Commercial Fixed Wing
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Fatigue; Human-Machine Interface
Inflight Event / Encounter Unstabilized Approach; Inflight Event / Encounter CFTT / CFIT
Flight Crew Became Reoriented; Flight Crew Took Evasive Action
Human Factors; Weather
On approach at night visual to Runway 26 in the Jacksonville. I was the pilot monitoring with the first officer as the flying pilot. We were given a visual approach and he [turned] off the auto pilot at approximately 1;000 feet. At the 500 feet call he was stable; I don't recall the exact altitude after 500 feet as I was heads up looking outside and I noticed three red and one white on the PAPI. I did observe he was getting low on the glideslope. We had the ILS backed up and when I looked up; I saw four red and instructed him ' four reds; level off' we also received the oral warning glideslope at the same time. He did respond and leveled off approximately two to three seconds later and I saw the three red one white again. Landing was uneventful.It is also worth noting that we were into a 13 hour duty day due to weather delays and rescheduling.Also; worth noting was both Approach Control and Tower stated that they were receiving PIREPs of 40 knot headwinds until a 4 mile final. In actuality the winds were gusting up to 40 all the way to about a 1 mile final.
Air carrier Captain reported that while the First officer was hand-flying a visual approach; they descended below glide slope and observed four red lights on the PAPI. The crew leveled off and continued to landing.