Medium Transport; Low Wing; 2 Turbojet Eng
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Fatigue; Situational Awareness
Deviation - Altitude Undershoot; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Flight Crew Took Evasive Action
Human Factors
We were doing a late night flight to Evansville on the visual approach for Runway 22 and the FO (First Officer) (Pilot Flying) drifted below the glide slope as he went to full visual not cross referencing a glide slope. I told him he was sinking below it and about that time we received the glide slope warning as he was correcting. Pilot Monitoring stated the Pilot Flying was too low and below the glide slope while shortly after the glide slope GPWS went off.I believe the cause of this was improper scan of the Pilot Flying while transitioning to the visual part of the approach and also it being late at night and being tired on the last leg of the day.The Pilot Flying climbed the airplane back on to glide slope and proceeded with the visual approach and a good landing.Keep a continuous scan in and out of the cockpit while on a visual approach; especially when there are no PAPIs.
While hand flying the approach around 500 ft. to Runway 22 in Evansville; I allowed the aircraft to drift below glide slope. The Captain; who was PM (Pilot Monitoring) noticed and informed me I was getting low. I also received a 'glide slope' aural warning. I quickly corrected pitch and power to get back on glide slope and landed without any further issues. The Captain informed me I was getting low; and the 'glide slope' GPWS aural alert. I believe the cause was my insufficient scan of the flight instruments; as well as transitioning from the glide slope to scan the runway environment. Since it was nighttime; and since Runway 22 in Evansville has no VASI or PAPI; I believe my sight picture was incorrect; and I judged the aircraft to be higher than it was. I corrected pitch and power and returned to the glide slope for a normal landing. I believe I can do a better job of scanning the flight and navigation instruments while on approach; especially to an airport with no VASI or PAPI.
Air carrier flight crew reported the pilot flying drifted below the glideslope on visual approach resulting in a GPWS alert and evasive action.