Narrative:

For approach and landing at lax the captain was flying, first officer was radio communication, and a relief pilot was on the flight deck. After uneventful landing, we turned off lax runway 25L and held short of runway 25R at intersection M. At that point we received a radio call to hold short of runway 25R, contact tower. One of two possibilities had occurred, and the crew is not sure which. Either we landed without clearance, or after receiving clearance, the first officer, intending to pretune ground control frequency, inadvertently left tower frequency. All checklists and procedures were followed, and there was nothing unusual or rushed about the approach and landing. At 1000 ft AGL first officer called out '1000 ft, instrument xchk.' captain responded 'roger, cleared to land.' I responded, confident that clearance had been received, and in the past I've never been shy about confirming landing clearance. I believe the procedures and callouts contained in SOP are adequate for preventing landing without clearance. I also believe that factors affecting the crew during this flight - - such as fatigue after the 6 day trip, the 12 hour flight, or preoccupation with the drug test we'd been advised to expect after landing -- were not severe enough to explain the event. It seems that one of those events that couldn't happen to me, has. Although it is possible the radio was de-tuned after receipt of clearance, I think that is unlikely. Better to concentrate on preventing landing without clearance, and especially on being sure that clearance has been received before responding to the 1000 ft call. Supplemental information from acn 341180: tower gave us cleared to land, and as I was saying cleared to land, I hit the transfer switch by mistake which put us back on approach frequency.

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Original NASA ASRS Text

Title: PROBABLE LAND WITHOUT CLRNC. ACCORDING TO THE FO, THE FLT WAS CLRED TO LAND AND HE HIT THE TRANSFER SWITCH BY MISTAKE WHEN SETTING IN GND CTL FREQ. AFTER LNDG AND HOLDING SHORT OF RWY, APCH CTLR ADVISED FLC TO CONTACT TWR.

Narrative: FOR APCH AND LNDG AT LAX THE CAPT WAS FLYING, FO WAS RADIO COM, AND A RELIEF PLT WAS ON THE FLT DECK. AFTER UNEVENTFUL LNDG, WE TURNED OFF LAX RWY 25L AND HELD SHORT OF RWY 25R AT INTXN M. AT THAT POINT WE RECEIVED A RADIO CALL TO HOLD SHORT OF RWY 25R, CONTACT TWR. ONE OF TWO POSSIBILITIES HAD OCCURRED, AND THE CREW IS NOT SURE WHICH. EITHER WE LANDED WITHOUT CLRNC, OR AFTER RECEIVING CLRNC, THE FO, INTENDING TO PRETUNE GND CTL FREQ, INADVERTENTLY LEFT TWR FREQ. ALL CHKLISTS AND PROCS WERE FOLLOWED, AND THERE WAS NOTHING UNUSUAL OR RUSHED ABOUT THE APCH AND LNDG. AT 1000 FT AGL FO CALLED OUT '1000 FT, INST XCHK.' CAPT RESPONDED 'ROGER, CLRED TO LAND.' I RESPONDED, CONFIDENT THAT CLRNC HAD BEEN RECEIVED, AND IN THE PAST I'VE NEVER BEEN SHY ABOUT CONFIRMING LNDG CLRNC. I BELIEVE THE PROCS AND CALLOUTS CONTAINED IN SOP ARE ADEQUATE FOR PREVENTING LNDG WITHOUT CLRNC. I ALSO BELIEVE THAT FACTORS AFFECTING THE CREW DURING THIS FLT - - SUCH AS FATIGUE AFTER THE 6 DAY TRIP, THE 12 HR FLT, OR PREOCCUPATION WITH THE DRUG TEST WE'D BEEN ADVISED TO EXPECT AFTER LNDG -- WERE NOT SEVERE ENOUGH TO EXPLAIN THE EVENT. IT SEEMS THAT ONE OF THOSE EVENTS THAT COULDN'T HAPPEN TO ME, HAS. ALTHOUGH IT IS POSSIBLE THE RADIO WAS DE-TUNED AFTER RECEIPT OF CLRNC, I THINK THAT IS UNLIKELY. BETTER TO CONCENTRATE ON PREVENTING LNDG WITHOUT CLRNC, AND ESPECIALLY ON BEING SURE THAT CLRNC HAS BEEN RECEIVED BEFORE RESPONDING TO THE 1000 FT CALL. SUPPLEMENTAL INFO FROM ACN 341180: TWR GAVE US CLRED TO LAND, AND AS I WAS SAYING CLRED TO LAND, I HIT THE TRANSFER SWITCH BY MISTAKE WHICH PUT US BACK ON APCH FREQ.

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.