Emb-145 first officer reported encountering wake turbulence on arrival into phl.

Attributes
ACN	1545271
Time
Date	201805
Local Time Of Day	1201-1800
Place
Locale Reference	PHL.Airport
State Reference	PA
Environment
Light	Daylight
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
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 Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Events
Anomaly	Deviation - Procedural Published Material / Policy Inflight Event / Encounter Wake Vortex Encounter

Narrative:

The aircraft rolled suddenly as a result of turbulence; twice; the autopilot remained engaged. ATC issued an offset; since wake turbulence was suspected. The distraction; which occurred as the pilot monitoring (pm) was working through a runway change as we descended via; led to the delayed completion of the descent checklist.ATC offered an offset left off course; which we accepted. The pm made an announcement to the cabin and programmed the offset. The pilot flying made a heading change in the direction of the issued offset. The descent checklist was completed prior to glide-slope intercept.

Original NASA ASRS Text

Title: EMB-145 First Officer reported encountering wake turbulence on arrival into PHL.

Narrative: The aircraft rolled suddenly as a result of turbulence; twice; the autopilot remained engaged. ATC issued an offset; since wake turbulence was suspected. The distraction; which occurred as the Pilot Monitoring (PM) was working through a runway change as we descended via; led to the delayed completion of the descent checklist.ATC offered an offset left off course; which we accepted. The PM made an announcement to the cabin and programmed the offset. The Pilot Flying made a heading change in the direction of the issued offset. The descent checklist was completed prior to glide-slope intercept.

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.