Narrative:

In solid IMC all the way to ILS minima. Approximately 10nm north east of cho airport we were under positive control by potomac approach and being radar vectored for an ILS to runway 03. At the time we were being vectored on an early right hand pattern downwind for the ILS. We were cleared on a heading and descent to 3000ft MSL.aircraft configuration was clean; autopilot on and coupled to heading and vertical speed. Vs minus 1000ft rate of descent. I can't remember exact airspeed but from memory 200 knots and definitely less than 250knots. Correct local altimeter setting was set. Upon descending through approximately 3400ft MSL to 3000ft cleared by ATC we given a GPWS 'terrain; pull up' audio and matched display on the pfd. Immediately complied with the GPWS; initiated climb. As soon as the pilot flying (first officer) pitched nose up the GPWS warning disappeared.I contacted ATC immediately and informed them of the terrain warning and our actions/intentions. We leveled off at 4000ft and then continued to destination. ATC said that we were ok on original clearance based on their minimum vector altitudes and we shouldn't have received any GPWS warning. I told them that we were in IMC and were required to comply with any GPWS warning in those environmental conditions.subsequently vectored to ILS 03 without further incident. No aircraft limitations were exceeded at any time throughout incident and recovery. Possible that the ATC minimum vector altitudes for that region have too tight margins given the terrain; and/or faulty or erroneous GPWS warning. Aircraft equipment appeared to be operating correctly without fault.aircraft being operated at vertical speed of 1000ft/min rod and normal airspeed range of 200-250kts to a cleared altitude and vector shouldn't have triggered a GPWS warning. I'm not sure what the actual cause for the GPWS was other than the closure to terrain. If the aircraft equipment hasn't has previous erroneous GPWS warnings and was working correctly; then the only thing I can think of is the ATC minimum vector altitude charts might need adjusting.

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Original NASA ASRS Text

Title: EMB-140 flight crew reported a Ground Proximity Warning while descending to an altitude assigned by ATC.

Narrative: In solid IMC all the way to ILS minima. Approximately 10nm north east of CHO airport we were under positive control by Potomac Approach and being radar vectored for an ILS to Runway 03. At the time we were being vectored on an early right hand pattern downwind for the ILS. We were cleared on a heading and descent to 3000ft MSL.Aircraft configuration was clean; autopilot on and coupled to Heading and vertical speed. VS minus 1000ft Rate of Descent. I can't remember exact airspeed but from memory 200 knots and definitely less than 250knots. Correct local altimeter setting was set. Upon descending through approximately 3400ft MSL to 3000ft cleared by ATC we given a GPWS 'terrain; pull up' audio and matched display on the PFD. Immediately complied with the GPWS; initiated climb. As soon as the Pilot flying (FO) pitched nose up the GPWS warning disappeared.I contacted ATC immediately and informed them of the terrain warning and our actions/intentions. We leveled off at 4000ft and then continued to destination. ATC said that we were OK on original clearance based on their minimum vector altitudes and we shouldn't have received any GPWS warning. I told them that we were in IMC and were required to comply with any GPWS warning in those environmental conditions.Subsequently vectored to ILS 03 without further incident. No aircraft limitations were exceeded at any time throughout incident and recovery. Possible that the ATC minimum vector altitudes for that region have too tight margins given the terrain; and/or faulty or erroneous GPWS warning. Aircraft equipment appeared to be operating correctly without fault.Aircraft being operated at vertical speed of 1000ft/min ROD and normal airspeed range of 200-250kts to a cleared altitude and vector shouldn't have triggered a GPWS warning. I'm not sure what the actual cause for the GPWS was other than the closure to terrain. If the aircraft equipment hasn't has previous erroneous GPWS warnings and was working correctly; then the only thing I can think of is the ATC minimum vector altitude charts might need adjusting.

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.