Flight crew of B737-300 may have landed at atl without landing clearance.

Attributes
ACN	579084
Time
Date	200304
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : atl.airport
State Reference	GA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : a80.tracon
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	landing : roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : atp pilot : multi engine pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 20000 flight time type : 5000
ASRS Report	579084
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	incursion : landing without clearance non adherence : company policies non adherence : clearance non adherence : far
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance Environmental Factor Airport ATC Human Performance
Primary Problem	Environmental Factor
Air Traffic Incident	Pilot Deviation

Narrative:

Atl approach control had been very busy on radio -- cleared us for visual approach behind another aircraft. They seemed to switch us to the tower late -- the tower was very busy. The tower was stepped on many times as were we -- we happened to hear tower 'air carrier XXX.' we heard 'cleared to land.' no problem with other aircraft existed, just bad radio communication.

Original NASA ASRS Text

Title: FLT CREW OF B737-300 MAY HAVE LANDED AT ATL WITHOUT LNDG CLRNC.

Narrative: ATL APCH CTL HAD BEEN VERY BUSY ON RADIO -- CLRED US FOR VISUAL APCH BEHIND ANOTHER ACFT. THEY SEEMED TO SWITCH US TO THE TWR LATE -- THE TWR WAS VERY BUSY. THE TWR WAS STEPPED ON MANY TIMES AS WERE WE -- WE HAPPENED TO HEAR TWR 'ACR XXX.' WE HEARD 'CLRED TO LAND.' NO PROB WITH OTHER ACFT EXISTED, JUST BAD RADIO COM.

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.