Workload; Confusion; Distraction; Communication Breakdown; Time Pressure; Human-Machine Interface; Situational Awareness
ATC Issue All Types; Deviation - Altitude Overshoot; Deviation - Altitude Crossing Restriction Not Met; Deviation - Speed All Types; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Other / Unknown
Air Traffic Control Issued New Clearance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Became Reoriented
Airport; Weather; Procedure; Human Factors
Approaching DEN 150 NM out working around weather on the JAGGR 3 Arrival. Got vectors; then the WAHUU 2 Arrival; told to descend via ending at 9;000 feet; and then vectors. No altitude given and had to question altitude. Told 13;000 feet after going through it. Then told to hold 12;000 feet. Earlier using Runway 34/35 and now 16s and 17s. I was flying and complying with ATC speed and headings. First Officer (FO) tried to keep up with FMC changes. Getting closer given and given direct PIEKE and then direct PUFFR. Then given heading 120; intercept LOC 17R. All okay. Then given to slow to 210 direct HISSY and maintain 12;000 feet. HISSY is not in the FMC and this led to the distraction of telling and checking FOs entry of HISSY. Speedbrake was out to slow. Now 12;000 feet. Level and got airspeed low warning. Corrected immediately. Believe we crossed HISSY at 12;000 feet. Then; we completed stable ILS approach.
An air carrier crew was issued multiple arrival STARs and runway assignments during descent into DEN resulting in a very high work load and a momentary low speed alert with the speedbrake extended.