Flight Crew Air Transport Pilot (ATP)
Situational Awareness; Fatigue
ATC Issue All Types; Deviation / Discrepancy - Procedural Landing Without Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance; Flight Crew Became Reoriented
Human Factors
I landed without clearance. We landed on Approach Control frequency. While clearing runway I realized we were still on Approach Control frequency. I heard transmissions that sounded like what an Approach Controller would say - not Tower. I asked my partner 'were we cleared to land?' My partner quickly switched to Tower and we heard him clearing us to cross parallel runway and contact Ground. we acknowledged and complied. Tower Controller then said he tried to call us a couple of times. My partner told him that Approach Control never switched us over. The last thing I remember on approach was the Approach Controller issuing us traffic over the stadium; that was it. I do not recall ever being told to contact the Tower. We were also at the end of two very long days dealing with multiple issues and worn down. in this mental state I was not sharp enough to switch to Tower on my own past the marker without being prompted to do so by ATC. It was quiet and smooth. So many approaches and landings in the last four days - it is hard to keep track because they start running together being so automatic. We were fatigued towards the end of this flight. After listening to LIVEATC.com it sounds like we were forgotten about. The Tower asked us where we were parking close to a short final; queried us again; and then again and issued the taxi instructions. Which is when we switched over and heard them. It does not seem as though they were looking for us long. I take full responsibility for landing without a clearance. I always wondered how you could land without a clearance and now I know. Contributing factors were crew fatigue and lack of ATC Comm. Normally I would query ATC about switching to Tower; or just switch myself past the marker if they are busy; but due to fatigue I did not catch it and we continued. To help prevent this in the future I will monitor my fatigue level better.
Captain reported landing without clearance; citing fatigue as contributing.