Beechjet 400
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 100; Flight Crew Total 23000; Flight Crew Type 120
Confusion; Human-Machine Interface; Situational Awareness
Deviation - Altitude Overshoot; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Flight Crew Became Reoriented
Airspace Structure; Chart Or Publication; Human Factors
On VFR visual approach to Runway XXL at ZZZ; Second in Command (myself) was in communication with another flight which had just landed on Runway XXR.  Pilot in command in left seat was pilot flying and I was pilot monitoring.  Our selected course was direct to ZZZZZ for a GPS approach. Passing approximately 4;500 feet for selected altitude of 4;100 feet a 'terrain' advisory sounded.  Descent was arrested and we temporarily returned to 4;500 feet.   No further warnings; remainder of the flight was uneventful.  I figured out that we were northeast of a mountain peak; whose highest obstacle is an antenna at 3;600 feet.  Our lowest altitude above ground level was estimated 1;500 feet.
BE400 pilot reported that while descending on a Visual Approach they received a Terrain Alert.