A B737 flight crew is uncertain if they received a landing clearance.

Attributes
ACN	524770
Time
Date	200103
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : phx.airport
State Reference	AZ
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Flight Phase	landing : roll
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 5000 flight time type : 250
ASRS Report	524770
Events
Anomaly	incursion : landing without clearance non adherence : clearance non adherence : far
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

ATC changed runways from runway 25R for the visual on runway 26L. Workload got heavy and we landed on runway 26, possibly without being cleared to land. I cannot remember if we did or did not contact the tower.

Original NASA ASRS Text

Title: A B737 FLT CREW IS UNCERTAIN IF THEY RECEIVED A LNDG CLRNC.

Narrative: ATC CHANGED RWYS FROM RWY 25R FOR THE VISUAL ON RWY 26L. WORKLOAD GOT HVY AND WE LANDED ON RWY 26, POSSIBLY WITHOUT BEING CLRED TO LAND. I CANNOT REMEMBER IF WE DID OR DID NOT CONTACT THE TWR.

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.