Air carrier Captain reported encountering gusty winds and wake turbulence from preceding aircraft on approach to LAS; resulting in a low altitude GPWS 'Don't Sink' annunciation. Pilot continued to a normal landing.
Synopsis
Air carrier Captain reported encountering gusty winds and wake turbulence from preceding aircraft on approach to LAS; resulting in a low altitude GPWS 'Don't Sink' annunciation. Pilot continued to a normal landing.
Narrative
I was Captain and Pilot Flying on Aircraft X to LAS. We were following a Company aircraft on final to Runway 1R in LAS with approximately 3 miles separation. Company aircraft was following a business jet with approximately the same separation. As we descended using the RNAV approach; we began to experience light continuous chop; I assumed that it was a combination of wind; wake turbulence and heating off the ground. The approach was uneventful until the business jet missed [the] exit that was directed by Tower and rolled long; causing the rest of us to tighten up separation. The Company aircraft in front of us landed and cleared the runway as we approached 1500 ft or so. I had transitioned to visual and was using the PAPI as guidance; the aircraft was experiencing up drafts as well as gusts and perhaps wake turbulence. However; it was easily controlled with normal flight control inputs. Over the runway and inside of 100 ft there was the aural warning of 'Don't Sink'; everything appeared normal; and I continued. We didn't not go around nor did either one of us verbally verify the caution. The touchdown and roll out were normal and uneventful.
Second reporter narrative
LAS changed runway on arrival due to gusty winds creating out of limit tailwind for previous runway. On final to Runway 1R; winds were gusty approximately 050 10 G 20. Approaching the runway; gusts and turbulence were pushing the aircraft above the PAPI glide slope. Captain (PF) was making corrections to resume glide path. Due to turbulence and the downward vector of the aircraft to resume glide path; the sink rate momentarily touched 1200 down and the GPWS 'sink rate' caution sounded; this was approximately 100 ft AGL PF was already applying a correction. Neither Pilot called for a go-around (possibly due to startle factor) and the fact that a correction was already in progress. Aircraft touched down in the touchdown zone normally and turn off was made.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.