Cpr medium large transport flight crew landed without clearance due to the first officer becoming distraction by the captain, and did not retune the communication radio to the tower frequency when advised by approach control.

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Attributes
ACN	350310
Time
Date	199610
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : san
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 1800
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : san tower : cos
Operator	general aviation : corporate
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Navigation In Use	Other Other
Flight Phase	descent : approach landing other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 82 flight time total : 5000 flight time type : 750
ASRS Report	350310
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : far non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During approach into san, ca, approach control gave us a frequency change to tower frequency 118.3 at about 12.4 DME on the localizer. There's a stepdown to the next lower altitude at this point. The PF asked me about the DME or the stepdown altitude at about the same time as the frequency change from approach. I responded to the PF with the information asked for, but forgot to change the frequency to tower. We continued down the approach and landed before I realized I did not switch to the tower frequency. I think if one of us would have asked, 'are we cleared to land?' this would have jogged our minds to confirm a clearance to land.

Original NASA ASRS Text

Title: CPR MLG FLC LANDED WITHOUT CLRNC DUE TO THE FO BECOMING DISTR BY THE CAPT, AND DID NOT RETUNE THE COM RADIO TO THE TWR FREQ WHEN ADVISED BY APCH CTL.

Narrative: DURING APCH INTO SAN, CA, APCH CTL GAVE US A FREQ CHANGE TO TWR FREQ 118.3 AT ABOUT 12.4 DME ON THE LOC. THERE'S A STEPDOWN TO THE NEXT LOWER ALT AT THIS POINT. THE PF ASKED ME ABOUT THE DME OR THE STEPDOWN ALT AT ABOUT THE SAME TIME AS THE FREQ CHANGE FROM APCH. I RESPONDED TO THE PF WITH THE INFO ASKED FOR, BUT FORGOT TO CHANGE THE FREQ TO TWR. WE CONTINUED DOWN THE APCH AND LANDED BEFORE I REALIZED I DID NOT SWITCH TO THE TWR FREQ. I THINK IF ONE OF US WOULD HAVE ASKED, 'ARE WE CLRED TO LAND?' THIS WOULD HAVE JOGGED OUR MINDS TO CONFIRM A CLRNC TO LAND.

Data retrieved from NASA's ASRS site as of July 2007 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.