Gulfstream IV / G350 / G450
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 144; Flight Crew Total 17756; Flight Crew Type 7752
Confusion; Distraction; Situational Awareness; Training / Qualification
Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued Advisory / Alert; Flight Crew Executed Go Around / Missed Approach; Flight Crew Took Evasive Action
Human Factors
During a flight on GIV; I was the non-flying pilot during the Runway XX instrument approach. I called for missed approach when runway was not seen and a missed approach was executed. Terrain warning system call came when the flying pilot didn't execute the missed approach procedure properly; followed by a warning call from the Tower. We diverted and landed at ZZZ1. My recommendation is for the flying pilot to receive proper training.
Gulfstream IV pilot reported receiving a GPWS warning and a warning from Tower during a missed approach.