulence event began with increasing vibration both heard and felt in the controls followed by an uncommanded roll to the right of almost 30 degrees. I disconnected the autopilot and corrected with aileron and slight rudder inputs to regain control of the aircraft. We leveled off momentarily and then continued our descent. The captain called back at this point to check on the flight attendants. They were all seated at the time; as were the passengers; and no injuries were reported. The captain then made a short PA to the passengers to explain the event. As we continued our descent; I slowed the aircraft to 280 KTS and shallowed our descent rate. However; passing through FL260; we encountered a similar wake turbulence event that was handled in the same manner as the first. At this time; I began a turn to the right to get out from behind the preceding aircraft and the captain informed ATC that we had experienced a wake turbulence event and were turning off course. ATC approved the turn and after enough time had elapsed to provide ample divergence between our course and that of the aircraft ahead; we were cleared back to byp and flew the remainder of the arrival. After each event; the controls displayed a slight vibration that lasted for several minutes after the wake turbulence event ended. After a few minutes; the vibrations dissipated and the aircraft flew and operated normally. We reported the event in the [log] and requested an inspection from maintenance to confirm the condition of the aircraft.

Original NASA ASRS Text

Title: An MD-82 flight crew reported a wake vortex encounter from the preceding B767 on arrival into DFW that resulted in an uncommanded 30 degree roll and some flight control vibration that persisted beyond the event.

Narrative: I was the pilot flying. We were in level flight at FL280 on the BYP arrival indicating 310 KTS assigned. We were just inside 10 miles in trail with a Boeing 767; as [the B767] flight was cleared to descend through our altitude. The wake turbulence event began with increasing vibration both heard and felt in the controls followed by an uncommanded roll to the right of almost 30 degrees. I disconnected the autopilot and corrected with aileron and slight rudder inputs to regain control of the aircraft. We leveled off momentarily and then continued our descent. The Captain called back at this point to check on the flight attendants. They were all seated at the time; as were the passengers; and no injuries were reported. The Captain then made a short PA to the passengers to explain the event. As we continued our descent; I slowed the aircraft to 280 KTS and shallowed our descent rate. However; passing through FL260; we encountered a similar wake turbulence event that was handled in the same manner as the first. At this time; I began a turn to the right to get out from behind the preceding aircraft and the Captain informed ATC that we had experienced a wake turbulence event and were turning off course. ATC approved the turn and after enough time had elapsed to provide ample divergence between our course and that of the aircraft ahead; we were cleared back to BYP and flew the remainder of the arrival. After each event; the controls displayed a slight vibration that lasted for several minutes after the wake turbulence event ended. After a few minutes; the vibrations dissipated and the aircraft flew and operated normally. We reported the event in the [log] and requested an inspection from maintenance to confirm the condition of the aircraft.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1001587
Time
Date	201203
Local Time Of Day	1201-1800
Place
Locale Reference	ZFW.ARTCC
State Reference	TX
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	MD-82
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR BYP
Aircraft 2
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Person 1
Function	Pilot Flying First Officer
Person 2
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Inflight Event / Encounter Wake Vortex Encounter

An md-82 flight crew reported a wake vortex encounter from the preceding B767 on arrival into dfw that resulted in an uncommanded 30 degree roll and some flight control vibration that persisted beyond the event.