Emb 145LR first officer reported triggered ground proximity warning system during visual approach.

Attributes
ACN	1692510
Time
Date	201910
Local Time Of Day	1801-2400
Place
Locale Reference	UNV.Airport
State Reference	PA
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Events
Anomaly	Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT

Narrative:

After being cleared for the visual approach I set 3100 feet in the altitude select and continued our current descent. As the airplane began to level at the selected altitude and with visual confirmation made that we would clear terrain ahead and below the aircraft; we received a GPWS (ground proximity warning system) warning for terrain. The terrain was detected before the GPWS warning. Terrain below the aircraft caused a GPWS warning even though there was visual contact made with the terrain. The autopilot was disengaged in order to react to the GPWS warning but the warning went away immediately after the autopilot was disconnected. Delaying the descent until after passing the terrain would have prevented a warning.

Original NASA ASRS Text

Title: EMB 145LR First Officer reported triggered Ground Proximity Warning System during visual approach.

Narrative: After being cleared for the visual approach I set 3100 feet in the altitude select and continued our current descent. As the airplane began to level at the selected altitude and with visual confirmation made that we would clear terrain ahead and below the aircraft; we received a GPWS (Ground Proximity Warning System) warning for terrain. The terrain was detected before the GPWS warning. Terrain below the aircraft caused a GPWS warning even though there was visual contact made with the terrain. The autopilot was disengaged in order to react to the GPWS warning but the warning went away immediately after the autopilot was disconnected. Delaying the descent until after passing the terrain would have prevented a warning.

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.