Narrative:

During a very long day; (12.5 hours of duty; almost 8 hours of scheduled block; and at least 6 separate calls to maintenance through the day); we had an extremely busy approach in less than ideal weather; visual; but moderate turbulence and winds gusting at 28+ knots; ca (captain) took the controls to salvage and stabilize an approach to runway 30 at about a 4 mile left base. While this exchange was going on and we were getting tossed around; we were given our handoff to tower but failed to make the switch. In the flare at about 40 ft.; we hear over radio 'aircraft X call tower'. The first officer immediately switched frequency and made a call; but it was incidentally the wrong frequency and we landed. We immediately called tower as we pulled off the runway and were given a subsequent taxi clearance.task saturation; extreme winds/weather; original pilot flying misjudged distance to runway. We briefed the approach on the ground and rebriefed it again in flight and ca stressed multiple times the severity of the approach into mso; first officer (first officer) fell behind the aircraft leading to the control swap at critical stage of the approach. Rote response due to saturation for '500 to go' call out.stricter attention to position of light switches and to SOP (standard operating procedure) required callouts for landing. Maybe make mso a captain only airport; even the visuals in there are difficult sometimes.

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Original NASA ASRS Text

Title: Flight crew reported landing without clearance.

Narrative: During a very long day; (12.5 hours of duty; almost 8 hours of scheduled block; and at least 6 separate calls to maintenance through the day); we had an extremely busy approach in less than ideal weather; visual; but moderate turbulence and winds gusting at 28+ knots; CA (Captain) took the controls to salvage and stabilize an approach to Runway 30 at about a 4 mile left base. While this exchange was going on and we were getting tossed around; we were given our handoff to Tower but failed to make the switch. In the flare at about 40 ft.; we hear over radio 'Aircraft X call Tower'. The First Officer immediately switched frequency and made a call; but it was incidentally the wrong frequency and we landed. We immediately called Tower as we pulled off the runway and were given a subsequent taxi clearance.Task Saturation; extreme winds/weather; original Pilot Flying misjudged distance to runway. We briefed the approach on the ground and rebriefed it again in flight and CA stressed multiple times the severity of the approach into MSO; FO (First officer) fell behind the aircraft leading to the control swap at critical stage of the approach. Rote response due to saturation for '500 to go' call out.Stricter attention to position of light switches and to SOP (Standard Operating Procedure) required callouts for landing. Maybe make MSO a captain only airport; even the visuals in there are difficult sometimes.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.