B757 flight crew reported 'severe' wake turbulence in trail of an A380 on the HYPER5 arrival to iad.

Narrative:

The incident occurred at 300 KIAS on the HYPER5 arrival approximately 15 miles north of tukrr at approximately 30;500 feet while descending to FL280. We were in clear VMC conditions; with no forecast or potentially obvious indications of upcoming turbulence. The seat belt sign was off. At the time of the event; the aircraft experienced an uncommanded large vertical up and down motion and simultaneous right bank of approximately 30 degrees. I was the pilot flying and the autopilot was on at the time of the event. I immediately disengaged the autopilot and returned the aircraft to a safe state and back on the intended path. The captain immediately turned on the seat belt sign; reported the event to ATC; and contacted the cabin crew to assess injuries. The ATC controller upon hearing of the event reported that there were no previous reported incidents in the area; and suggested that the event may have been a wake turbulence encounter from the preceding A380 (super category aircraft; approximately 10 miles in front of us on the same arrival). Based on the characteristics of the encounter we agreed with that assessment.initial reports from the cabin crew indicated that all crew and passengers were unharmed; however subsequent reports after further query by the captain indicated that one of the flight attendants had hit her head and sustained a wrist injury. In addition; during passenger deplaning; we were informed that a passenger had sustained a knee injury. Once informed of the injuries; the captain informed dispatch and ATC and requested that emergency medical services (EMS) meet the aircraft at the gate. Declaring an emergency was discussed by the captain and I; but deemed unnecessary given the nature of the injuries and because ATC was already giving us an appropriate degree of traffic priority; and EMS meeting us at the gate had already been coordinated through dispatch and ATC. The subsequent approach and landing were uneventful. We taxied to the gate and EMS met the aircraft. Post flight procedures were normal and uneventful and we informed operations and the [flight operations manager]; as well as following up with queries from potomac approach and station maintenance.

Original NASA ASRS Text

Title: B757 flight crew reported 'severe' wake turbulence in trail of an A380 on the HYPER5 Arrival to IAD.

Narrative: The incident occurred at 300 KIAS on the HYPER5 arrival approximately 15 Miles north of TUKRR at approximately 30;500 feet while descending to FL280. We were in clear VMC conditions; with no forecast or potentially obvious indications of upcoming turbulence. The seat belt sign was off. At the time of the event; the aircraft experienced an uncommanded large vertical up and down motion and simultaneous right bank of approximately 30 degrees. I was the pilot flying and the autopilot was on at the time of the event. I immediately disengaged the autopilot and returned the aircraft to a safe state and back on the intended path. The Captain immediately turned on the seat belt sign; reported the event to ATC; and contacted the cabin crew to assess injuries. The ATC controller upon hearing of the event reported that there were no previous reported incidents in the area; and suggested that the event may have been a wake turbulence encounter from the preceding A380 (super category aircraft; approximately 10 miles in front of us on the same arrival). Based on the characteristics of the encounter we agreed with that assessment.Initial reports from the cabin crew indicated that all crew and passengers were unharmed; however subsequent reports after further query by the Captain indicated that one of the flight attendants had hit her head and sustained a wrist injury. In addition; during passenger deplaning; we were informed that a passenger had sustained a knee injury. Once informed of the injuries; the Captain informed dispatch and ATC and requested that emergency medical services (EMS) meet the aircraft at the gate. Declaring an emergency was discussed by the Captain and I; but deemed unnecessary given the nature of the injuries and because ATC was already giving us an appropriate degree of traffic priority; and EMS meeting us at the gate had already been coordinated through dispatch and ATC. The subsequent approach and landing were uneventful. We taxied to the gate and EMS met the aircraft. Post flight procedures were normal and uneventful and we informed operations and the [flight operations manager]; as well as following up with queries from Potomac Approach and Station Maintenance.

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.

Attributes
ACN	1272493
Time
Date	201506
Local Time Of Day	1201-1800
Place
Locale Reference	ZNY.ARTCC
State Reference	NY
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR HYPER5 Arrival
Flight Plan	IFR
Aircraft 2
Make Model Name	A380
Flight Phase	Descent
Route In Use	STAR HYPER5 Arrival
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Experience	Flight Crew Last 90 Days 193 Flight Crew Total 7430 Flight Crew Type 384
Person 2
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 170 Flight Crew Type 1586
Events
Anomaly	Flight Deck / Cabin / Aircraft Event Illness Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Wake Vortex Encounter